Document:

Exhibit 4.1

THE SECURITIES REPRESENTED BY THIS DOCUMENT HAVE NOT BEEN REGISTERED UNDER THE
SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR THE SECURITIES LAWS OF ANY
STATE OR OTHER COUNTRY, AND MAY NOT BE OFFERED, SOLD TRANSFERRED, PLEDGED,
HYPOTHECATED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO (I) AN EFFECTIVE
REGISTRATION STATEMENT UNDER THE ACT AND ANY APPLICABLE STATE LAWS, (II) TO THE
EXTENT APPLICABLE, RULE 144 UNDER THE ACT (OR ANY SIMILAR RULE UNDER THE ACT
RELATING TO THE DISPOSITION OF SECURITIES), OR (III) AN OPINION OF COUNSEL, IF
SUCH OPINION SHALL BE REASONABLY SATISFACTORY TO COUNSEL TO THE ISSUER, THAT AN
EXEMPTION FROM REGISTRATION UNDER THE ACT AND APPLICABLE STATE LAW IS AVAILABLE.

                               RHOMBIC CORPORATION
                              CONVERTIBLE DEBENTURE

No. 1

Total Principal Amount: $2,500,000

February 20, 2001

FOR VALUE RECEIVED, the undersigned, RHOMBIC CORPORATION, a Nevada corporation
(the "Company"), hereby promises to pay to the order of Commodore Capital, Inc.
a financial organization located in Nevis West Indies or assigns (the "Holder"),
in lawful money of the United States of America, and in immediately payable
funds, the principal sum of two million five hundred thousand dollars
($2,500,000), with interest thereon, both before and after default until paid,
at the rate of ten percent (10%) per annum, upon the terms and conditions set
forth herein.

1. MATURITY DATE/INTEREST PAYMENTS. The Company shall pay to the Holder
quarterly interest payments in cash with the first payment due on May 1, 2001.
Upon conversion of this Debenture as allowed in this Agreement, all accumulated
but unpaid interest shall be extinguished. This Debenture shall mature and all
principal and accrued interest shall be fully due and payable by the Company to
Holder on April 17, 2002 (the "Maturity Date"). Interest shall be computed on
the actual days in a year and the actual number of days elapsed. Holder shall
fund this Debenture in incremental amounts of $100,000USD commencing May 5, 2001
with twenty five (25) equal payments every fifteen (15) days thereafter. The
first payment shall be in the amount of $200,000 USD $100,000 of which is hereby
acknowledged as received. The payments shall be on the dates specified in
Schedule A.

2. CONVERTIBILITY. This Debenture may be converted by the Holder at any time
beginning upon execution of this Debenture and ending upon the Maturity Date at
a conversion rate of one (1) share of Company Common Stock (the "Shares") per an
amount equal to 80% of the closing price of the common stock, as quoted on the
OTC BB, on the day the transmission of funds to the company is confirmed by the
<PAGE>
Holder. The Holder, within its discretion, may not transmit an incremental
payment if the closing common stock price, as quoted on the OTC BB, falls below
$0.15 per share. No accrued interest will be paid upon conversion. The Shares to
be issued upon conversion shall not be subject to any liens, security interests,
pledges, encumbrances, charges, restrictions, demands or claims of any other
party whatsoever. Company shall use its best efforts to expeditiously file with
and have declared effective by the Securities and Exchange Commission a
registration statement in an appropriate form to register the Shares issuable
upon conversion of this Debenture to ensure that Company will have freely
tradable stock available to Holder in the event Holder elects to convert this
Debenture to Shares.

3. PREPAYMENT. The Company may prepay this Debenture prior to the Maturity Date
and prior to the receipt of a conversion election, in whole or in part, at any
time.

4. TRANSFERABILITY. This Debenture shall be freely transferable and assignable
by the Holder provided such transfer or assignment is in compliance with
applicable federal and state securities laws.

