Document:

US$__________	 	Note
    No. 
	Issue
    Date: _________	 	Maturity
    Date: __________________

 

PROLUNG,
INC.

 

EIGHT
PERCENT (8%) CONVERTIBLE NOTE

 

THIS
NOTE, AND THE SHARES OF COMMON STOCK ISSUABLE UPON CONVERSION OF THIS NOTE, HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT
OF 1933, AS AMENDED (THE “1933 ACT”), OR UNDER THE SECURITIES LAWS OF ANY STATE. THESE SECURITIES HAVE BEEN ACQUIRED
FOR INVESTMENT AND MAY NOT BE TRANSFERRED OR SOLD IN THE ABSENCE OF AN EFFECTIVE REGISTRATION OR OTHER COMPLIANCE UNDER THE 1933
ACT OR THE LAWS OF THE APPLICABLE STATE OR A “NO ACTION” OR INTERPRETIVE LETTER FROM THE SECURITIES AND EXCHANGE COMMISSION
OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE ISSUER, AND ITS COUNSEL, TO THE EFFECT THAT THE SALE OR TRANSFER IS EXEMPT
FROM REGISTRATION UNDER THE 1933 ACT AND SUCH STATE STATUTES.

 

This
Eight Percent (8%) Convertible Note (the “Note”) is a duly authorized issue of an Eight Percent (8%) Convertible Notes
of ProLung, Inc., a Delaware corporation (the “Company”). This Note is issued in part pursuant to and in accordance
with the exemption from securities registration afforded by Section 4(a)(2) of, and/or Regulation D promulgated under, the Securities
Act of 1933, as amended (the “1933 Act”)

 

FOR
VALUE RECEIVED, the Company promises to pay to __________________________or the permitted registered holder hereof (the “Holder”),
the principal sum of US$____________ _____________), as adjustment for partial prepayments and similar events (the “Principal
Amount”), plus accrued but unpaid interest on the Principal Amount. The Maturity Date of the Note is the earlier to occur
of (a) second anniversary of the Issue Date first set forth above, which Issue Date shall correspond to the date (i) the initial
Holder had paid the purchase price for the Note, and (ii) the Company had accepted the subscription of the initial Holder, and
(b) the closing of any transaction in which substantially all of the business and assets of the Company have been acquired by
another person, whether structured as an asset purchase, merger or secondary stock purchase, except to the extent that stockholders
of the Company prior to such transaction own a majority of the outstanding capital stock of the acquiring person (or parent of
the acquiring person) following such transaction.

 

Interest
shall accrue from the Issue Date upon the Principal Amount at the rate of eight percent (8%) per annum based upon a 365-day year.
The Principal Amount of, and accrued interest under, this Note is payable in U.S. dollars at the address last appearing on the
Note Register of the Company as designated in writing by the Holder in the Holder’s subscription documents, as this may
be updated from time to time.

 

At
maturity of the Note, the Company will pay in full all principal and accrued but unpaid interest on the Note. All or any portion
of this Note may be prepaid without penalty upon ten (10) days advanced written notice by the Company. Prepayments shall be applied
first to accrued but unpaid interest and second to the Principal Amount. If the maturity date is due to closing of any transaction
in which substantially all of the business and assets of the Company have been acquired by another person, whether structured
as an asset purchase, merger or secondary stock purchase repayment will be under the Mandatory Conversion provisions mentioned
below at 1(b).

 

    	1

     

    

 

The
forwarding of a check shall constitute a payment of principal and interest hereunder and shall satisfy and discharge the liability
for principal and interest on this Note to the extent of the sum represented by such check.

 

This
Note is subject to the following additional provisions:

 

1.
       Conversion of Notes.

 

a.       Optional
Conversion. The Holder of this Note is entitled, at its option, to convert all, but not less than all, of the Principal Amount
into shares of common stock of the Company (an “Optional Conversion”) at a conversion price for each share of common
stock equal to Six Dollars and Thirty Cents ($6.30) (as equitably adjusted to reflect subsequent stock dividends, stock splits,
combinations or recapitalizations, the “Conversion Price”). In connection with an Optional Conversion, the notice
of conversion in the form attached hereto as Exhibit A (the “Notice of Conversion”) completed and executed
by the Holder evidencing such Holder’s intention to convert the Note must be given to the Company as provided below not
less than thirty (30) days prior to the Maturity Date. A conversion pursuant to this Section 1.a shall be referred to as an “Optional
Conversion.”

 

b.       Mandatory
Conversion. If at any time prior to the Maturity Date, the Company completes an initial registered public offering (“IPO”)
of its common stock, all unpaid Principal Amount and accrued but unpaid interest shall, without any action on the part of the
Holder, automatically be converted into common stock of the Company at a conversion price for each share of common stock equal
to the lower of (i) the Conversion Price, and (ii) 90% of the price at which shares are sold to the public in the IPO. A conversion
pursuant to this Section 1.b shall be referred to as a “Mandatory Conversion.”

