Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 12/17/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,652,917        06/639,610        08/10/84        03/24/87       12/21/99
4,976,063        07/364,208        06/09/89        12/11/90       12/21/99
5,027,960        07/364,117        06/12/89        07/02/91       12/23/99
5,044,596        07/550,145        07/06/90        09/03/91       12/20/99
5,048,327        07/524,581        05/17/90        09/17/91       12/21/99
5,295,947        07/875,324        04/29/92        03/22/94       12/21/99
5,325,614        08/040,640        03/31/93        07/05/94       12/22/99
5,336,144        07/972,009        11/05/92        08/09/94       12/21/99
5,367,503        08/201,124        02/24/94        11/22/94       12/17/99
5,378,401        07/828,749        01/31/92        01/03/95       12/21/99
5,386,229        08/004,681        01/14/93        01/31/95       12/20/99
5,402,828        08/056,484        05/04/93        04/04/95       12/22/99
5,407,160        08/073,721        06/09/93        04/18/95       12/21/99
5,416,007        08/273,870        07/12/94        05/16/95       12/21/99
5,422,272        08/092,243        07/14/93        06/06/95       12/23/99
5,432,330        08/242,872        05/16/94        07/11/95       12/21/99
5,445,468        08/142,962        10/29/93        08/29/95       12/23/99