5. TERMINATION. Holder may terminate funding this Debenture immediately upon the
occurrence of any of the following events:

a. Bankruptcy or insolvency of the Company;

b. Serious violations (SEC, Reporting, or other) that would adversely affect the
Company's publicly traded stock; or

A prohibition against selling Company product(s) in the United States.

6. DEFAULT. In the event of the Company's failure to pay the principal and
interest due hereunder within ten (10) days following the Maturity Date, Holder
shall have the option, by written notice to the Company, to declare the unpaid
principal amount due to Holder, together with all accrued interest thereon,
immediately due and payable. In the event Company fails to cure the default
within twenty (20) days of the date of receipt of the written notice by Holder,
Holder may pursue any legal remedy available to Holder.

7. NOTICES. Notices to be given hereunder shall be in writing and shall be
deemed to have been sufficiently given if delivered personally or sent by
overnight courier or messenger or sent by registered or certified mail (air mail
if overseas), return receipt requested, or by telex, facsimile transmission,
telegram or similar means of communication. Notice shall be deemed to have been
received on the date of personal delivery, telex, facsimile transmission,
telegram or similar means of communication, or if sent by overnight courier or
messenger, shall be deemed to have been received on the next delivery day after
deposit with the courier or messenger, or if sent by certified or registered
mail, return receipt requested, shall be deemed to have been received on the
fifth business day after the date of mailing. The Parties shall give written
notice of any change of address to each other.

                                       2
<PAGE>
8. INVESTOR STATUS. By providing the principal amount(s) set forth in this
Debenture, Holder acknowledges and certifies that this Debenture represents a
highly speculative investment and that Holder's personal financial situation is
such that (i) Holder can afford to hold the Debenture for an indefinite period
of time and to sustain a complete loss of this investment, and (ii) Holder has
adequate means of providing for Holder's current needs and possible
contingencies and has no need for liquidity in this investment in the Company.
By virtue of Holder's knowledge and experience in financial and business
matters, Holder is capable of evaluating the merits and risks of an investment
in the securities.

Holder, if a corporation, partnership, trust or other form of business entity,
(i) is authorized and otherwise duly qualified to purchase and hold the
Debenture, (ii) has obtained such additional tax and other advice that it has
deemed necessary, and (iii) has not been formed for the specific purpose of
acquiring the Debenture.

Holder consents to the affixing by the Company of such legends on certificates
representing the securities as any applicable federal or state securities law
may require from time to time. Holder further acknowledges and certifies that in
evaluating the suitability of an investment in the Company, Holder has relied on
Holder's own independent investigations and has not relied upon any
representations or other information (whether oral or written) from the Company,
and its officers, directors, agents, employees or representatives. Holder
acknowledges that in making the decision to invest in the Company, Holder has,
prior to any purchase of the securities, been given the information on the
Company, its business, and its financials, had access and opportunity to examine
this offer, and had an opportunity to ask questions of, and to receive answers
from, the Company or any person acting on its behalf concerning the terms and
conditions of this offering. Holder has been furnished with access to all
publicly available materials relating to the business, finances, and operations
of the Company and material relating to the offer and sale of the securities
which have been requested. Holder has received complete and satisfactory answers
to any such inquiries. Holder acknowledges that Holder has not received any
formal disclosure document regarding this investment, and Holder is an
accredited investor as defined in Rule 501 of Regulation D of the Securities Act
of 1933, as amended.

9. GOVERNING LAW. This Debenture shall be governed by and construed and
interpreted in accordance with the laws of the state of Nevada applicable to
contracts made and to be performed entirely therein, without giving effect to
the rules and conflicts of law.

10. ATTORNEYS FEES. In the event of default by the Company requiring the Holder
or any assignee thereof to refer this Debenture to an attorney for collection,
the Company agrees to pay all reasonable costs and expenses incurred in
attempting or effecting collection hereunder, including reasonable attorney's
fees, whether or not suit is instituted.

11. MODIFICATION. This Debenture may be modified or amended only by an agreement
in writing signed by the party against whom the agreement is sought to be
enforced.

