YEARLY PATENTS WHICH EXPIRED DUE TO
                        FAILURE TO PAY MAINTENANCE FEES

   The following is a compilation of the NOTICE OF EXPIRATION OF
PATENTS DUE TO FAILURE TO PAY MAINTENANCE FEES which have been published
in the Official Gazette from March 15, 1994 through March 7, 1995.
   The patents have issue dates in the range of Jan. 5, 1982 through Dec.
28, 1982, Dec. 31, 1985 through Dec. 23, 1986 and Jan. 2, 1990 through
Dec. 25, 1990.

Patent Number               Serial Number               Issue Date

Re. 31,748                   06/446,217                   11/27/84
(4,349,443)                 (06/239,079)                (09/14/82)
Re. 31,893                   06/513,799                   05/21/85
(4,355,100)                 (06/226,243)                (10/19/82)
Re. 31,938                   06/554,537                   07/09/85
(4,365,500)                 (06/230,281)                (12/28/82)
Re. 32,980                   07/128,529                   07/11/89
(4,630,519)                 (06/747,368)                (12/23/86)
Re. 31,951                   06/587,315                   07/16/85
(4,355,372)                 (06/220,140)                (10/19/82)
Re. 32,080                   06/640,865                   02/11/86
(4,360,255)                 (06/286,332)                (11/23/82)
Re. 32,159                   06/666,270                   05/27/86
(4,357,112)                 (06/217,584)                (11/02/82)
Re. 32,160                   06/663,069                   05/27/86
(4,354,893)                 (06/295,734)                (10/19/82)
Re. 32,180                   06/672,139                   06/10/86
(4,359,726)                 (06/228,716)                (11/16/82)
Re. 32,384                   06/673,442                   03/31/87
(4,359,960)                 (06/227,013)                (11/23/82)
Re. 32,397                   06/512,139                   04/14/87
(4,353,556)                 (06/228,734)                (10/12/82)
Re. 32,450                   06/916,992                   06/30/87
(4,587,459)                 (06/565,582)                (05/06/86)
Re. 32,473                   06/596,129                   08/11/87
(4,365,033)                 (06/279,634)                (12/21/82)
Re. 32,494                   06/937,662                   09/08/87
(4,605,185)                 (06/769,593)                (08/12/86)
Re. 32,497                   06/917,990                   09/08/87
(4,601,743)                 (06/729,680)                (07/22/86)
Re. 32,538                   07/011,557                   11/10/87
(4,624,050)                 (06/776,972)                (11/25/86)
Re. 32,572                   06/947,020                   01/05/88
(4,601,777)                 (06/719,410)                (07/22/86)
Re. 32,576                   06/925,673                   01/12/88
(4,588,267)                 (06/571,820)                (05/13/86)
Re. 32,581                   06/634,472                   01/19/88
(4,321,268)                 (06/222,679)                (03/23/82)
Re. 32,581                   06/634,472                   01/19/88
(4,321,268)                 (06/222,679)                (03/23/82)
Re. 32,603                   07/029,165                   02/16/88
(4,610,832)                 (06/654,391)                (09/09/86)
Re. 32,609                   07/004,384                   02/23/88
(4,606,836)                 (06/693,664)                (08/19/86)
Re. 32,628                   06/934,459                   03/22/88
(4,607,069)                 (06/751,389)                (08/19/86)
Re. 32,668                   06/927,549                   05/17/88
(4,570,805)                 (06/663,388)                (02/18/86)
Re. 32,676                   07/059,254                   05/24/88
(4,617,303)                 (06/662,592)                (10/14/86)
Re. 32,688                   07/053,250                   06/07/88
(4,617,733)                 (06/791,471)                (10/21/86)
Re. 32,793                   07/075,356                   11/29/88
(4,623,860)                 (06/747,923)                (11/18/86)
Re. 32,802                   07/071,734                   12/20/88
(4,616,605)                 (06/688,070)                (10/14/86)
Re. 32,814                   07/058,261                   01/03/89
(4,590,765)                 (06/633,462)                (05/27/86)
Re. 32,853                   07/089,440                   01/31/89
(4,609,894)                 (06/653,846)                (09/02/86)
Re. 32,857                   07/048,959                   02/07/89
(4,605,889)                 (06/642,992)                (08/12/86)
Re. 32,866                   06/936,537                   02/14/89
(4,580,634)                 (06/591,626)                (04/08/86)
Re. 32,879                   07/162,294                   02/28/89
(4,572,388)                 (06/713,327)                (02/25/86)
Re. 32,904                   07/204,421                   04/11/89
(4,613,934)                 (06/637,916)                (09/23/86)
Re. 32,924                   07/102,436                   05/16/89
(4,610,644)                 (06/579,965)                (09/09/86)