 

Conversion
Mechanics. In connection with any Optional Conversion or Mandatory Conversion, the number of shares of common stock to be
issued shall be determined by dividing (i) the sum of the Principal Amount of the Note plus accrued but unpaid interest, by (ii)
the applicable conversion price. Conversion of this Note into shares of common stock in an Optional Conversion shall be affected
by surrendering the Note to be converted to the Company, together with a Notice of Conversion. The effective date of any Optional
Conversion hereunder shall be the date this Note and such Notice of Conversion are both received by the Company, whether by personal
delivery, mail or express courier, in each case addressed to the Chief Executive Officer of the Company at the address of the
Company. In connection with a Mandatory Conversion, the Note will be deemed to have been converted as of the closing of the IPO;
provided however, the Company will not issue the shares issuable upon such conversion until the original Note has been surrendered
to the Company.

 

Issuance
of Shares; Fractional Shares. Upon conversion of the Note, the Company shall issue within the five (5) business days of the
date the original Note (and the Notice of Conversion in connection with an Optional Conversion) has been surrendered to the Company
(the “Deadline”), deliver to or upon the order of the Holder one or more certificates (the “Certificates”)
representing that number of shares of shares of common stock into which the Note converted, as shall be determined in accordance
herewith. No fractional shares or scrip representing fractions of shares of shares of common stock will be issued on conversion,
but the number of shares of common stock issuable shall be rounded to the nearest whole share (with .5 or greater being rounded
up and less than .5 rounded down). Except as permitted under Section 4(a)(1) under the 1933 Act, as a result of the application
of Rule 144 promulgated thereunder (“Rule 144”), shares of common stock issued upon the conversion of this Note Payable
shall be issued with the following, or a comparable, legend:

 

    	2

     

    

 

THE
SECURITIES REPRESENTED BY THIS INSTRUMENT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AND HAVE BEEN ACQUIRED FOR
INVESTMENT AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF. NO SUCH TRANSFER MAY BE EFFECTED WITHOUT
AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION OF COUNSEL IN A FORM SATISFACTORY TO THE COMPANY THAT SUCH REGISTRATION
IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS AMENDED.

 

2.       Waiver
of Demand and Presentment. The Company hereby expressly waives demand and presentment for payment, notice of nonpayment, protest,
notice of dishonor, notice of acceleration or intent to accelerate, bringing of suit and diligence in taking any action to collect
amounts called for hereunder and shall be directly and primarily liable for the payment of all sums owing and to be owing hereon,
regardless of and without notice, diligence, act or omission as or with respect to the collection of any amount called for hereunder.

 

3.       Payment
of Costs. If one or more of the “Events of Default” as described in Paragraph 4 shall occur, the Company agrees
to pay all costs and expenses, including reasonable attorney’s fees, which may reasonably be incurred by the Holder in collecting
amount due under, or enforcing any terms of, this Note.

 

4.       Events
of Default. If more than one of the following described “Events of Default” shall occur:

 

(a)
The Company shall default in the timely payment of principal or interest; or

 

(b)
Any of the representations or warranties made by the Company herein, or in any certificate or financial or other document heretofore
furnished by or on behalf of the Company in connection with the execution and delivery of this Note, shall be false or misleading
any material respect at the time made; or

 

(c)
The Company shall fail to perform or observe any other covenant, provision, condition, agreement or obligation of the Company
under this Note and such failure shall continue uncured for a period of thirty (30) days after notice from the Holder of such
failure; or

 

(d)
The Company shall (i) admit in writing its inability to pay its debts as they mature; (ii) make an assignment for the benefit
of creditors or commence proceedings for its dissolution; or (iii) apply for or consent to the appointment of a trustee, liquidator
or receiver for it or for a substantial part of its property or business; or

 

(e)
A trustee, liquidator or receiver shall be appointed for the Company or for a substantial part of its property or business without
its consent and shall not be discharged within thirty (30) days after such appointment; or

 

(f)
Any governmental agency or any court of competent jurisdiction at the instance of any governmental agency shall assume custody
or control of the whole or any substantial portion of the properties or assets of the Company and shall not be dismissed within
thirty (30) days thereafter; or

 

    	3

     

    

 

(g)
Bankruptcy, reorganization, insolvency or liquidation proceedings or other proceedings for relief under any bankruptcy law or
any law for the relief of debtors shall be instituted by or against the Company and if instituted against the Company, shall not
be dismissed, stayed or bonded within sixty (60) days after such institution or the Company shall by any action or answer approve
of, consent to, or acquiesce in any such proceedings or admit the material allegations of, or default in answering a petition
filed in any such proceeding;

 

Then,
or at any time thereafter, and in each and in every such case, unless such Event of Default shall have been waived in writing
by the Holder (which waiver shall not be deemed to be a waiver of any subsequent default), the Holder may consider this Note immediately
due or payable, without presentment, demand, protest or notice of any kind, all of which are expressly waived, anything herein
or in any Note or other instruments contained to the contrary notwithstanding, and the Holder may immediately demand without expiration
of any period of grace, enforce any and all of the Holder’s rights and remedies provided herein or any other rights or remedies
afforded by law.

