EXHIBIT 10.4
                                   ASSIGNMENTS


<PAGE>
                                   ASSIGNMENT

WHEREAS,  I, Michael R. Bloom, of 417 West Skaro,  St. Peter,  Minnesota  56082,
have invented certain new and useful improvements in a gas centrifuge device and
method for which  United States Letters Patent and other  intellectual  property
protection may be available in the United States and in foreign  countries,  and
in which ongoing  inventive  efforts and development of additional  improvements
are being conducted by me (all hereinafter referred to as the "Invention"); and

WHEREAS,  Fuge Systems,  Inc., a corporation of the State of Texas, with offices
at 4516  Hitching  Post Lane,  Plano,  Texas 75024  (hereinafter  referred to as
"Assignee"), is desirous of acquiring my entire right, title and interest in and
to the Invention, and in and to the said application and any Letters Patent that
may issue thereon;

NOW,  THEREFORE,  effective as of November 8, 1995, for and in  consideration of
One Dollar  ($1.00) and other good and valuable  consideration,  the receipt and
sufficiency  of which are  hereby  acknowledged,  I do hereby  SELL,  ASSIGN and
TRANSFER unto said Assignee,  its successors,  assigns and legal representatives
the full and exclusive right, title and interest in and to said Invention and in
and to any applications and all patents which may be granted therefore,  and all
divisions,  reissues,  substitutions,  continuations,  continuations-in-part and
extensions thereof; and I hereby authorize and request the Commission of Patents
to issue all patents for said Invention, or patents resulting therefrom, insofar
as my interest is  concerned,  to said  Assignee of my entire  right,  title and
interest.

I also  hereby SELL and ASSIGN to said  Assignee,  its  successors,  assigns and
legal  representatives the full and exclusive rights, title and interest to said
Invention, including improvements,  throughout the world, including the right to
file  applications and obtain patents,   utility models,  industrial  models and
designs for said Invention in its own name  throughout the world,  including all
rights of priority, all rights to publish cautionary notices reserving ownership
of said  Invention  and all rights to register  said  Invention  in  appropriate
registries;  and I further  agree to  execute  any and all  powers of  attorney,
applications,  assignments,  declarations,  affidavits,  and any other papers in
connection  therewith  necessary to perfect  such rights,  title and interest in
Assignee, its successors, assigns and legal representatives.

I hereby  further  agree that I will  communicate  to said  Assignee,  or to its
successors, assigns and legal representatives,  any facts known to me respecting
any improvements;  and, at the expense of said Assignee, to testify in any legal
proceedings,  sign all lawful  papers,  execute  all  divisional,  continuation,
continuation-in-part,  reissue  and  substitute  applications,  make all  lawful
oaths,  and generally do everything  possible to vest title in said Assignee and
to aid said  Assignee,  its  successors,  assigns and legal  representatives  to
obtain and enforce proper protection for said Invention in all countries.


<PAGE>
IN WITNESS WHEREOF, I HAVE HEREUNTO SET MY HAND THIS 13TH day of May, 1996.

                                                     /S/MICHAEL R. BLOOM
                                                     Michael R. Bloom

STATE OF MINNESOTA                  )
                                    )ss.
COUNTY OF LASUER                    )

ON THIS 13TH day of May,  1996,  before me, a Notary Public in and for the State
and County aforesaid,  personally  appeared Michael R. Bloom,  known by me to be
the  person  of  the  above  name  who  signed  the  foregoing  instrument,  and
acknowledged the same to be his own free act and deed.

                                                /S/LYNN ANN KLUNTZ

                                                Notary Public
                                                My Commission Expires: 1/31/2000


<PAGE>
                                   ASSIGNMENT

WHEREAS, I, Michael R. Bloom, of 1110 Clifford Drive,  Kasota,  Minnesota 56050,
have invented certain new and useful improvements in a gas separation centrifuge
for which I have made  application  for United States Letters  Patent,  the said
application  having  been filed on March 14,  1997,  by me and  assigned  Serial
Number 08/819,583 (and I hereby authorize the attorney(s) and agent(s) of record
to insert  hereon the filing date and serial  number of said  application,  when
known); and

WHEREAS,  Fuge Systems,  Inc., a corporation of the State of Texas, with offices
at 4516  Hitching  Post Lane,  Plano,  Texas 75024  (hereinafter  referred to as
"Assignee"), is desirous of acquiring my entire right, title and interest in and
to the Invention, and in and to the said application and any Letters Patent that
may issue thereon;

NOW,  THEREFORE,  for and in  consideration of One Dollar ($1.00) and other good
and  valuable  consideration,  the receipt and  sufficiency  of which are hereby
acknowledged,  I do hereby SELL,  ASSIGN and TRANSFER  unto said  Assignee,  its
successors,  assigns and legal  representatives  the full and  exclusive  right,
title and interest in and to said Invention and in and to said  application  and
all  patents  which  may be  granted  therefor,  and  all  divisions,  reissues,
substitutions, continuations,  continuations-in-part and extensions thereof; and
I hereby  authorize and request the Commissioner of Patents to issue all patents
for said Invention,  or patents resulting  therefrom,  insofar as my interest is
concerned, to said Assignee of my entire right, title and interest.

I also  hereby SELL and ASSIGN to said  Assignee,  its  successors,  assigns and
legal  representatives the full and exclusive rights, title and interest to said
Invention  disclosed in said  application  throughout  the world,  including the
right to file applications and obtain patents, utility models, industrial models
and designs for said Invention in its own name  throughout the world,  including
all  rights of  priority,  all rights to publish  cautionary  notices  reserving
ownership  of said  Invention  and all  rights to  register  said  Invention  in
appropriate  registries;  and I further  agree to execute  any and all powers of
attorney,  applications,  assignments,  declarations,  affidavits, and any other
papers in  connection  therewith  necessary to perfect  such  rights,  title and
interest in Assignee, its successors, assigns and legal representatives.

I hereby  further  agree that I will  communicate  to said  Assignee,  or to its
successors, assigns and legal representatives,  any facts known to me respecting
any improvements;  and, at the expense of said Assignee, to testify in any legal
proceedings,  sign all lawful  papers,  execute  all  divisional,  continuation,
continuation-in-part,  reissue  and  substitute  applications,  make all  lawful
oaths,  and generally do everything  possible to vest title in said Assignee and
to aid said  Assignee,  its  successors,  assigns and legal  representatives  to
obtain and enforce proper protection for said Invention in all countries.


<PAGE>
IN WITNESS WHEREOF, I HAVE HEREUNTO SET MY HAND THIS 26TH day of March, 1997.

                                                     /S/MICHAEL R. BLOOM
                                                     Michael R. Bloom

STATE OF MINNESOTA                  )
                                    )ss.
COUNTY OF                           )

ON THIS 26TH day of March, 1997, before me, a Notary Public in and for the State
and County aforesaid,  personally  appeared Michael R. Bloom,  known by me to be
the  person  of  the  above  name  who  signed  the  foregoing  instrument,  and
acknowledged the same to be his own free act and deed.

                                                 /S/TIMOTHY J. GRASOW

                                                 Notary Public
                                                 My Commission Expires: 1/31/00