# EDGAR Filing Document

**Accession Number:** 0001434524
**File Stem:** 0001104659-23-040244
**Filing Date:** 2023-3
**Character Count:** 29719
**Document Hash:** 4422df04cfaa0fa831bad894bf54be91
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-23-040244.hdr.sgml**: 20230331

**ACCESSION NUMBER**: 0001104659-23-040244

**CONFORMED SUBMISSION TYPE**: S-8

**PUBLIC DOCUMENT COUNT**: 5

**FILED AS OF DATE**: 20230331

**DATE AS OF CHANGE**: 20230331

**EFFECTIVENESS DATE**: 20230331

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ClearSign Technologies Corp
- **CENTRAL INDEX KEY:** 0001434524
- **STANDARD INDUSTRIAL CLASSIFICATION:** INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** WA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-8
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-271042
- **FILM NUMBER:** 23788507

**BUSINESS ADDRESS:**
- **STREET 1:** 8023 E. 63RD PLACE, SUITE 101
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74133
- **BUSINESS PHONE:** (918) 236-6461

**MAIL ADDRESS:**
- **STREET 1:** 8023 E. 63RD PLACE, SUITE 101
- **CITY:** TULSA
- **STATE:** OK
- **ZIP:** 74133

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CLEARSIGN COMBUSTION CORP
- **DATE OF NAME CHANGE:** 20080507

**As filed with the U.S. Securities and Exchange Commission on March 31, 2023**

**Registration No. 333-________**

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION**

**Washington, D.C. 20549**

**FORM S-8**

**REGISTRATION STATEMENT**

**UNDER THE SECURITIES ACT OF 1933**

**ClearSign Technologies Corporation**

(Exact name of Registrant as specified in its charter)

---

| | |
|:---|:---|
| &nbsp;&nbsp;**Washington** | &nbsp;&nbsp;**26-2056298** |
| &nbsp;&nbsp;(State or other jurisdiction of incorporation or organization) | &nbsp;&nbsp;(IRS Employer Identification Number) |
| &nbsp;&nbsp; **8023 East 63<sup>rd</sup> Place, Suite 101**<br> **Tulsa, Oklahoma** | &nbsp;&nbsp;**74133** |
| &nbsp;&nbsp;(Address of Principal Executive Offices) | &nbsp;&nbsp;(Zip Code) |

---

**ClearSign Technologies Corporation 2021 Equity Incentive Plan**

(Full title of the plan)

**Brent Hinds**

**Vice President and Controller**

**ClearSign Technologies Corporation**

**8023 East 63<sup>rd</sup> Place, Suite 101**

**Tulsa, Oklahoma 74133**

**(918) 236-6461**

(Name, address and telephone number, including area code, of agent for service)

**Copies to:**

**Blake Baron, Esq.**

**Nimish Patel, Esq.**

**Mitchell Silberberg & Knupp LLP**

**437 Madison Avenue**

**New York, New York 10022**

**Phone: (212) 509-3900**

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer ◻ Accelerated filer ◻ <br> Non-accelerated filer ⌧ Smaller reporting company ⌧ <br> Emerging growth company ◻

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ◻

**REGISTRATION OF ADDITIONAL SHARES**

**PURSUANT TO GENERAL INSTRUCTION E**

Pursuant to General Instruction E of Form S-8, ClearSign Technologies Corporation ("Registrant") is filing this Registration Statement on Form S-8 with the U.S. Securities and Exchange Commission (the "Commission") to register 400,000 additional shares of the Registrant's common stock for issuance under the Registrant's 2021 Equity Incentive Plan (the "2021 Plan"), pursuant to the provisions of the 2021 Plan that provide for an automatic annual increase in the number of shares reserved for issuance under the 2021 Plan. This Registration Statement hereby incorporates by reference the contents of the Registrant's registration statement on Form S-8 filed with the Commission on July 2, 2021 (File No. 333-257659) and April 26, 2022 (File No. 333-264492). In accordance with the instructional note to Part I of Form S-8 as promulgated by the Commission, the information specified by Part I of Form S-8 has been omitted from this Registration Statement.

**PART II**

**INFORMATION REQUIRED IN THE REGISTRATION STATEMENT**

**Item 3. Incorporation of Documents by Reference.**

The Registrant incorporates by reference into this Registration Statement the following documents:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Registrant's Annual Report on [Form 10-K](https://www.sec.gov/ix?doc=/Archives/edgar/data/1434524/000155837023005285/clir-20221231x10k.htm) for
 the fiscal year ended December 31, 2022, filed with the Commission on March 31, 2023;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) All other reports filed pursuant
to Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the Registrant's Annual Report referred to
in (a) above; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The description of the Registrant's
Common Stock set forth in [Exhibit 4.2](https://www.sec.gov/Archives/edgar/data/1434524/000110465920039929/tm205247d1_ex4-2.htm) of the Registrant's Annual Report for the fiscal year ended December 31, 2019 on Form 10-K filed with the Commission
on March 30, 2020, including any future amendment or report filed for the purpose of updating such description.