 

5.       Conversion
Requirements. Notwithstanding anything to the contrary contained herein, and in addition to any other requirements reasonably
requested by the Company to comply with state of federal securities laws, each Notice of Conversion shall contain representations
to the effect that (i) the Holder is an “accredited investor” as such term is
defined in Rule 501(a) of Regulation D promulgated by the SEC under the 1933 Act, and (ii) the Conversion Shares are being acquired
for the Holder’s own account and not as a nominee for any other party.

 

6.       Transfer
Restrictions. The Holder may, subject to compliance with the registration requirements of the 1933 Act, or exemptions therefrom,
transfer, assign, mortgage or encumber this Note, any interest herein or any part hereof in minimum amount of $25,000 or the entire
outstanding balance to an “accredited investor” as defined in the 1933 Act that will be acquiring the Note or interest
herein for its account for the purpose of investment and not with a view to or for sale in connection with any distribution hereof
and, each assignee, transferee or mortgage (which may include any affiliate of the Holder) shall have the right to transfer or
assign its interest subject to the same limitations. Each such assignee, transferee and mortgagee shall have all of the rights
of the Holder under this Note. The Company may condition registrations of transfers on the receipt of (a) satisfactory evidence
of compliance with the 1933 Act, and (b) a certificate from the assignee, transferee of mortgagee in a form acceptable to the
Company that contains representations and warranties similar to those of the Holder contained in the Subscription Agreement and/or
as required under Rule 144 under the 1933 Act, and IRS Form W-9 or an equivalent certification under penalty of perjury in compliance
with the Internal Revenue Code of 1986, as amended from time to time.

 

7.       Covenants
of the Company. The Company covenants that until all amounts due under this Note have been paid in full, by conversion or
otherwise, unless the Holder or subsequent Holder waives compliance in writing, the Company shall:

 

(a)
give prompt written notice to the Holder of any Event of Default;

 

(b)
at all times reserve and keep available out of its authorized but unissued restricted common stock, for the purpose of effecting
the conversion of this Note into shares of common stock, such number of its duly authorized shares of shares of common stock as
shall from time to time be sufficient to effect the conversion of the Principal Amount of this Note into shares of common stock.

 

    	4

     

    

 

(c)
Upon receipt by the Company of evidence from the Holder reasonably satisfactory to the Company of the loss, theft, destruction
or mutilation of this Note,

 

(i)      
in the case of loss, theft or destruction, upon provision of indemnity reasonably satisfactory to it and/or its transfer agent,
or

 

(ii)       in
the case of mutilation, upon surrender and cancellation of this Note, then the Company at its expense will execute and deliver
to the Holder a new Note, dated the date of the lost, stolen, destroyed or mutilated Note, and evidencing the outstanding and
unpaid principal amount of the lost, stolen, destroyed or mutilated Note.

 

8.       Partial
Invalidity. In the case any provision of this Note is held by a court of competent jurisdiction to be excessive in scope or
otherwise invalid or unenforceable, such provision shall be adjusted rather than voided, if possible, so that its enforceable
to the maximum extent possible, and the validity and enforceability of the remaining provisions of this Note will not in any way
be affected impaired thereby.

 

9.       Governing
Law. This Note and all matters arising directly or indirectly here from shall be governed by and construed in accordance
with the laws of the State of Utah as to matters within the scope thereof, and as to all other matters shall be governed by and
construed in accordance with the internal laws of the State of Utah, without regard to its principles of conflicts of laws.

 

10.       Notices.
All notices required or permitted hereunder shall be in writing and shall be deemed effectively given: (a) upon personal delivery
to the party to be notified, (b) when sent by confirmed electronic mail or facsimile if sent during normal business hours of the
recipient, if not, then on the next business day, (c) five days after having been sent by registered or certified mail, return
receipt requested, postage prepaid, or (d) one business day after deposit with a nationally recognized overnight courier, specifying
next day delivery, with written verification of receipt. All communications shall be sent to the Company at the address on the
signature page below, and to Holder at the addresses set forth on the signature page to the Note Purchase Agreement to which the
Holder is a party or at such other addresses as the Company or Holder may designate by 10 days advance written notice to the other
parties hereto.

 

11.       Jurisdiction.
The parties (a) hereby irrevocably and unconditionally submit to the sole and exclusive jurisdiction of the state and federal
courts located in Salt Lake County in the State of Utah for the purpose of any suit, action or other proceeding arising out of
or based upon this Note or the Note (“Covered Matters”), (b) agree not to commence any suit, action or other proceeding
arising out of or based upon any Covered Matters except in the state courts or federal courts located in the State of Utah, and
(c) hereby waive, and agree not to assert, by way of motion, as a defense, or otherwise, in any such suit, action or proceeding,
any claim that it is not subject personally to the jurisdiction of the above-named courts, that its property is exempt or immune
from attachment or execution, that the suit, action or proceeding is brought in an inconvenient forum, that the venue of the suit,
action or proceeding is improper or that this Note or the subject matter of any Covered Matter may not be enforced in or by such
court.