Re. 32,965                   07/076,464                   06/27/89
(4,587,940)                 (06/730,617)                (05/13/86)
Re. 32,974                   07/108,768                   07/04/89
(4,583,978)                 (06/571,192)                (04/22/86)
Re. 32,988                   07/201,495                   07/18/89
(4,592,627)                 (06/593,003)                (06/03/86)
Re. 32,991                   07/223,896                   07/18/89
(4,614,787)                 (06/670,810)                (09/30/86)
Re. 32,996                   07/132,210                   07/25/89
(4,582,271)                 (06/518,235)                (04/15/86)
Re. 33,011                   06/943,560                   08/08/89
(4,614,341)                 (06/632,453)                (09/30/86)
Re. 33,027                   07/178,903                   08/22/89
(4,580,535)                 (06/740,226)                (04/08/96)
Re. 33,033                   07/098,171                   08/22/89
(4,611,081)                 (06/752,323)                (09/09/86)
Re. 33,071                   07/140,659                   09/26/89
(4,590,001)                 (06/593,725)                (05/20/86)
Re. 33,075                   07/277,278                   10/03/89
(4,625,545)                 (06/720,037)                (12/02/86)
Re. 33,080                   06/896,229                   10/03/89
(4,357,484)                 (06/298,118)                (11/02/82)
Re. 33,096                   07/171,370                   10/17/89
(4,576,851)                 (06/723,708)                (03/18/86)
Re. 33,096                   07/171,370                   10/17/89
(4,576,851)                 (06/723,708)                (03/18/86)
Re. 33,101                   07/184,283                   10/24/89
(4,600,548)                 (06/457,009)                (07/15/86)
Re. 33,114                   07/247,751                   11/21/89
(4,616,535)                 (06/754,064)                (10/14/86)
Re. 33,155                   07/179,408                   01/30/90
(4,581,071)                 (06/708,651)                (04/08/86)
Re. 33,162                   07/141,304                   02/13/90
(4,563,746)                 (06/439,908)                (01/07/86)
Re. 33,165                   07/238,558                   02/13/90
(4,609,360)                 (06/630,300)                (09/02/86)
Re. 33,168                   07/214,932                   02/20/90
(4,621,157)                 (06/607,794)                (11/04/86)
Re. 33,183                   07/166,479                   03/20/90
(4,613,786)                 (06/659,543)                (09/23/86)
Re. 33,194                   07/239,694                   04/10/90
(4,608,970)                 (06/711,571)                (09/02/86)
Re. 33,196                   07/238,537                   04/10/90
(4,611,708)                 (06/680,070)                (09/16/86)
Re. 33,217                   07/235,787                   05/15/90
(4,577,774)                 (06/711,010)                (03/25/86)
Re. 33,223                   07/144,801                   05/29/90
(4,568,485)                 (06/651,625)                (02/04/86)
Re. 33,238                   07/036,169                   06/26/90
(4,351,396)                 (06/229,925)                (09/28/82)
Re. 33,243                   07/296,714                   06/26/90
(4,617,158)                 (06/484,419)                (10/14/86)
Re. 33,270                   07/284,472                   07/24/90
(4,628,881)                 (06/700,692)                (12/16/86)
Re. 33,272                   07/372,055                   07/24/90
(4,619,676)                 (06/678,282)                (10/28/86)
Re. 33,279                   07/315,242                   07/31/90
(4,587,499)                 (06/539,780)                (05/06/86)
Re. 33,281                   07/276,426                   07/31/90
(4,611,099)                 (06/666,836)                (09/09/86)
Re. 33,293                   07/195,854                   08/07/90
(4,589,767)                 (06/777,028)                (05/20/86)
Re. 33,303                   07/099,165                   08/21/90
(4,625,947)                 (06/627,029)                (12/02/86)
Re. 33,317                   07/223,687                   08/28/90
(4,566,727)                 (06/672,861)                (01/28/86)
Re. 33,336                   07/200,957                   09/18/90
(4,627,301)                 (06/713,284)                (12/09/86)
Re. 33,343                   07/141,918                   09/18/90
(4,565,919)                 (06/620,687)                (01/21/86)
Re. 33,347                   07/216,952                   09/25/90
(4,598,632)                 (06/428,889)                (07/08/86)
Re. 33,358                   07/231,222                   10/02/90
(4,604,842)                 (06/706,489)                (08/12/86)
Re. 33,362                   07/157,439                   10/02/90
(4,569,469)                 (06/701,970)                (02/11/86)
Re. 33,378                   07/352,158                   10/09/90
(4,609,832)                 (06/542,147)                (09/02/86)