All documents subsequently filed by the Registrant with the Commission pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Securities Exchange Act of 1934, as amended, (which does not include information furnished pursuant to Item 2.02 or Item 7.01 of any Current Report on Form 8-K, unless expressly stated therein) after the date of this Registration Statement, but prior to the filing of a post-effective amendment to this Registration Statement which indicates that all securities offered by this Registration Statement have been sold or which deregisters all such securities then remaining unsold, shall be deemed to be incorporated by reference into this Registration Statement. Each document incorporated by reference into this Registration Statement shall be deemed to be a part of this Registration Statement from the date of the filing of such document with the Commission until the information contained therein is superseded or updated by any subsequently filed document which is incorporated by reference into this Registration Statement.

**Item 4. Description of Securities.**

Not applicable.

**Item 5. Interests of Named Experts and Counsel.**

Not applicable.

**Item 6. Indemnification of Directors and Officers.**

Sections 23B.08.500 through 23.B.08.603 of the Washington Business Corporation Act (the "WBCA") authorize a court to award, or a corporation's board of directors to grant, indemnification to directors and officers on terms sufficiently broad to permit indemnification under certain circumstances for liabilities arising under the Securities Act of 1933, as amended (the "Securities Act"). Section 23B.08.320 of the WBCA authorizes a corporation to limit a director's liability to the corporation or its shareholders for monetary damages for acts or omissions as a director, except in certain circumstances involving intentional misconduct, knowing violations of law or illegal corporate loans or distributions, or any transaction from which the director personally receives a benefit in money, property or services to which the director is not legally entitled.

The Registrant's Articles of Incorporation provide that, to the fullest extent permitted by Washington law, the Registrant's directors will not be liable to the Registrant or its shareholders for monetary damages. This provision, however, does not eliminate or limit liability for acts or omissions that involve intentional misconduct or a knowing violation of law by a director, for conduct violating WBCA section 23B.08.310 (approval of an unlawful distribution) or for any transaction from which the director will personally receive a benefit in money, property, or services to which the director is not legally entitled. Pursuant to section 23B.08.52 of the WBCA, because the Registrant's Articles of Incorporation do not limit the obligation, the Registrant must indemnify a director who was wholly successful, on the merits or otherwise, in the defense of any proceeding to which the director was a party because of being a director against reasonable expenses incurred by the director in connection with the proceeding.

The Registrant's Bylaws further provide that each person who was, is or is threatened to be made a party to or is otherwise involved in any threatened, pending or completed action, suit, claim or proceeding, whether civil, criminal, administrative or investigative and whether formal or informal, by reason of the fact that he or she is or was a director or officer of the Registrant or was serving at the Registrant's request as a director, officer, partner, trustee, employee or agent of another entity, shall be indemnified and held harmless against all losses, claims, damages, liabilities and expenses actually and reasonably incurred or suffered in connection with the proceeding. This indemnification right continues even after the individual has ceased to be a director or officer or to serve at the Registrant's request as a director, officer, partner, trustee, employee or agent of another entity. However, if the person indemnified initiates the proceeding, he or she shall be entitled to indemnification only if the proceeding was authorized or ratified by the Registrant's board of directors. No indemnification will be provided for acts or omissions finally adjudged to be intentional misconduct or a knowing violation of law, for conduct finally adjudged to be in violation of WBCA section 23B.08.310, for any transaction with respect to which it was finally adjudged that the indemnitee personally received a benefit in money, property or services to which the indemnitee was not legally entitled or if the Registrant is otherwise prohibited by applicable law from paying indemnification. The Registrant must advance expenses to an indemnitee for an indemnification obligation so long as the Registrant receives an undertaking by or on behalf of the indemnitee to repay all amounts so advanced if it is determined by a final judicial decision from which there is no further right to appeal that the indemnitee is not entitled to be indemnified.

The Registrant currently carries liability insurance for its directors and officers.