 

    	5

     

    

 

12.       Registration
Rights. If at any time after the effective date of the first registration statement (other than a Form S-8 registration statement)
for a public offering of the Company’s securities under the 1933 Act, the Company receives a request from Holder (or the
holder of another note issued in the same offering as the Note, with such notes, combined with this Note, being the “Offering
Notes”) requesting that the Registrable Securities be registered for resale under the 1933 Act, the Company shall promptly
provide notice to all holders of Registrable Securities and as soon as practicable and file, and cause to be effective for a period
of not less than 180 days, a Form S-1 registration statement (or Form S-3 registration statement if available for the transaction)
under the 1933 Act covering all Registrable Securities that holders of the Offering Notes request to be included in such registration
(as specified by notice given by each such holder to the Company within 20 days of the date the Company gives notice to the holders
of Registrable Securities of the proposed registration), subject to the following: (a) the Company will not be required to file
a registration statement at any time it is prohibited under the underwriting agreement associated with the Company’s first
registration statement (other than a Form S-8 registration statement) for a public offering of the Company’s securities,
and (b) this Section 12 shall expire upon the effective date of the first registration statement filed under this Section 12 (and/or
Section 12 of other Offering Notes). “Registrable Securities” means (i) the “Conversion Shares” under
each of the Offering Notes, and (ii) any of the Company’s shares of stock issued as (or issuable upon the conversion or
exercise of any warrant, right or other security that is issued as) a dividend or other distribution with respect to, or in exchange
for, or in replacement of, the Conversion Shares under each of the Offering Notes; provided, however, that Registrable Securities
will not include any shares of common stock or other securities which have previously been registered under the 1933 Act, which
have been sold to the public either pursuant to a registration statement or Rule 144 or which may be resold under Rule 144 without
any volume or manner of sale restrictions.

 

[intentionally
left blank; signature page follows]

 

    	6

     

    

 

IN
WITNESS WHEREOF, the Company has caused this Eight Percent (8%) Convertible Note to be duly executed by an officer thereunto duly
authorized.

 

	Dated
    as of the Issue Date	ProLung,
    Inc.
	 	 	 
	 	By	/s/
    Steven C. Eror
	 	 	Steven
    C. Eror
	 	 	President
    and Chief Executive Officer

 

    	7

     

    

 

EXHIBIT
A

TO

EIGHT
PERCENT (8%) CONVERTIBLE NOTE

 

NOTICE
OF CONVERSION

 

(To
Be Executed by the Registered Holder in Order to Convert the Note)

 

The
Undersigned hereby irrevocably elects to convert all of the Eight Percent (8%) Convertible Note, No. ____________, into shares
of common stock of ProLung, Inc. (the “Company”), according to the terms and conditions set forth in the Note, as
of the date written below. If securities are to be issued to a person other than the Undersigned, the Undersigned agrees to pay
all applicable transfer taxes with respect thereto.

 

The
Undersigned represents that it, as of this date, is an “accredited investor” as such term is defined in Rule 501(a)
of Regulation D promulgated by the SEC under the 1933 Act.

 

The
Undersigned also represents that the Conversion Shares are being acquired for the Holder’s own account and not as a nominee
for any other party. The Undersigned represents and warrants that all offers and sales by the Undersigned of the Conversion Shares
shall be made pursuant to either an effective registration statement or an exemption from registration under the 1933 Act. 

 

	Conversion
    Date*:	 	 

 

Holder
(Print True Legal Name): 

 

	 	 
	(Signature
    of Duly Authorized Representative of Holder)	 

 

	Address
    of Holder:	 	 

	                               	 	 

	                               	 	 

 

*
This Notice of Conversion (whether by facsimile or otherwise as permitted in the Note) must be received by the Company by the
first business day following the Conversion Date and at least thirty (30) days prior to the Maturity Date of the Note.

 

    	8CONFIDENTIAL

 

February
27, 2018

 

Weild
& Co.

777 29th Street

Suite
402

Boulder,
CO 80303 USA

 

Attention:
David Weild IV, CEO

 

Dear
David:

 

This
letter agreement (this “Agreement”) confirms our understanding with respect to our engagement of Weild &
Co., Inc., a Delaware corporation, through its subsidiary broker/dealer Weild Capital, LLC (collectively, the “Agent”)
to serve as exclusive “Placement Agent” with respect to the matters set forth herein to ProLung, Inc., a Delaware
corporation (the “Company”) for a period of 90 days commencing the date of acceptance of this Agreement (“Term”)
unless otherwise terminated. 

 

1.
       SERVICES.

 

Agent
is hereby appointed as Placement Agent to the Company the sale of up to $3,000,000 aggregate principal amount of convertible promissory
notes of the Company (the “Convertible Notes”) (and may also include the sale of over-subscriptions of the
Convertible Notes in amounts agreed by the Company and Agent and other debt or equity issues of the Company) to one or more Accredited
Investors (as such term is defined in Rule 501 of Regulation D under the Securities Act), including existing stockholders of the
Company.

 

(a)       Services.
In connection with the proposed financing transaction, Agent will provide services that shall include, but not be limited to,
the following:

 

	 	●	Introduce
    the Company’s investment opportunity to prospective investors, including existing stockholders of the Company;
	 	 	 
	 	●	Arrange
    meetings for the Company as needed to secure investment commitments; 
	 	 	 
	 	●	Facilitate
    negotiations with investors or investor groups;
	 	 	 
	 	●	Distribute
    to prospective investors current copies of offering documents provided by the Company, including term sheets, suitability
    questionnaires, subscription agreements, and related agreements, including supplements and amendments to each of the foregoing
    as may be produced or provided by the Company (the “Offering Documents”);
	 	 	 
	 	●	Assist
    with preparation of the Offering Documents and other documentation as necessary; and
	 	 	 
	 	●	Perform
    any such other placement agent services as may be appropriate.  