Re. 33,445                   07/334,762                   11/20/90
(4,584,033)                 (06/749,782)                (04/22/86)
Re. 33,490                   07/272,719                   12/18/90
(4,622,730)                 (06/704,967)                (11/18/86)
Re. 33,504                   07/216,764                   12/25/90
(4,563,592)                 (06/541,368)                (01/07/86)
Re. 33,514                   07/104,004                   01/08/91
(4,610,339)                 (06/790,789)                (09/09/86)
Re. 33,526                   07/376,211                   01/29/91
(4,579,025)                 (06/629,421)                (04/01/86)
Re. 33,539                   07/272,525                   02/19/91
(4,623,076)                 (06/708,157)                (11/18/86)
Re. 33,549                   07/004,173                   03/05/91
(4,593,124)                 (06/649,711)                (06/03/86)
Re. 33,633                   07/342,693                   07/09/91
(4,589,053)                 (06/618,248)                (05/13/86)
Re. 33,680                   07/244,032                   09/03/91
(4,613,157)                 (06/514,937)                (09/23/86)
Re. 33,725                   07/179,609                   10/22/91
(4,584,493)                 (06/658,000)                (04/22/86)
Re. 33,768                   07/516,464                   12/17/91
(4,629,435)                 (06/777,193)                (12/16/86)
Re. 33,844                   07/267,709                   03/10/92
(4,571,057)                 (06/493,007)                (02/18/86)
Re. 33,849                   07/559,220                   03/17/92
(4,893,229)                 (07/242,725)                (01/09/90)
Re. 33,851                   07/661,336                   03/17/92
(4,962,568)                 (07/383,789)                (10/16/90)
Re. 33,86                    07/454,860                   03/31/92
(4,564,102)                 (06/547,133)                (01/14/86)
Re. 33,892                   07/629,837                   04/21/92
(4,913,770)                 (07/278,824)                (04/03/90)
Re. 33,894                   07/401,725                   04/21/92
(Re. 32,201)                (06/638,340)                (07/08/86)
Re. 33,960                   07/706,012                   06/16/92
(4,891,626)                 (07/298,031)                (01/02/90)
Re. 33,981                   07/576,684                   06/30/92
(4,903,581)                 (07/201,123)                (02/27/90)
Re. 33,986                   07/173,937                   07/07/92
(4,596,682)                 (06/609,482)                (06/24/86)
Re. 33,995                   07/611,406                   07/14/92
(4,925,753)                 (07/250,109)                (05/15/90)
Re. 34,017                   07/248,629                   08/04/92
(4,613,165)                 (06/732,703)                (09/23/86)
Re. 34,053                   07/599,344                   09/01/92
(4,911,577)                 (07/361,400)                (03/27/90)
Re. 34,071                   07/706,024                   09/22/92
(4,938,289)                 (07/274,192)                (07/03/90)
Re. 34,073                   07/637,572                   09/22/92
(4,896,099)                 (07/284,040)                (01/23/90)
Re. 34,098                   07/718,213                   10/13/92
(4,969,681)                 (07/481,818)                (11/13/90)
Re. 34,117                   07/605,077                   10/27/92
(4,927,405)                 (07/214,520)                (05/22/90)
Re. 34,141                   07/739,332                   12/08/92
(4,975,478)                 (07/388,799)                (12/04/90)
Re. 34,171                   07/719,077                   02/02/93
(4,616,890)                 (06/691,272)                (10/14/86)
Re. 34,194                   07/710,466                   03/16/93
(4,974,286)                 (07/498,729)                (12/04/90)
Re. 34,214                   07/288,287                   04/06/93
(4,631,581)                 (06/703,842)                (12/23/86)
Re. 34,226                   07/713,405                   04/20/93
(4,972,807)                 (07/357,473)                (11/27/90)
Re. 34,232                   07/780,030                   04/27/93
(4,930,452)                 (07/396,102)                (06/05/90)
Re. 34,240                   07/686,513                   05/04/93
(4,890,871)                 (07/272,383)                (01/02/90)
Re. 34,263                   07/809,271                   05/25/93
(4,969,572)                 (07/389,581)                (11/13/90)
Re. 34,266                   07/647,701                   06/01/93
(4,590,866)                 (06/580,804)                (05/27/86)
Re. 34,270                   07/783,831                   06/01/93
(4,899,237)                 (07/366,366)                (02/06/90)
Re. 34,279                   07/878,289                   06/08/93
(4,569,960)                 (06/635,446)                (02/11/86)
Re. 34,313                   07/769,492                   07/13/93
(4,587,240)                 (06/651,772)                (05/06/86)
