Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 2/07/97

Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

Re. 34,248       07/552,800        07/13/90        05/11/93        02/10/97
4,466,346        06/329,662        12/11/81        08/21/84        02/12/97
4,638,188        06/644,249        08/27/84        01/20/87        02/10/97
4,759,514        06/913,275        09/30/86        07/26/88        02/10/97
4,922,376        07/335,802        04/10/89        05/01/90        02/12/97
4,929,519        07/383,376        07/20/89        05/29/90        02/12/97
4,951,439        07/294,747        01/09/89        08/28/90        02/10/97
4,961,290        06/777,217        09/18/85        10/09/90        02/12/97
5,043,437        07/425,197        08/18/89        08/27/91        02/12/97
5,128,342        07/561,173        08/01/90        07/07/92        02/07/97
5,140,718        07/623,692        12/07/90        08/25/92        02/12/97
5,150,401        07/621,476        12/04/90        09/22/92        02/12/97
5,216,387        07/757,075        09/10/91        06/01/93        02/11/97

                 Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 2/14/97

Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

4,619,845        06/704,117        02/22/85        10/28/86        02/18/97
4,998,621        07/526,829        05/22/90        03/12/91        02/20/97
5,034,183        07/355,930        05/23/89        07/23/91        02/20/97
5,078,716        07/522,264        05/11/90        01/07/92        02/21/97
5,100,051        07/646,098        01/25/91        03/31/92        02/21/97
5,116,371        07/549,096        07/06/90        05/26/92        02/21/97
5,144,797        07/633,300        12/24/90        09/08/92        02/21/97
5,155,811        07/304,662        01/31/89        10/13/92        02/21/97