 

(b)       Authorizing
Resolutions and Amendments. As necessary or appropriate, the Company’s Board of Directors shall adopt resolutions authorizing
the issuance of the Convertible Notes, and the Company’s Certificate of Incorporation and Bylaws shall be amended, if needed,
to authorize a number of shares sufficient to permit conversion shares of common stock of the Company. Other terms of the offering
will be subject to negotiation between the Company and prospective investors and are subject to approval by the Company. 

 

    	 

     

    

 

ProLung,
Inc.

February 27,
2018

Page | 2

 

(c)       General
Solicitation. Company and Agent agree that any such private equity offering will not be made pursuant to Rule 506(b) of Regulation
D under the Securities Act of 1933, as amended (the “Securities Act”). In that regard, Company and Agent agree
not to offer or sell any Securities by means of any form of general solicitation or general advertising. 

 

(d)       Best
Efforts Offering. The Placement Agent shall only be obligated to assist the Company with the sale of the Convertible Notes
(“Securities”) on a “best efforts” basis for the Term of this Agreement (subject to provisions
described in the Offering Documents), as described above. The Securities may only be offered in jurisdictions in which the Placement
Agent or its sub placement agents are duly licensed and authorized to conduct business as broker/dealer(s) in securities or are
exempt from registration therefrom in connection with the activities contemplated in this letter.

 

(e)       Acknowledgment
and Waiver. The Company hereby acknowledges and agrees that Agent’s relationships with, and fiduciary duties in favor
of, the prospective investors require Agent to perform certain advisory services for the purpose of protecting the interests of
such prospective investors. The Company hereby waives any conflict or objection to Agent performing such advisory services as
may be required at the sole determination of Agent.

 

(f)       Proprietary
Information. The Company hereby acknowledges and agrees that (i) the names and contact data of prospective investors originally
introduced by Agent is proprietary information of Agent, and (ii) such proprietary information shall not be shared with any third
party except (y) as required by law, or (z) under written non-disclosure agreement and written consent of Agent. 

 

2.       COMPENSATION.

 

As
compensation for acting as placement agent to the Company hereunder, Agent shall be entitled to receive success fees and reimbursement
of expenses, as described below.

 

(a)       Contingent
Placement Fees. In the event the Company closes one or more sales of Convertible Notes during the Term or Tail Period,
the Company shall (i) pay to Agent a cash placement fee equal to ten percent (10%) of the value of the Convertible Notes, and
upon the conversion of such notes (ii) issue to Agent common stock purchase warrants (the “Warrants”) to purchase
ten percent (10%) of the potential conversion shares of stock associated with the Convertible Notes issued by the Company (the
“Share Awards”). Warrants issued to Agent shall include an exercise price equal to 100% of the price per share
of the most recent sale of equity securities by the Company, expiration after five years from issuance, and standard provisions
for cashless exercise, anti-dilution for stock splits and dividends, division, transferability and “piggyback” registration
rights for any offering other than the initial public offering of the Company.

 

(b)       Payment
and Delivery. All fees payable to Agent pursuant to Section 2(a) shall be (i) payable in cash, by wire transfer of
immediately available funds to an account designated by Agent and (ii) due and payable within ten (10) days following the consummation
of a Financing Transaction and any related transaction thereto. Aggregate Share Awards required to be issued to Agent pursuant
to Section 2(a) above shall be issued within ten (10) days following the conversion of such notes into common stock.

 

    	 

     

    

 

ProLung,
Inc.

February
27, 2018

Page
| 3

 

(c)       Expense
Reimbursement. In addition to the compensation provided for in Section 2(a) above, the Company shall also reimburse the following
expenses to the Agent:

 

(i)       A
$25,000 non-accountable expense allowance (the “Diligence Expense”), of which $15,000 is payable upon the closing
of the first $1,000,000 of the Financing Transaction, and $10,000 is payable upon the close of an aggregate of $3,000,000 of the
Financing Transaction.

 

(ii)       All
out-of-pocket expenses incurred by Agent during the Term on behalf of the Company (the “Marketing Expense”),
which shall in no case exceed one percent (1%) of the gross investment proceeds received from sale of the Convertible Notes (the
“Maximum Expense Reimbursement”), and shall include, without limitation, travel costs, meals and entertainment,
printing and other related costs. Marketing Expenses exceeding $1,000 per incident, or $10,000 in aggregate, shall be subject
to approval by the Company in writing, such approval not to be unreasonably withheld.

 

(iii)       Payment
of Diligence Expense and Marketing Expense shall be due and payable in cash, by wire transfer of immediately available funds to
an account designated by Agent, within ten (10) days after each closing of the Convertible Notes.

 

(iv)       Fees
and expenses payable to Agent according to this Section 2 that are more than thirty (30) days past due shall be subject to a penalty
of 2.0% per month.