                                       3
<PAGE>
12. CONFORMITY WITH LAW. All agreements between the Company and Holder are
expressly limited, so that in no event or contingency whatsoever, whether by
reason of the advancement of the proceeds of this Debenture, acceleration of
maturity of the unpaid principal balance, or otherwise, shall the amount paid or
agreed to be paid to Holder of this Debenture for the use, forbearance, or
detention of the money to be advanced under this Debenture exceed the highest
lawful rate permissible under applicable usury laws. If, under any circumstances
whatsoever, fulfillment of any provision of this Debenture or any other
agreement pertaining hereto, after timely performance of such provision is due,
shall involve transcending the limit of validity prescribed by law which a court
of competent jurisdiction deems applicable, then, ipso facto, the obligations to
be fulfilled shall be reduced to the limit of such validity, and if, under any
circumstances whatsoever, Holder shall ever receive as interest an amount that
exceeds the highest lawful rate, the amount that would be excessive interest
shall be applied to the reduction of the unpaid principal balance under this
Debenture and not to the payment of interest, or, if such excessive interest
exceeds the unpaid balance of principal under this Debenture, such excess shall
be refunded to Company. This provision shall control every other provision of
all agreements between Company and Holder.

     IN WITNESS WHEREOF, the Company and Holder have executed this Debenture as
of March 7, 2001.

                                  The Company

                                  RHOMBIC CORPORATION
                                  a Nevada corporation

                                  BY:  /s/ Roger Duffield
                                       ------------------------
                                       Roger Duffield
                                  ITS: President

                                  The Holder

                                  COMMODORE CAPITAL, INC.

                                  BY: Its Director, FN Management, Ltd.

                                       4
<PAGE>
                                   SCHEDULE A

                    Date Due/
Payment Amount      Date Received       New Total Principal      Initial by Co.
--------------      -------------       -------------------      --------------
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________
$____________       ________/________   ___________________      _______________<PAGE>   1
                                                                     Exhibit 4.1

                AMENDMENT NO. 3 TO CREDIT AND SECURITY AGREEMENT
                ------------------------------------------------

         This Amendment No. 3 to Credit and Security Agreement ("Amendment No.
3") dated effective as of the 1st day of April, 2001, by and between COHESANT
TECHNOLOGIES INC., a Delaware corporation (hereinafter referred to as
"Borrower"), and UNION PLANTERS BANK, N.A. a national banking association
(hereinafter referred to as "Bank").

                              W I T N E S S E T H:

         WHEREAS, the Borrower and the Bank are parties to that certain Credit
and Security Agreement dated as of the 15th day of May, 1998, as amended by that
certain Amendment No. 1 to Credit and Security Agreement dated April 13, 1999,
and as further amended by that certain Amendment No. 2 to Credit and Security
Agreement dated April 17, 2000 (hereinafter referred to as "Agreement"); and

         WHEREAS, the Borrower desires to renew and amend the financial
accommodations previously extended by the Bank; and

         WHEREAS, the Bank is willing to provide such financial accommodations
to the Borrower on the terms and subject to the conditions in the Agreement as
amended by the terms and conditions of this Amendment No. 3.

         NOW, THEREFORE, in consideration of the premises, the mutual covenants
hereinafter contained, and other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties agree as follows:

         SECTION 1. EFFECT OF THIS AMENDMENT NO. 3. This Amendment No. 3 shall
not change, modify, amend or revise the terms, conditions and provisions of the
Agreement, the terms and provisions of which are incorporated herein by
reference, except as expressly provided herein and agreed upon by the parties
hereto. This Amendment No. 3 is not intended to be nor shall it constitute a
novation or accord and satisfaction of the outstanding instruments by and
between the parties hereto. Borrower and Bank agree that, except as expressly
provided herein, all terms and conditions of the Agreement shall remain and
continue in full force and effect. The Borrower acknowledges and agrees that the
indebtedness under the Agreement remains outstanding and is not extinguished,
paid, or retired by this Amendment No. 3, or any other agreements between the
parties hereto prior to the date hereof, and that Borrower is and continues to
be fully liable for all obligations to the Bank contemplated by or arising out
of the Agreement. Except as expressly provided otherwise by this Amendment No.
3, the credit facilities contemplated by this Amendment No. 3 shall be made
according to and pursuant to all conditions, covenants, representations and
warranties contained in the Agreement.

