Document:

<PAGE>   1

                                                                    EXHIBIT 4.14

                                PATENT ASSIGNMENT

         WHEREAS, Tidel Engineering, Inc., a Delaware corporation located at
2310 McDaniel Drive, Carrollton, Texas 75006 merged with and into Tidel
Engineering, L.P. as of March 31, 1999, and is record owner of the patents
described on Exhibit A attached (the "Patents"); and

         WHEREAS, Tidel Engineering, L.P., a limited partnership organized and
existing under the laws of the State of Delaware and having offices at 2310
McDaniel Drive, Carrollton, Texas 75006 ("Assignee") is desirous of acquiring,
pursuant to the merger of the Assignor into the Assignee, the entire right,
title and interest in and to the Patents;

         NOW, THEREFORE, for good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the undersigned transfers to
Assignee, its successors and assigns, its entire right, title and interest in
and to the Patents and all rights and benefits under any applicable law, treaty
or convention; and the undersigned authorizes the Commissioner of Patents and
Trademarks of the United States or foreign equivalent thereof to issue the
Letters Patent or similar legal protection to the Assignee.

         The undersigned authorizes the Assignee, its successors and assigns, to
insert in this instrument the filing date and serial number of the application
when ascertained.

         The undersigned authorizes the Assignee, its successors and assigns, or
anyone it may properly designate, to apply for Letters Patent or similar legal
protection, in its own name if desired, in any and all foreign countries.

         The undersigned represents to the Assignee, its successors and assigns,
that it has not and shall not execute any writing or do any act whatsoever
conflicting with this Assignment and that it will at any time upon request,
without additional consideration, but at the expense of the Assignee, its
successors and assigns, execute such additional writings and do such additional
acts as the Assignee, its successors and assigns, may deem desirable to perfect
its enjoyment of this grant, and render all assistance in making application for
and obtaining, maintaining, and enforcing the Letters Patent or similar legal
protection on the invention in any and all countries.

                                       1
<PAGE>   2

         Executed effective as of March 31, 1999.

                                    ASSIGNOR:

                                    TIDEL ENGINEERING, INC.

                                    By:
                                        ----------------------------------------
                                        Mark K. Levenick, President

THE STATE OF TEXAS

COUNTY OF DALLAS

         BEFORE ME, _____________________ on this day personally appeared MARK
K. LEVENICK, known to me or proved to me on the oath of MARK K. LEVENICK or
through ______________ (description or identity card or other documents) to be
the person whose name is subscribed to the foregoing instrument and acknowledged
to me that he executed the same for the purposes and consideration therein
expressed.

      GIVEN UNDER MY HAND AND SEAL OF OFFICE this ____ day of April, A.D., 1999.

                                          --------------------------------------
                                          Notary Public, State of Texas

My Commission Expires:

                                          --------------------------------------
                                          Typed/Printed Name of Notary

                                       2

<PAGE>   3

                                   SCHEDULE 1
                                    TO PATENT
                               SECURITY AGREEMENT
                               ------------------

                              PATENT REGISTRATIONS
                              --------------------

<TABLE>
<CAPTION>
      PATENT NO.        ISSUE DATE                TITLE                            PATENT EXPIRES
      ----------        ----------                -----                            --------------
<S>   <C>               <C>         <C>                                            <C>
1.    4,877,235          10/31/89   Currency Sorter and Storage Device             October 31, 2006

2.    5,095,748           3/17/92   Sonic Tank Monitoring System                   March 17, 2009

3.    5,220,157           6/15/93   Scrip Controlled Cash Dispensing System        June 15, 2010

4.    5,340,967           8/23/94   Method for Storing and Dispensing Cash         August 23, 2011

5.    5,508,500           4/16/96   Method for Storing and Dispensing Cash         April 16, 2013

</TABLE>

                                 FOREIGN PATENTS
                                 ---------------
<TABLE>
<CAPTION>
      PATENT NO.        ISSUE DATE                TITLE                            PATENT EXPIRES
      ----------        ----------                -----                            --------------
<S>   <C>               <C>         <C>                                            <C>
1.    180049             11/9/95    Mexican counterpart to No. 2 above             August 5, 2011
                                                                                   (Annuities paid
                                                                                   through 11/9/00)
</TABLE>

                              PATENT APPLICATIONS
                              -------------------

                                      NONE

                                PATENT LICENSES
                                ---------------

                                      NONE

                                       3<PAGE>   1
                                                                    EXHIBIT 4.15

                            PATENT SECURITY AGREEMENT

         WHEREAS, TIDEL ENGINEERING, L.P., a Delaware limited partnership
("Grantor"), owns the patents, patent registrations, and patent applications
listed on Schedule 1 annexed hereto, and is a party to, or has been assigned the
rights by the party to, the patent licenses listed on Schedule 1 annexed hereto;
and

         WHEREAS, Grantor, Chase Bank of Texas, N.A., a national banking
association ("Grantee"), and Tidel Technologies, Inc., a Delaware corporation,
are parties to that certain Credit Agreement dated as of the date hereof (as
heretofore or hereafter amended, modified and in effect from time to time, the
"Loan Agreement"), providing for extensions of credit to be made by Grantee to
Grantor; and