 

3.       INDEMNIFICATION.

 

The
Company shall indemnify the Agent in accordance with the terms of the Agent’s indemnity provisions, attached hereto as Appendix
A, which shall be incorporated by this reference.

 

4.       TERM
AND TERMINATION.

 

(i)       The
term (the “Term”) of this Agreement will be 90 days, beginning on the date hereof. Within the Term, the Agreement
may be terminated (i) by the Company for Cause by written notice, or (ii) by Agent with fifteen (15) days written notice. The
provisions of Sections 2, 3, 4, 5 and 7 hereof shall survive any expiration or termination of this Agreement. 

 

(ii)       Notwithstanding
anything to the contrary herein, unless this Agreement is terminated by the Company for Cause (as defined below), in the event
that the Company closes a financing transaction (excluding any underwritten offering) within one (1) year following the expiration
of the Term (the “Tail Period”) with an investor originally introduced by Agent, the Company shall pay and
deliver to Agent all fees, expenses and warrants set forth in Section 2(a), in accordance with the terms thereof as though such
Financing Transaction were consummated during the Term. 

 

(iii)       As
used in this paragraph, “Cause” means gross negligence, bad faith or willful misconduct by Agent, a material
breach of this Agreement by Agent, or a material failure by the Agent to provide the services as contemplated by this Agreement;
provided, however, that such breach or failure is either not capable of remedy or, if capable of remedy, is not remedied promptly
and in any event with (30) days written notice thereof given to Agent by the Company.

 

    	 

     

    

 

ProLung, Inc.

February 27,
2018

Page | 4

 

5.       REPRESENTATIONS,
WARRANTIES AND COVENANTS.

 

(a)       Representations
and Warranties.

 

(i)       Each
party represents and warrants to the other party that (A) such party is duly organized, validly existing and in good standing
under the laws of the state of its formation and has all requisite power and authority to carry on its business as presently conducted
and as proposed to be conducted, (B) all corporate action required to be taken by such party in order to authorize the Company
to enter into this Agreement and, where applicable, issue the warrants described in Section 2(a) has been taken or will be taken
prior to the consummation of a transaction, and (C) this Agreement, when executed and delivered by the parties, shall constitute
valid and legally binding obligations of the parties, enforceable against each.

 

(ii)       Agent
represents and warrants that: (A) it is a broker/dealer registered with the U.S. Securities & Exchange Commission (“SEC”),
and a member in good standing with the Financial Industry Regulatory Authority (“FINRA”) and any applicable
state agencies; (B) no proceedings are pending or to the Agent’s knowledge, threatened, to revoke or limit its good standing
or status with any such federal or state agency or authority; and (C) it holds all permits, licenses and other registrations required
to perform the services contemplated to be performed by Agent under the terms of this Agreement. Agent further represents and
warrants that it is an Accredited Investor. 

 

(iii)       Company
represents, warrants and agrees that it will exercise reasonable care to assure that the purchasers of the securities are not
underwriters within the meaning of Section 2(11) of the Securities Act and, without limiting the foregoing, that such purchases
will comply with Rule 502(d) under the Act. Company will also file Form D with the Securities and Exchange Commission as Contemplated
by Rule 506 under the Securities Act. 

 

(iv)       Agent
represents, warrants and agrees that neither it, nor any of its directors, executive officers, or other officers participating
in the marketing or sale of the Convertible Notes, nor any other officers or employees of Agent or any such general partner or
managing member that have been or will be paid (directly or indirectly) remuneration for solicitation of purchasers in connection
with any Financing Transaction (each, an “Agent Covered Person”), is subject to any of the “Bad Actor”
disqualifications described in Rule 506(d)(1)(i) to (viii) under the Securities Act (a “Disqualification Event”),
except for a Disqualification Event (i) contemplated by Rule 506(d)(2) under the Securities Act and (ii) a description of which
has been furnished in writing to the Company prior to the date hereof. The Agent shall provide prompt written notice to the Company
of any Disqualification Event relating to any Agent Covered Person, or any event that would, with the passage of time, become
such a Disqualification Event, prior to closing the Transaction. The Agent represents and warrants that it is not aware of any
person other than any Covered Person or Agent Covered Person that has been or will be paid (directly or indirectly) remuneration
for solicitation of purchasers in connection with the sale of Securities, and the Agent will notify the Company, prior to Closing
the Transaction, of any agreement entered into between the Agent and such person in connection with any sale of Securities.

 

(v)       Each
party represents, warrants and agrees that all sales of Convertible Notes in this Transaction shall be made only to Accredited
Investors.

 

    	 

     

    

 

ProLung, Inc.

February 27,
2018

Page | 5

 

(vi)       The
Company acknowledges and agrees that Agent will provide, and the Company shall not rely on Agent for, tax, legal or accounting
advice.

