Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 03/12/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,613,325        06/564,332        12/22/83        09/23/86       03/17/99
4,813,855        07/066,759        06/26/87        03/21/89       03/12/99
4,939,096        06/905,856        09/10/86        07/03/90       03/16/99
4,939,600        07/293,818        01/05/89        07/03/90       03/15/99
4,958,770        07/346,637        05/03/89        09/25/90       03/12/99
5,249,179        07/527,975        05/24/90        09/28/93       03/12/99
5,300,141        07/881,418        05/11/92        04/05/94       03/12/99
5,305,008        07/941,322        09/04/92        04/19/94       03/16/99
5,312,093        07/826,712        01/28/92        05/17/94       03/15/99
5,313,763        07/902,911        06/24/92        05/24/94       03/16/99
5,327,897        08/047,583        04/13/93        07/12/94       03/16/99
5,336,433        07/891,735        06/08/92        08/09/94       03/12/99
5,338,610        08/017,143        02/12/93        08/16/94       03/16/99