Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/22/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,681,471        06/636,080        07/31/84        07/21/87       01/25/99
4,772,307        07/089,007        08/20/87        09/20/88       01/22/99
4,817,810        07/145,293        01/19/88        04/04/89       01/25/99
4,869,078        07/238,412        08/31/88        09/26/89       01/26/99
4,960,381        07/231,653        08/10/88        10/02/90       01/25/99
4,997,325        07/343,529        04/26/89        03/05/91       1/25/99
5,329,087        08/072,091        06/07/93        07/12/94       01/25/99
5,329,718        08/000,682        01/05/93        07/19/94       01/25/99