Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 11/06/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,565,599        06/680,237        12/10/84        01/21/86       11/10/98
4,596,258        06/611,941        05/18/84        06/24/86       11/12/98
4,769,760        07/025,523        03/13/87        09/06/88       11/12/98
4,818,695        07/080,217        07/31/87        04/04/89       11/09/98
4,862,727        07/205,830        06/13/88        09/05/89       11/10/98
5,012,231        07/287,102        12/20/88        04/30/91       11/09/98
5,133,073        07/529,962        05/29/90        07/21/92       11/12/98
5,134,504        07/679,909        04/03/91        07/28/92       11/12/98
5,140,856        07/621,316        12/03/90        08/25/92       11/09/98
5,231,529        07/811,300        12/19/91        07/27/93       11/10/98
5,263,811        07/806,675        12/13/91        11/23/93       11/09/98
5,286,034        07/917,230        07/23/92        02/15/94       11/10/98
5,307,930        07/917,596        07/23/92        05/03/94       11/10/98