Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 02/26/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,780,916        07/047,490        05/11/87        11/01/88       03/04/99
4,901,028        07/171,706        03/22/88        02/13/90       02/26/99
4,938,260        07/234,320        08/19/88        07/03/90       02/26/99
5,156,361        07/232,456        08/16/88        10/20/92       02/26/99
5,233,696        07/573,746        08/28/90        08/03/93       02/26/99
5,236,293        07/696,880        05/08/91        08/17/93       03/03/99
5,261,428        07/682,062        04/08/91        11/16/93       03/04/99
5,278,987        07/664,746        03/05/91        01/11/94       03/01/99
5,303,458        07/861,420        03/31/92        04/19/94       02/26/99
5,303,484        07/866,150        04/09/92        04/19/94       02/26/99
5,307,608        07/976,192        11/13/92        05/03/94       02/26/99
5,315,470        07/871,822        04/21/92        05/24/94       02/26/99
5,318,625        07/963,042        10/19/92        06/07/94       03/02/99
5,328,705        07/872,873        04/23/92        07/12/94       03/02/99
5,340,322        08/051,730        04/22/93        08/23/94       03/04/99
5,343,578        08/082,780        06/28/93        09/06/94       03/01/99