Re. 34,317                   07/798,064                   07/20/93
(4,567,488)                 (06/520,270)                (01/28/86)
Re. 34,333                   07/805,092                   08/03/93
(4,890,883)                 (07/276,917)                (01/02/90)
Re. 34,340                   07/869,792                   08/10/93
(4,918,516)                 (07/113,017)                (04/17/90)
Re. 34,358                   07/818,641                   08/31/93
(4,976,031)                 (07/360,076)                (12/11/90)
Re. 34,370                   07/652,752                   09/07/93
(4,901,278)                 (07/054,977)                (02/13/90)
Re. 34,379                   07/744,112                   09/14/93
(4,928,283)                 (07/160,657)                (05/22/90)
Re. 34,382                   07/894,513                   09/21/93
(4,955,510)                 (07/342,247)                (09/11/90)
Re. 34,407                   07/843,950                   10/12/93
(4,905,987)                 (07/265,318)                (03/06/90)
Re. 34,414                   07/693,107                   10/19/93
(4,569,943)                 (06/543,943)                (02/11/86)
Re. 34,418                   07/164,432                   10/26/93
(4,575,393)                 (06/629,782)                (03/11/86)
Re. 34,429                   07/817,733                   11/02/93
(4,893,333)                 (07/323,282)                (01/09/90)
Re. 34,431                   07/915,381                   11/02/93
(4,980,453)                 (07/146,154)                (12/25/90)
Re. 34,432                   07/841,433                   11/02/93
(4,901,720)                 (07/224,301)                (02/20/90)
Re. 34,433                   07/700,244                   11/09/93
(4,922,574)                 (07/342,523)                (05/08/90)
Re. 34,442                   07/851,302                   11/16/93
(4,909,858)                 (07/221,417)                (03/20/90)
Re. 34,442                   07/851,302                   11/16/93
(4,909,858)                 (07/221,417)                (03/20/90)
Re. 34,448                   07/586,752                   03/31/92
(4,894,062)                 (07/279,439)                (01/16/90)
Re. 34,458                   07/826,985                   11/30/93
(4,896,835)                 (07/374,603)                (01/30/90)
Re. 34,460                   07/835,377                   11/30/93
(4,901,994)                 (07/216,701)                (02/20/90)
Re. 34,469                   07/615,037                   12/07/93
(4,938,571)                 (07/207,496)                (07/03/90)
Re. 34,480                   07/940,309                   12/14/93
(4,622,179)                 (06/631,700)                (11/11/86)
Re. 34,485                   07/891,844                   12/21/93
(4,929,221)                 (07/280,589)                (05/29/90)
Re. 34,492                   07/807,792                   12/28/93
(4,950,059)                 (07/256,019)                (08/21/90)
Re. 34,504                   07/597,906                   01/11/94
(4,901,143)                 (07/311,510)                (02/13/90)
Re. 34,507                   07/873,502                   01/11/94
(4,932,789)                 (07/335,616)                (06/12/90)
Re. 34,519                   07/815,235                   01/25/94
(4,892,244)                 (07/267,907)                (01/09/90)
Re. 34,521                   07/865,022                   01/25/94
(4,915,516)                 (07/222,428)                (04/10/90)
Re. 34,529                   07/824,952                   02/01/94
(4,896,350)                 (07/329,918)                (01/23/90)
Re. 34,532                   07/892,147                   02/01/94
(4,934,962)                 (07/395,991)                (06/19/90)
Re. 34,533                   07/775,423                   02/08/94
(4,903,494)                 (07/396,092)                (02/27/90)
Re. 34,535                   07/541,435                   02/08/94
(4,613,956)                 (06/469,075)                (09/23/86)
Re. 34,538                   07/696,846                   02/08/94
(4,925,734)                 (07/191,785)                (05/15/90)
Re. 34,545                   07/749,976                   02/15/94
(4,903,636)                 (07/066,952)                (02/27/90)
Re. 34,546                   07/947,851                   02/15/94
(4,973,625)                 (07/100,191)                (11/27/90)
Re. 34,551                   07/886,230                   02/22/94
(4,927,324)                 (07/294,780)                (05/22/90)
Re. 34,554                   07/804,979                   03/01/94
(4,892,414)                 (07/308,932)                (01/09/90)
Re. 34,560                   07/927,064                   03/08/94
(4,946,291)                 (07/251,020)                (08/07/90)
Re. 34,561                   07/816,028                   03/15/94
(4,890,573)                 (07/223,630)                (01/02/90)
Re. 34,563                   07/883,955                   03/15/94
(4,925,910)                 (07/036,446)                (05/15/90)