         SECTION 2. DEFINITIONS. Terms defined in the Agreement which are used
herein shall have the same meaning as set forth in the Agreement unless
otherwise specified herein.

<PAGE>   2

         SECTION 3. AMENDMENT OF AGREEMENT. Subject to the satisfaction of the
conditions precedent set forth in Section 5 herein:

         (a) Sections 1.10, 1.11, 1.20, 1.21, 1.22 of the Agreement are hereby
         deleted in their entirety.

         (b) The first sentence of Subsection 2.1 of the Agreement is hereby
         amended and replaced with the following:

         2.1 LINE OF CREDIT. Subject to the further terms and qualifications
contained in this Agreement, so long as no Event of Default or Unmatured Event
of Default has occurred, the Bank shall lend to the Borrower and the Borrower
agrees to borrow from the Bank (and to repay to the Bank in accordance with the
terms hereof) from time to time an aggregate principal sum not to exceed at any
time outstanding Three Million Five Hundred Thousand and No/100 Dollars
($3,500,000.00).

         (c) The first sentence of Subsection 2.1.1 of the Agreement is hereby
         amended and replaced with the following:

         2.1.1 The obligation of the Borrower to repay the Line of Credit Loans
         shall be evidenced by the Line of Credit Note which shall be repayable
         on or before May 1, 2002 ("Maturity").

         (d) Subsection 2.1.5 of the Agreement is hereby amended and replaced
         with the following:

         2.1.5 MANDATORY REDUCTIONS. If at any time the aggregate principal
         outstanding under the Line of Credit exceeds Three Million Five Hundred
         and No/100 Dollars ($3,500,000.00), the Borrower shall immediately
         repay to the Bank, without the necessity of notice or demand from the
         Bank, an amount not less than such excess.

         (5)      The last sentence of Section 2.2 of the Agreement is hereby
                  deleted.

         (f)      Subsection 7.2.1 of the Agreement is hereby amended and
                  replaced with the following:

         7.2.1 As soon as available and in no event later than Twenty (20) days
         after the close of each of Borrower's fiscal quarterly period of each
         fiscal year, a Receivables aging schedule, as of the end of such period
         and certified as accurate by the Borrower's duly authorized
         representative.

         SECTION 4. CONDITIONS PRECEDENT. This Amendment No. 3 shall become and
be deemed effective in accordance with its terms immediately upon the Bank
receiving:

                                      -2-
<PAGE>   3

                  (a) Two (2) copies of this Amendment No. 3 duly executed by
         the authorized officers of the Borrower and the Bank.

                  (b) One (1) copy of the Line of Credit Note reflecting the
         revised Maturity duly executed by an authorized officer of the
         Borrower.

                  (c) Two (2) copies of a Consent and Confirmation of Guaranty
         executed by each of the Guarantors.

                  (d) Certificates of Existence regarding Borrower and
         Guarantors issued by the appropriate Secretary of State's Office.

                  (e) UCC-1 Financing Statements executed by Borrower and
         Guarantors to be filed in those jurisdictions where filing is necessary
         to continue perfection under Revised Article 9 of the UCC.

                  (f) Such other documents and items as the Bank may reasonably
         request.

         SECTION 5. REPRESENTATIONS AND WARRANTIES OF THE BORROWER. The Borrower
hereby represents and warrants, in addition to any other representations and
warranties contained herein, in the Agreement, the Loan Documents (as defined in
the Agreement) or any other document, writing or statement delivered or mailed
to the Bank or its agent by the Borrower, as follows:

                  (a) This Amendment No. 3 constitutes a legal, valid and
         binding obligation of the Borrower enforceable in accordance with its
         terms. The Borrower has taken all necessary and appropriate corporate
         action for the approval of this Amendment No. 3 and the authorization
         of the execution, delivery and performance thereof.