The Registrant has entered into, and will enter into in the future, indemnification agreements with the individuals who serve as its officers and directors. Pursuant to these agreements, the Registrant will indemnify officers and directors who are made parties to, or threatened to be made parties to, any proceeding by reason of the fact that they are or were officers or directors, or are or were serving at the Registrant's request as a director, officer, employee, or agent of another entity. The agreements require the Registrant to indemnify its officers and directors against all expenses, judgments, fines and penalties actually and reasonably incurred by them in connection with the defense or settlement of any such proceeding, subject to the terms and conditions of the agreements.

**Item 7. Exemption from Registration Claimed.**

Not applicable.

**Item 8. Exhibits.**

---

| | |
|:---|:---|
| **Exhibit**<br> **No.** | **Description of Document** |
| [4.1](https://www.sec.gov/Archives/edgar/data/1434524/000110465919063298/tm1919478d1_ex3-1x1.htm) | [Articles of Incorporation of ClearSign Technologies Corporation (1)](https://www.sec.gov/Archives/edgar/data/1434524/000110465919063298/tm1919478d1_ex3-1x1.htm) |
| [4.2](https://www.sec.gov/Archives/edgar/data/1434524/000114420411064058/v240232_ex3-3.htm) | [Bylaws of ClearSign Technologies Corporation, as amended, effective September 8, 2021 (2)](https://www.sec.gov/Archives/edgar/data/1434524/000114420411064058/v240232_ex3-3.htm) |
| [4.3](https://www.sec.gov/Archives/edgar/data/1434524/000114420415012243/v400802_ex4-1.htm) | [Form of Common Stock Certificate (3)](https://www.sec.gov/Archives/edgar/data/1434524/000114420415012243/v400802_ex4-1.htm) |
| [5.1](tm2310266d1_ex5-1.htm) | [Opinion of Mitchell Silberberg & Knupp LLP (filed herewith)](tm2310266d1_ex5-1.htm) |
| [23.1](tm2310266d1_ex23-1.htm) | [Consent of BPM CPA LLP, Independent Registered Public Accounting Firm (filed herewith)](tm2310266d1_ex23-1.htm) |
| [23.2](tm2310266d1_ex5-1.htm) | [Consent of Mitchell Silberberg & Knupp LLP (included in Exhibit 5.1)](tm2310266d1_ex5-1.htm) |
| [24.1](#a_001) | [Power of Attorney (included on the signature page of this Registration Statement)](#a_001) |
| [99.1](https://www.sec.gov/Archives/edgar/data/1434524/000110465921062561/tm2114678d1_def14a.htm#Kalai_015) | [ClearSign Technologies Corporation 2021 Equity Incentive Plan (4)](https://www.sec.gov/Archives/edgar/data/1434524/000110465921062561/tm2114678d1_def14a.htm#Kalai_015) |
| [99.2](https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d13.htm) | [2021 Equity Incentive Plan Form of Stock Option Award Agreement (5)](https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d13.htm) |
| [99.3](https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d14.htm) | [2021 Equity Incentive Plan Form of Restricted Stock Unit Award Agreement (5)](https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d14.htm) |
| [99.4](https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d15.htm) | [2021 Equity Incentive Plan Form of Restricted Stock Award Agreement (5)](https://www.sec.gov/Archives/edgar/data/1434524/000155837022004842/clir-20211231xex10d15.htm) |
| [107](tm2310266d1_exfilingfees.htm) | [Filing Fee Table (filed herewith)](tm2310266d1_exfilingfees.htm) |

---

[(1) Incorporated by reference from the Registrant's Form 10-Q for the quarter ended September 30, 2019 filed with the Securities and Exchange Commission on November 13, 2019.](https://www.sec.gov/Archives/edgar/data/1434524/000110465919063298/tm1919478d1_10q.htm)

[(2) Incorporated herein by reference from the Registrant's Current Report on Form 8-K filed with the Securities and Exchange Commission on September 10, 2021.](https://www.sec.gov/ix?doc=/Archives/edgar/data/0001434524/000110465921114754/tm2127344d2_8k.htm)

[(3) Incorporated herein by reference from the Registrant's Annual Report on Form 10-K for the year ended December 31, 2014 filed with the Securities and Exchange Commission on February 26, 2015.](https://www.sec.gov/Archives/edgar/data/1434524/000114420415012243/v400802_10k.htm)

[(4) Incorporated herein by reference from Appendix A to the Registrant's Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on May 7, 2021.](https://www.sec.gov/Archives/edgar/data/1434524/000110465921062561/tm2114678d1_def14a.htm)

[(5) Incorporated herein by reference from the Registrant's Annual Report on Form 10-K for the year ended December 31, 2021 filed with the Securities and Exchange Commission on March 31, 2022.](https://www.sec.gov/ix?doc=/Archives/edgar/data/0001434524/000155837022004842/clir-20211231x10k.htm)