 

(b)       Confidentiality.
Except as contemplated by the terms hereof or as required by applicable law or legal process (a “Demand”),
Agent shall keep confidential all material non-public information provided to it by or at the request of the Company, and shall
not disclose such information to any third party or to any of its employees or advisors except to those persons who have a need
to know such information in connection with Agent’s performance of its responsibilities hereunder and who are advised of
the confidential nature of the information and who agree to keep such information confidential. In the event of the public
announcement of any Financing Transaction, if approved by the Company, Agent shall have the right to disclose its participation
in such Financing Transaction, including, without limitation, the placement at its cost of “tombstone” advertisements
in financial and other newspapers and journals. Except as required by applicable law, pursuant to an order of a court of competent
jurisdiction or the request of a regulatory authority having jurisdiction over the Company or its affiliates, any advice to be
provided by Agent under this Agreement shall not be disclosed publicly or made available to third parties (other than the Company’s
other professional advisors) without the prior written consent of Agent (which consent shall not be unreasonably withheld, conditioned
or delayed). Notwithstanding the foregoing, the parties announce that if a Financing closes, the material terms of Agent’s
engagement will need to be disclosed on Form 8-K, and a copy of this Agreement may need to be filed with the SEC. In the event
that Agent is served with a Demand, Agent will promptly advise the Company of the same and will cooperate with all reasonable
and lawful requests by the Company to prevent the disclosure of confidential and/or proprietary information pursuant to such Demand.
Notwithstanding any of the foregoing, the following will not constitute confidential information for purposes of this Agreement:
(i) information which was already in Agent’s possession (or the possession of any of its professionals) and not subject
to any existing confidentiality obligations to the Company, or that was available to Agent on a non-confidential basis, prior
to its receipt from the Company; (ii) information which is obtained by Agent (or any of its professionals) from a third person
who, insofar as is known to Agent, is not prohibited from transmitting the information to Agent by a contractual, legal or fiduciary
obligation to the Company; or (iii) information which is or becomes publicly available through no fault of Agent or any of its
professionals.

 

(c)       Attorneys’
Fees. If any action, proceeding or arbitration at law or in equity is necessary to enforce or interpret the terms of
this Agreement, and a party is found to have violated the terms of this Agreement, a non-violating party agrees that, in addition
to any other relief that a non-violating party may be entitled, it shall also indemnify and reimburse a non-violating party for
all of its reasonable attorneys’ fees, costs and disbursements incurred in connection with such action.

 

6.       CERTAIN
DEFINITIONS.

 

(a)       “Transaction
Value” shall mean the total proceeds and other consideration payable to the Company, or contributed into any
collaboration between the Company and a counter-party to placement of the Convertible Notes, including cash, securities and/or
other property paid to the Company in connection with this Agreement.

 

    	 

     

    

 

ProLung,
Inc.

February
27, 2018

Page
| 6

 

7.       MISCELLANEOUS.

 

This
Agreement contains the entire understanding between the parties with respect to its subject matter. Neither this Agreement
nor any provision contained this Agreement may be amended, terminated, extended, varied, modified, supplemented, or otherwise
changed except by written agreement signed by each party. Headings are inserted for reference only and shall not in any
way define or affect the meaning, construction or scope of any of the provisions of this Agreement. A waiver by a party
of any right or provision under this Agreement must be in writing and shall not operate or be construed as a waiver of such right
or provision at any other time. This Agreement shall not be assigned unless by written agreement among the parties, provided
that either party may assign this Agreement to the purchaser of substantially all of its assets and business. This Agreement
shall inure to the benefit of, and may be enforced by the successors and assigns of, each party. This Agreement is entered
into under the laws of the State of Utah and shall be governed by the laws of such state (without giving effect to its conflicts
of law principles). Any lawsuit or legal action or proceeding relating to this Agreement shall be brought in one of the
state or federal courts sitting in Salt Lake County, Utah, and the parties submit to the jurisdiction of such courts for that
purpose and hereby irrevocably waive all rights to a trial by jury in any such action or proceeding. If any provision of
this Agreement is found to be invalid or unenforceable, the parties agrees that any such provision may be altered or modified
in a manner so as to protect the parties’ respective legitimate business interests and that such finding shall not affect
the validity or enforcement of the other provisions of this Agreement. This Agreement may be executed in counterparts,
each of which shall be deemed an original and all of which shall constitute a single agreement. Each party represents and
warrants to the other party that it has had a full opportunity to seek legal advice and representation by an independent counsel
of its own choosing in connection with this Agreement and such party has either done so or, in its business judgment, declined
to do so.

 

If
the terms of our engagement as set forth in this Agreement are satisfactory to you, kindly countersign and date the enclosed copy
of this Agreement and return it to us. This Agreement shall be effective and binding as of the date of your countersignature
below.

 

	 	Very
    truly yours,
	 	 	 
	 	PROLUNG,
    INC.
	 	 	 
	 	By:	/s/ Steven
    C. Eror
	 	 	Steven
    C. Eror
	 	 	President
    and CEO

 

	ACCEPTED
    AND AGREED:	 
	 	 
	WEILD
    & CO., INC. 	 
	 	 	 