                  (b) As of the date hereof, there is no Event of Default or
         Default under the Agreement, the Amendment No. 3 or the Loan Documents.

                  (c) The Borrower hereby specifically confirms and ratifies its
         obligations, waivers and consents under each of the Loan Documents.

                  (d) Except as specifically amended herein, all
         representations, warranties and other assertions of fact contained in
         the Agreement and the Loan Documents continue to be true, accurate and
         complete.

                  (e) There have been no changes to the Articles of
         Incorporation, By-Laws, the identities of the officers, or the
         composition of the Board of Directors of the Borrower since execution
         of the Agreement.

                                      -3-
<PAGE>   4

                  (f) Borrower acknowledges that the definition "Loan Documents"
         shall include this Amendment No. 3 and all the documents executed
         contemporaneously herewith.

         SECTION 6. AFFIRMATIVE COVENANTS. By entering into this Amendment No.
3, Borrower further specifically undertakes to comply with the obligations,
terms and covenants as contained in the Agreement and agrees to comply therewith
as such relate to the credit facilities and accommodations as provided to the
Borrower pursuant to the terms of this Amendment No. 3.

         SECTION 7. GOVERNING LAW. This Amendment No. 3 has been executed and
delivered and is intended to be performed in the State of Indiana and shall be
governed, construed and enforced in all respects in accordance with the
substantive laws of the State of Indiana.

         SECTION 8. HEADINGS. The section headings used in this Amendment No. 3
are for convenience only and shall not be read or construed as limiting the
substance or generality of this Amendment No. 3.

         SECTION 9. SURVIVAL. All representations, warranties, and covenants of
the Borrower herein or any certificate, agreement or other instrument delivered
by or on its behalf under this Amendment No. 3 shall be considered to have been
relied upon by the Bank and shall survive the making of the Loans and delivery
to the Bank of the Line of Credit Note. All statements and any such certificate
or other instrument shall constitute warranties and representations hereunder by
the Borrower, as the case may be.

         SECTION 10. COUNTERPARTS. This Amendment No. 3 may be signed in one or
more counterparts, each of which shall be considered an original, with the same
effect as if the signatures were upon the same instrument.

         SECTION 11. MODIFICATION. This Amendment No. 3 may be amended,
modified, renewed or extended only by written instrument executed in the manner
of its original execution.

         SECTION 12. WAIVER OF CERTAIN RIGHTS. The Borrower waives acceptance or
notice of acceptance hereof and agrees that the Agreement, this Amendment No. 3,
the Line of Credit Note, and all of the other Loan Documents shall be fully
valid, binding, effective and enforceable as of the date hereof, even though
this Amendment No. 3 and any one or more of the other Loan Documents which
require the signature of the Bank, may be executed by and on behalf of the Bank
on other than the date hereof.

         SECTION 13. WAIVER OF DEFENSES AND CLAIMS. In consideration of the
financial accommodations provided to the Borrower by the Bank as contemplated by
this Amendment No. 3, Borrower hereby waives, releases and forever discharges
the Bank from and against any and all rights, claims or causes of action against
the Bank arising under the Bank's actions or inactions with respect to the Loan
Documents or any security interest, lien or collateral in connection therewith
as well as any and all rights of set off, defenses, claims, causes of action and
any other bar to the enforcement of the Loan Documents which exist as of the
date hereof.

                                      -4-
<PAGE>   5

         IN WITNESS WHEREOF, COHESANT TECHNOLOGIES INC. and UNION PLANTERS BANK,
N.A. have caused this Amendment No. 3 to Credit and Security Agreement to be
executed by their respective duly authorized officers effective as of the 1st
day of April, 2001.

                                  COHESANT TECHNOLOGIES INC.

                                  ("Borrower")

                                  By:

                                  Printed:____________________________________

                                  Title:______________________________________

                                  UNION PLANTERS BANK, N.A.

                                  ("Bank")

                                  By:
                                        Janet K. Carter, Vice President

IM-335976-1

                                      -5-

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