Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 04/24/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

RE32,744         07/045,017        09/24/86        09/06/88       04/27/98
4,509,346        06/541,674        10/13/83        04/09/85       04/30/98
4,515,734        06/461,847        01/28/83        05/07/85       04/28/98
4,528,200        06/485,201        04/15/83        07/09/85       04/27/98
4,538,482        06/433,220        10/07/82        09/03/85       04/28/98
4,550,452        06/575,072        01/30/84        11/05/85       04/28/98
4,560,824        06/731,423        05/07/85        12/24/85       04/30/98
4,565,270        06/454,890        12/30/82        01/21/86       04/28/98
4,723,733        06/853,124        04/17/86        02/09/88       04/30/98
4,733,737        06/770,729        08/29/85        03/29/88       04/30/98
4,738,175        06/813,121        12/24/85        04/19/88       04/30/98
4,740,777        06/944,216        12/22/86        04/26/88       04/29/98
4,764,144        06/892,277        08/04/86        08/16/88       04/29/98
4,788,156        06/911,270        09/24/86        11/29/88       04/27/98
4,802,387        06/934,102        11/24/86        02/07/89       04/28/98
4,809,850        07/174,192        03/28/88        03/07/89       04/28/98
4,819,986        07/217,823        07/12/88        04/11/89       04/30/98
4,850,272        07/163,822        02/22/88        07/25/89       04/30/98
4,870,966        07/150,594        02/01/88        10/03/89       04/28/98
4,874,381        07/211,229        06/24/88        10/17/89       04/30/98
4,880,638        07/235,378        08/23/88        11/14/89       04/29/98
4,884,363        07/281,921        12/05/88        12/05/89       04/30/98
4,896,967        07/167,682        03/11/88        01/30/90       04/30/98
4,901,261        07/265,110        10/31/88        02/13/90       04/24/98
4,908,814        07/135,029        10/06/87        03/13/90       04/29/98
4,910,242        07/230,802        08/10/88        03/20/90       04/24/98
5,087,048        07/552,089        07/13/90        02/11/92       04/29/98
5,093,400        07/453,174        12/26/89        03/03/92       04/29/98
5,099,888        07/532,322        06/04/90        03/31/92       04/30/98
5,105,034        07/529,487        05/29/90        04/14/92       04/29/98
5,124,141        07/538,126        06/14/90        06/23/92       04/30/98
5,129,756        07/577,456        09/04/90        07/14/92       04/29/98
5,141,758        07/791,183        11/13/91        08/25/92       04/30/98
5,143,589        07/648,328        01/29/91        09/01/92       04/30/98
5,157,089        07/699,439        05/13/91        10/20/92       04/29/98
5,159,660        07/596,056        10/11/90        10/27/92       04/28/98
5,165,066        07/782,894        10/22/91        11/17/92       04/28/98
5,168,638        07/512,763        04/20/90        12/08/92       04/30/98
5,173,346        07/540,576        06/18/90        12/22/92       04/29/98
5,180,516        07/727,022        07/08/91        01/19/93       04/30/98
5,190,681        07/715,692        06/17/91        03/02/93       04/28/98
5,195,828        07/851,064        03/13/92        03/23/93       04/30/98
5,204,259        07/344,237        04/26/89        04/20/93       04/27/98
5,241,110        07/727,700        07/10/91        08/31/93       04/28/98
5,241,285        07/770,515        10/03/91        08/31/93       04/29/98
5,261,875        07/818,045        01/08/92        11/16/93       04/29/98
5,261,911        07/911,105        07/09/92        11/16/93       04/24/98
5,268,183        07/519,395        05/04/90        12/07/93       04/29/98
5,275,553        07/881,181        05/11/92        01/04/94       04/30/98
5,278,048        07/708,121        05/29/91        01/11/94       04/28/98
5,280,791        07/963,057        10/19/92        01/25/94       04/28/98
5,285,873        07/836,898        02/19/92        02/15/94       04/30/98
5,292,447        07/946,227        09/18/92        03/08/94       04/30/98