         WHEREAS, pursuant to the terms of the Security Agreement (as defined in
the Loan Agreement), Grantor has granted to Grantee a security interest in all
of the assets of Grantor including all right, title and interest of Grantor in,
to and under all now owned and hereafter acquired patents and patent
applications, and all products and proceeds thereof, to secure the payment of
all amounts owing by Grantor under the Loan Agreement including, without
limitation, all the Obligations (as defined in the Loan Agreement);

         NOW, THEREFORE, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, Grantor does hereby grant to
Grantee a continuing security interest in all of Grantor's right, title and
interest in, to and under the following (all of the following items or types of
property being herein collectively referred to as the "Patent Collateral"),
whether presently existing or hereafter created or acquired:

                  (1) each patent, patent registration and patent application,
                  including, without limitation, the patents, patent
                  registrations (together with any reissues, continuations or
                  extensions thereof) and patent applications referred to in
                  Schedule 1 annexed hereto;

                  (2) each patent license, including, without limitation, each
                  patent license listed on Schedule 1 annexed hereto; and

                  (3) all products and proceeds of the foregoing, including,
                  without limitation, any claim by Grantor against third parties
                  for past, present or future infringement of any patent or
                  patent registration including, without limitation, the patents
                  and patent registrations referred to in Schedule 1 annexed
                  hereto, the patent registrations issued with respect to the
                  patent applications referred in Schedule 1 and the patents
                  licensed under any patent license.

This security interest is granted in conjunction with the security interests
granted to Grantee pursuant to the Loan Agreement. Grantor hereby acknowledges
and affirms that the rights and remedies of Grantee with respect to the security
interest in the Patent Collateral made and granted hereby are

PATENT SECURITY AGREEMENT - Page 1

<PAGE>   2

more fully set forth in the Loan Agreement, the terms and provisions of which
are incorporated by reference herein as if fully set forth herein.

         This Patent Security Agreement is given in renewal, amendment,
replacement, and restatement in its entirety (but not in novation,
extinguishment or satisfaction) of that certain Patent Security Agreement dated
June 12, 1997, executed by Tidel Engineering, Inc., for the benefit of Grantee,
successor-in-interest to Texas Commerce Bank National Association (the "Prior
Agreement"). To the extent of any conflict between the terms of this Patent
Security Agreement and the terms of the Prior Agreement, the terms of this
Patent Security Agreement shall control.

         IN WITNESS WHEREOF, Grantor has caused this Patent Security Agreement
to be duly executed by its duly authorized officer thereunto as of the 1st day
of April, 1999.

                               GRANTOR:

                               TIDEL ENGINEERING, L.P.,
                               a Delaware limited partnership

                               By: Tidel Cash Systems, Inc., its general partner

                                   By:
                                      ------------------------------------------
                                      Mark K. Levenick, President and Chief
                                         Executive Officer

Acknowledged, agreed and accepted as
of the date hereof:

GRANTEE:

CHASE BANK OF TEXAS, N.A.

By:
   -----------------------------------
   Joanne Bramanti,
   Vice President

PATENT SECURITY AGREEMENT - Page 2

<PAGE>   3

                                 ACKNOWLEDGMENT

STATE OF TEXAS     )
                   )       ss.
COUNTY OF DALLAS   )

         On the _____ day of _______, 1999 before me personally appeared Mark K.
Levenick, to me personally known or proved to me on the basis of satisfactory
evidence to be the person described in and who executed the foregoing instrument
as the President and Chief Executive Officer of Tidel Cash Systems, Inc., the
general partner of Tidel Engineering, L.P., who being by me duly sworn, did
depose and say that he is the President and Chief Executive Officer of Tidel
Cash Systems, Inc., the corporation which executed the foregoing instrument;
that he signed the said instrument on behalf of said corporation and limited
partnership; and that he acknowledged said instrument to be the free act and
deed of said corporation.

                                        ----------------------------------------
                                                     Notary Public

         [Seal]

My commission expires:

----------------------------------------

PATENT SECURITY AGREEMENT - Page 3

<PAGE>   4

                                   SCHEDULE 1
                                    TO PATENT
                               SECURITY AGREEMENT

                              PATENT REGISTRATIONS

<TABLE>
<CAPTION>
    PATENT NO.       ISSUE DATE           TITLE                                              PATENT EXPIRES
    ----------       ----------           -----                                              --------------

<S>                  <C>            <C>                                                      <C>
1.   4,877,235        10/31/89      Currency Sorter and Storage Device                       July 14, 2008

2.   5,095,748        3/17/92       Sonic Tank Monitoring System                             March 17, 2010

3.   5,220,157        6/15/93       Scrip Controlled Cash Dispensing System                  September 24, 2011

4.   5,340,967        8/23/94       Method for Storing and Dispensing Cash                   September 24, 2011

5.   5,508,500        4/16/96       Method for Storing and Dispensing Cash                   September 24, 2011
</TABLE>

                                 FOREIGN PATENTS

<TABLE>
<CAPTION>
    PATENT NO.       ISSUE DATE           TITLE                                              PATENT EXPIRES
    ----------       ----------           -----                                              --------------

<S>                  <C>            <C>                                                      <C>
1.   180049           11/9/95       Mexican counterpart to No. 2 above                       August 5, 2011
                                                                                             (Annuities paid
                                                                                             through 11/9/00)
</TABLE>

                               PATENT APPLICATIONS

                                      NONE

                                 PATENT LICENSES

                                      NONE

Schedule 1-1

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