Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 03/05/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,881,690        07/232,095        08/15/88        11/21/89       03/09/99
4,896,095        07/119,373        11/12/87        01/23/90       03/10/99
5,243,947        07/911,292        07/09/92        09/14/93       03/10/99
5,300,040        08/085,095        07/02/93        04/05/94       03/05/99
5,305,631        07/899,432        06/16/92        04/26/94       03/10/99
5,306,429        07/968,319        10/29/92        04/26/94       03/05/99
5,308,813        08/011,915        02/01/93        05/03/94       03/09/99
5,313,439        07/914,343        07/17/92        05/17/94       03/05/99
5,316,752        07/692,002        04/26/91        05/31/94       03/10/99
5,318,491        07/963,389        10/19/92        06/07/94       03/05/99
5,320,164        07/993,741        12/10/92        06/14/94       03/09/99
5,322,517        07/730,920        10/01/91        06/21/94       03/09/99
5,324,989        07/992,941        12/17/92        06/28/94       03/09/99
5,327,968        07/998,279        12/30/92        07/12/94       03/09/99
5,339,577        07/986,357        12/08/92        08/23/94       03/09/99
5,658,172        08/598,219        02/07/96        08/19/97       03/09/99