Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 9/18/98
   
Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

Re. 32,638       06/839,040        03/12/86        04/12/88        09/24/98
Re. 33,835       07/605,559        10/29/90        03/03/92        09/24/98
Re. 34,978       08/001,244        01/21/93        06/27/95        09/24/98
4,477,643        06/602,256        04/20/84        10/16/84        09/22/98
4,564,852        06/767,053        08/16/85        01/14/86        09/23/98
4,580,412        06/780,643        09/26/85        04/08/86        09/23/98
4,746,042        06/866,131        05/21/86        05/24/88        09/23/98
4,748,845        07/112,241        10/21/87        06/07/88        09/23/98
4,790,155        06/932,020        11/18/86        12/13/88        09/21/98
4,794,811        06/891,860        07/30/86        01/03/89        09/21/98
4,816,665        07/082,806        08/06/87        03/28/89        09/18/98
5,830,562        07/056,063        06/01/87        05/16/89        09/23/98
5,844,901        07/195,458        05/16/88        07/04/89        09/23/98
4,888,459        06/943,563        12/18/86        12/19/89        09/24/98
4,891,822        07/283,248        01/30/89        01/02/90        09/22/98
4,893,329        07/246,980        09/20/88        01/09/90        09/23/98
4,893,791        07/241,530        09/07/88        01/16/90        09/22/98
4,893,794        07/250,688        09/22/88        01/16/90        09/22/98
4,894,285        07/127,715        12/02/87        01/16/90        09/18/98
4,898,311        07/182,908        04/18/88        02/06/90        09/23/98
4,899,402        07/251,160        09/29/88        02/13/90        09/23/98
4,900,620        07/254,081        10/06/88        02/13/90        09/23/98
4,908,758        07/133,959        12/17/87        03/13/90        09/23/98
4,908,897        07/309,705        02/13/89        03/20/90        09/23/98
4,911,333        07/188,270        04/29/88        03/27/90        09/18/98
5,106,829        07/587,466        09/19/90        04/21/92        09/18/98
5,157,424        07/582,362        09/14/90        10/20/92        09/22/98
5,170,209        07/658,647        02/20/91        12/08/92        09/22/98
5,171,498        07/668,827        03/13/91        12/15/92        09/22/98
5,245,940        07/913,033        07/14/92        09/21/93        09/21/98
5,257,657        07/910,249        07/08/92        11/02/93        09/21/98
5,292,507        07/945,437        09/14/92        03/08/94        09/21/98
5,309,055        08/033,654        03/16/93        05/03/94        09/24/98
5,309,117        08/005,692        01/19/93        05/03/94        09/23/98
5,311,454        08/014,691        02/08/93        05/10/94        09/23/98
5,313,056        08/103,494        08/06/93        05/17/94        09/23/98