**Item 9. Undertakings.**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The undersigned Registrant hereby undertakes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

i. to include any prospectus required
by section 10(a)(3) of the Securities Act;

ii. to reflect in the prospectus any
facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof)
which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding
the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed
that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the
form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent
no more than 20% change in the maximum aggregate offering price set forth in the "Calculation of Registration Fee" table
in the effective registration statement; and

iii. to include any material information
with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information
in the registration statement;

provided, however, that paragraphs (a)(1)(i) and (a)(1)(ii) of this section do not apply if the registration statement is on Form S-8, and the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the Registrant pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3. To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Registrant's annual report pursuant to section 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual report pursuant to section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

**SIGNATURES**

Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Tulsa, State of Oklahoma, on March 31, 2023.

---

| | |
|:---|:---|
| **CLEARSIGN TECHNOLOGIES CORPORATION** | **CLEARSIGN TECHNOLOGIES CORPORATION** |
| By: | */s/ Colin James Deller* |
|  | Colin James Deller<br> Chief Executive Officer |
| By | */s/ Brent Hinds* |
|  | Brent Hinds<br> Vice President and Controller |

---

**POWER OF ATTORNEY**

We, the undersigned officers and directors of ClearSign Technologies Corporation (the "Company"), hereby constitute and appoint Colin James Deller and Brent Hinds and each of them, the true and lawful agents and attorneys-in-fact of the undersigned with full power and authority in said agents and attorneys-in-fact, and in any one or more of them, to sign for the undersigned and in their respective names as an officer/director of the Company, a registration statement on Form S-8 (or other appropriate form) relating to the offer and sale of common stock of the Company pursuant to this Registration Statement and any amendments thereto and file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, and with full power of substitution; hereby ratifying and confirming all that each of said attorneys-in-fact, or his/her substitute or substitutes, may do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated:

---

| | | |
|:---|:---|:---|
| **Signature** | **Title** | **Date** |
| */s/ Colin James Deller* | Chief Executive Officer and Director | March 31, 2023 |
| Colin James Deller | (Principal Executive Officer) |  |
| */s/ Brent Hinds* | Vice President and Controller | March 31, 2023 |
| Brent Hinds | (Principal Financial and Accounting Officer) |  |
| */s/ Robert T. Hoffman Sr.* | Director | March 31, 2023 |
| Robert T. Hoffman Sr. |  |  |
| */s/ Judith S. Schrecker* | Director | March 31, 2023 |
| Judith S. Schrecker |  |  |
| */s/ Gary J. DiElsi* | Director | March 31, 2023 |
| Gary J. DiElsi |  |  |
| */s/ Catharine de Lacy* | Director | March 31, 2023 |
| Catharine de Lacy |  |  |

---

## Exhibit 5.1

**Exhibit 5.1**

![](tm2310266d1_ex5-1img001.jpg)

------

Mitchell Silberberg & Knupp llp

A Law Partnership Including Professional Corporations

March 31, 2023

ClearSign Technologies Corporation

8023 East 63rd Place, Suite 101

Tulsa, Oklahoma 74133

---

| | |
|:---|:---|
| **Re:** | **<u>Registration Statement on Form S-8</u>** |

---

Ladies and Gentlemen:

We have acted as counsel to ClearSign Technologies Corporation, a Washington corporation (the "<u>Company</u>"), and are delivering this opinion in connection with the filing of the Company's Registration Statement on Form S-8 (the "<u>Registration Statement</u>") with the Securities and Exchange Commission for the purpose of registering under the Securities Act of 1933, as amended (the "<u>Securities Act</u>"), an aggregate of 400,000 shares (the "<u>Shares</u>") of common stock, $0.0001 par value per share (the "<u>Common Stock</u>"), issuable pursuant to the Company's 2021 Equity Incentive Plan (the "<u>Plan</u>").

For purposes of rendering this opinion, we have examined the Plan, the Registration Statement, the Articles of Incorporation and the Bylaws of the Company, as amended or restated, the proceedings and other actions of the Company that provide for the issuance of the Shares, and such other documents and matters as we have deemed necessary for purposes of rendering this opinion. We have assumed the authenticity of all documents submitted to us as originals, the conformity to originals of all documents submitted to us as certified or photostatic copies and the authenticity of the originals of all documents submitted to us as copies. We have also assumed the legal capacity of all natural persons who have executed documents examined by us, the genuineness of all signatures on all documents examined by us, the authority of such persons signing on behalf of the parties thereto other than the Company and the due authorization, execution and delivery of all documents by the parties thereto other than the Company. In rendering the opinion set forth below, we have assumed that certificates evidencing the Shares will be signed by the authorized officers of the Company and registered by the transfer agent and registrar and will conform to the specimen certificate for the Common Stock. In addition, we have assumed that the resolutions of the Company's board of directors or its applicable committee authorizing the Company to issue and deliver the Shares will be in full force and effect at all times at which such Shares are issued and delivered by the Company, and that the Company will take no action inconsistent with such resolutions.

