Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/23/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,508,124        06/525,976        08/24/83        04/02/85       01/23/98
4,534,364        06/533,365        09/19/83        08/13/85       01/29/98
4,716,795        06/845,930        12/22/86        01/05/88       01/29/98
4,716,796        06/845,931        03/28/86        01/05/88       01/29/98
4,827,935        06/855,321        04/24/86        05/09/89       01/28/98
4,838,549        07/192,913        05/12/88        06/13/89       01/29/98
4,844,752        06/915,777        10/06/86        07/04/89       01/23/98
4,850,313        07/155,823        02/16/88        07/25/89       01/28/98
4,871,986        07/268,829        11/04/88        10/03/89       01/28/98
4,872,765        06/487,560        04/20/83        10/10/89       01/26/98
4,873,772        06/880,176        06/30/86        10/17/89       01/23/98
5,042,439        07/494,993        03/15/90        08/27/91       01/29/98
5,115,026        07/243,830        09/13/88        05/19/92       01/28/98
5,173,346        07/540,576        06/18/90        12/22/92       01/26/98
5,178,566        07/537,060        06/12/90        01/12/93       01/26/98
5,225,924        07/500,971        03/29/90        07/06/93       01/29/98
5,228,363        07/773,859        10/17/91        07/20/93       01/29/98
5,238,697        07/886,862        05/22/92        08/24/93       01/26/98