Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 5/23/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,448,357        06/355,794        03/08/82        05/15/84       05/29/97
4,669,239        06/828,457        02/12/86        06/02/87       05/28/97
4,714,122        06/922,064        10/20/86        12/22/87       05/28/97
4,714,860        06/696,460        01/30/85        12/22/87       05/29/97
4,723,766        06/913,980        10/01/86        02/09/88       05/29/97
4,768,819        07/129,043        12/07/87        09/06/88       05/28/97
4,789,488        07/088,991        08/21/87        12/06/88       05/27/97
4,980,172        07/452,692        12/19/89        12/25/90       05/28/97
5,129,756        07/577,456        09/04/90        07/14/92       05/28/97
5,152,823        07/641,068        01/14/91        10/06/92       05/28/97
5,153,345        07/599,662        10/18/90        10/06/92       05/28/97
5,181,347        07/732,466        07/18/91        01/26/93       05/28/97


                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 5/30/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,465,191        06/388,312        06/14/82        08/14/84       06/02/97
4,482,385        06/509,677        06/30/83        11/13/84       05/30/97
4,625,671        06/594,464        03/28/84        12/02/86       05/30/97
4,661,706        06/705,201        02/25/85        04/28/87       06/03/97
4,689,707        06/867,161        05/27/86        08/25/87       06/05/97
4,694,122        06/835,978        03/04/86        09/15/87       05/30/97
4,743,556        07/050,112        05/15/87        05/10/88       06/02/97
4,764,881        06/827,407        02/10/86        08/16/88       06/02/97
4,800,438        07/129,980        12/08/87        01/24/89       06/06/97
4,816,830        07/095,683        09/14/87        03/28/89       05/30/97
4,995,872        07/416,983        10/04/89        02/26/91       05/30/97
5,018,368        07/420,282        10/12/89        05/28/91       05/30/97
5,057,385        07/627,406        12/14/90        10/15/91       06/03/97
5,109,140        07/509,215        04/16/90        04/28/92       06/02/97
5,127,978        07/527,871        05/24/90        07/07/92       05/30/97
5,145,741        07/665,574        02/28/91        09/08/92       05/30/97
5,161,116        07/316,375        02/27/89        11/03/92       06/05/97
5,165,127        07/824,606        01/23/92        11/24/92       06/02/97
5,165,317        07/536,659        06/20/90        11/24/92       05/30/97
5,186,877        07/782,573        10/25/91        02/16/93       05/30/97
5,198,659        07/867,726        03/23/92        03/30/93       06/05/97