Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 04/09/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,557,118        06/678,917        12/06/84        12/10/85       04/09/99
4,784,986        06/925,061        10/30/86        11/15/88       04/14/99
4,810,513        06/925,650        10/30/86        03/07/89       04/09/99
4,832,013        07/148,910        01/27/88        05/23/89       04/14/99
4,913,394        07/252,156        10/03/88        04/03/90       04/09/99
4,926,605        07/191,419        05/09/88        05/22/90       04/14/99
5,158,155        07/595,553        10/11/90        10/27/92       04/14/99
5,159,580        07/770,545        10/03/91        10/27/92       04/14/99
5,197,040        07/860,882        03/31/92        03/23/93       04/14/99
5,212,722        07/905,229        06/29/92        05/18/93       04/12/99
5,222,121        07/540,436        06/19/90        06/22/93       04/09/99
5,245,573        07/702,536        05/20/91        09/14/93       04/14/99
5,250,075        07/939,949        09/02/92        10/05/93       04/15/99
5,258,222        07/631,893        12/21/90        11/02/93       04/09/99
5,261,012        07/881,108        05/11/92        11/09/93       04/09/99
5,296,183        07/933,371        08/21/92        03/22/94       04/12/99
5,308,541        07/623,380        11/15/90        05/03/94       04/09/99
5,313,921        07/995,785        12/23/92        05/24/94       04/15/99
5,318,960        07/893,011        06/03/92        06/07/94       04/14/99
5,320,590        07/991,281        12/15/92        06/14/94       04/12/99
5,322,083        08/120,077        09/13/93        06/21/94       04/12/99
5,325,881        07/985,893        12/04/92        07/05/94       04/14/99
5,328,170        07/849,223        03/10/92        07/12/94       04/09/99
5,339,625        07/986,087        12/04/92        08/23/94       04/12/99
5,346,476        07/875,756        04/29/92        09/13/94       04/09/99
5,347,950        07/887,726        05/22/92        09/20/94       04/09/99