Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 12/24/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,586,711        06/493,170        05/10/83        05/06/86       12/30/99
4,596,263        06/557,839        12/05/83        06/24/86       12/30/99
4,923,272        07/252,088        10/03/88        05/08/90       12/30/99
4,947,225        07/073,591        07/15/87        08/07/90       12/30/99
4,953,900        07/520,021        05/07/90        09/04/90       12/28/99
4,968,478        07/480,100        02/14/90        11/06/90       12/28/99
4,992,788        07/416,119        10/02/89        02/12/91       12/28/99
4,998,916        07/461,049        01/04/90        03/12/91       12/28/99
5,031,183        07/488,935        03/05/90        07/09/91       12/28/99
5,032,117        07/303,454        01/30/89        07/16/91       12/29/99
5,052,861        07/509,481        04/16/90        10/01/91       12/30/99
5,352,053        08/087,257        07/08/93        10/04/94       12/30/99
5,380,991        08/152,129        11/16/93        01/10/95       12/30/99
5,389,375        08/065,117        05/21/93        02/14/95       12/28/99
5,405,400        08/132,296        10/05/93        04/11/95       12/28/99
5,405,401        08/132,300        10/05/93        04/11/95       12/30/99
5,431,199        08/159,423        11/30/93        07/11/95       12/30/99
5,442,022        08/172,137        12/21/93        08/15/95       12/30/99
5,450,351        08/154,765        11/19/93        09/12/95       12/30/99
5,454,677        08/271,863        07/07/94        10/03/95       12/30/99
5,464,393        08/264,628        06/23/94        11/07/95       12/28/99