	By:	/s/
    David Weild	 
	Name:	David
    Weild	 
	Title:
    	Manager,
    Chairman & CEO	 
	Dated:	February
    28, 2018	 

 

    	 

     

    

 

APPENDIX
A

 

INDEMNIFICATION
PROVISION

 

This
Appendix A is a part of and is incorporated into that certain letter agreement (together, the “Letter Agreement”)
dated February 27, 2018 by and between ProLung, Inc. (the “Company”), and Weild & Co., Inc. and its subsidiary
broker/dealer Weild Capital, LLC (collectively, the “Advisor”).

 

The
Company will indemnify and hold harmless the Advisor and their respective directors, officers, agents and employees of the Advisor
(each such entity or person, an “Indemnified Person”) from and against any losses, claims, damages, judgments,
assessments, costs and other liabilities (collectively “Liabilities”), and will reimburse each Indemnified
Person for all fees and expenses (including the reasonable fees and expenses of counsel) (collectively, “Expenses”)
as they are incurred in investigating, preparing, pursuing or defending any claim, action, proceeding or investigation, in connection
with pending or threatened litigation or arbitration (collectively, “Actions”), arising out of or in connection
with advice or services rendered or to be rendered by any Indemnified Person pursuant to the Letter Agreement, the transactions
contemplated hereby or any Indemnified Person’s actions or inactions in connection with any such advice, services or transactions;
provided that the Company will not be responsible for any Liabilities or Expenses of any Indemnified Person that are determined
by a judgment of a court of competent jurisdiction which is no longer subject to appeal or further review to have resulted from
such Indemnified Person’s fraud, gross negligence or willful misconduct in connection with any of the advice, actions, inactions
or services referred to above. The Company also agrees to reimburse each Indemnified Person for all Expenses as they are incurred
in connection with enforcing such Indemnified Person’s rights under this Appendix A.

 

Upon
receipt by an Indemnified Person of actual notice of an Action against such Indemnified Person with respect to which indemnity
may be sought under this Agreement, such Indemnified Person shall promptly notify the Company in writing; provided that failure
to so notify the Company shall not relieve the Company from any liability which the Company may have on account of this indemnity
or otherwise, except to the extent the Company shall have been materially prejudiced by such failure. An Indemnified Person will
provide the Company with all information, cooperation and approvals that the Company reasonably requires and an Indemnified Person
can reasonably provide in connection with such Action. The Company shall, if requested by the Advisor, assume the defense of any
such Action including the employment of counsel reasonably satisfactory to the Advisor. Any Indemnified Person shall have the
right to employ separate counsel in any such action and participate in the defense thereof but the fees and expenses of such counsel
shall be at the expense of such Indemnified Person, unless: (i) the Company has failed to assume the defense and employ counsel
or (ii) the named parties to any such Action (including any impleaded parties) include such Indemnified Person and the Company,
and such Indemnified Person shall have been advised by counsel that there may be one or more legal defenses available to it that
are in conflict with those available to the Company; provided that the Company shall not in such event be responsible hereunder
for the fees and expenses of more than one firm of separate counsel in connection with any Action in the same jurisdiction, in
addition to any local counsel. The Company shall not be liable for any settlement of any Action effected without its written consent,
which consent shall not be unreasonably withheld. In addition, the Company will not, without prior written consent of the Advisor,
which consent shall not be unreasonably withheld, settle, compromise or consent to the entry of any judgment in or otherwise seek
to terminate any pending or threatened Action in respect of which indemnification or contribution may be sought hereunder (whether
or not any Indemnified Person is a party thereto) unless such settlement, compromise, consent or termination includes an unconditional
release of each Indemnified Person from all Liabilities arising out of such Action.

 

    	 

     

    

 

ProLung,
Inc.

February
22, 2018

Page
| 8

 

In
the event the foregoing indemnity is unavailable to an Indemnified Person other than in accordance with this Agreement, the Company
shall contribute to the Liabilities and Expenses paid or payable by such Indemnified Person in such proportion as is appropriate
to reflect (i) the relative benefits to the Company and its stockholders or owners, on the one hand, and to the Advisor, on the
other hand, of the matters contemplated by this Agreement or (ii) if the allocation provided by the immediately preceding clause
is not permitted by the applicable law, not only such relative benefits but also the relative fault of the Company, on the one
hand, and the Advisor, on the other hand, in connection with the matters as to which such Liabilities or Expenses relate, as well
as any other relevant equitable considerations; provided that in no event shall the Company contribute less than the amount necessary
to ensure that all Indemnified Persons, in the aggregate, are not liable for any Liabilities and Expenses in excess of the amount
of fees actually received by the Advisor pursuant to this Agreement. For purposes of this paragraph, the relative benefits to
the Company and its stockholders or owners, on the one hand, and to the Advisor, on the other hand, of the matters contemplated
by this Agreement shall be deemed to be in the same proportion as (a) the total value paid or contemplated to be paid or received
or contemplated to be received by the Company or the Company’s stockholders or owners, as the case may be, in the transaction
or transactions that are within the scope of this Agreement, whether or not any such transaction is consummated, bears to (b)
the fees paid or to be paid to the Advisor under this Agreement.

 

The
reimbursement, indemnity and contribution obligations of the Company set forth herein shall apply to any modification of this
Agreement and shall remain in full force and effect regardless of any termination of, or the completion of any Indemnified Person’s
services under or in connection with, this Agreement.

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