Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 11/19/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,865,894        07/107,686        10/13/87        09/12/89       11/22/99
4,927,503        07/308,596        02/10/89        05/22/90       11/24/99
4,968,540        07/280,432        12/06/88        11/06/90       11/23/99
5,252,787        07/697,784        05/09/91        10/12/93       11/22/99
5,289,783        07/951,778        09/28/92        03/01/94       11/22/99
5,297,946        07/971,683        11/04/92        03/29/94       11/22/99
5,368,304        08/054,406        04/28/93        11/29/94       11/23/99
5,375,647        08/101,462        08/02/93        12/27/94       11/22/99
5,379,270        08/217,816        03/25/94        01/03/95       11/22/99
5,422,167        08/123,323        09/17/93        06/06/95       11/22/99
5,441,362        08/128,426        09/30/93        08/15/95       11/22/99