Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 6/13/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,596,371        06/615,727        05/31/84        06/24/86       06/18/97
4,724,026        06/918,365        10/14/86        02/09/88       06/16/97
4,757,812        07/011,357        01/15/87        07/19/88       06/18/97
4,783,967        07/062,218        06/12/87        11/15/88       06/18/97
4,798,590        06/554,617        11/22/83        01/17/89       06/19/97
5,072,841        07/577,799        09/05/90        12/17/91       06/17/97
5,137,716        07/614,160        11/15/90        08/11/92       06/18/97
5,145,095        07/397,393        08/23/89        09/08/92       06/13/97