Based upon and subject to the foregoing, it is our opinion that the Shares, when issued, delivered and paid for in accordance with the Plan and in the manner described in the Registration Statement and the related prospectus, will be validly issued, fully paid, and non-assessable.

This opinion is opining upon and is limited to the current federal laws of the United States and the Washington Business Corporation Act. We express no opinion with respect to the effect or applicability of the laws of any other jurisdiction. We assume no obligation to revise or supplement this opinion letter should the laws of such jurisdictions be changed after the date hereof by legislative action, judicial decision, or otherwise.

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement. In giving our consent we do not hereby admit that we are in the category of persons whose consent is required under Section 7 of the Securities Act.

---

| |
|:---|
| Sincerely, |
| /s/ Mitchell Silberberg & Knupp LLP |
| Mitchell Silberberg & Knupp LLP |

---

437 Madison Ave., 25th Floor, New York, New York 10022-7001<br> Phone: (212) 509-3900 Fax: (212) 509-7239 Website: www.msk.com

## Exhibit 23.1

**Exhibit 23.1**

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM**

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 31, 2023, relating to the consolidated financial statements of ClearSign Technologies Corporation, which appears in the Annual Report on Form 10-K of ClearSign Technologies Corporation for the year ended December 31, 2022.

/s/ BPM CPA LLP

March 31, 2023

Santa Monica, California

## Ex-Filing

**EXHIBIT 107**

**Calculation of Filing Fee Table**

**Form S-8**

(Form Type)

**ClearSign Technologies Corporation**

(Exact Name of Registrant as Specified in its Charter)

Newly Registered Securities

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;**Security Type** | &nbsp;&nbsp;**Security Class Title** | &nbsp;&nbsp;**Fee Calculation Rule** | &nbsp;&nbsp; **Proposed Maximum Offering Price Per Unit<sup>(3)</sup>**<br>| &nbsp;&nbsp;**Maximum Aggregate Offering Price** | &nbsp;&nbsp;**Fee Rate** | &nbsp;&nbsp;**Amount of Registration Fee** |
| &nbsp;&nbsp;Equity | &nbsp;&nbsp;Common Stock, $0.0001 par value per share | &nbsp;&nbsp;Rule 457(c) and Rule 457(h)&nbsp;&nbsp; 400000<sup>(2)</sup><br>| &nbsp;&nbsp;$0.81 | &nbsp;&nbsp;$324000 | &nbsp;&nbsp;0.00011020 | &nbsp;&nbsp;$35.70 |
| &nbsp;&nbsp;**Total Offering Amounts** | &nbsp;&nbsp;**Total Offering Amounts** | &nbsp;&nbsp;**Total Offering Amounts** |  |  |  | &nbsp;&nbsp;$35.70 |
| &nbsp;&nbsp;**Total Fee Offsets** | &nbsp;&nbsp;**Total Fee Offsets** | &nbsp;&nbsp;**Total Fee Offsets** |  |  |  | &nbsp;&nbsp;$— |
| &nbsp;&nbsp;**Net Fee Due** | &nbsp;&nbsp;**Net Fee Due** | &nbsp;&nbsp;**Net Fee Due** |  |  |  | &nbsp;&nbsp;$35.70 |

---

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) Pursuant to Rule 416(a) under the Securities Act of 1933, as amended ("Securities Act"), this Registration Statement shall also cover any additional shares of the Registrant's common stock that become issuable in respect of the securities identified in the above table by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without the Registrant's receipt of consideration that results in an increase in the number of the outstanding shares of the Registrant's common stock.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) Represents additional shares of the Registrant's common stock reserved for issuance under the Registrant's 2021 Equity Incentive Plan (the "2021 Plan") pursuant to the provisions of the 2021 Plan that provide for an automatic annual increase in the number of shares reserved for issuance under the 2021 Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) Estimated in accordance with Rules 457(c) and (h) of the Securities Act solely for the purpose of calculating the registration fee based on the average of the high and low prices of the Registrant's common stock as reported on The Nasdaq Stock Market LLC on March 28, 2023.