Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 05/01/98
   
Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,502,616        06/337,080        01/04/82        03/05/85       05/06/98
4,564,953        06/479,373        03/28/83        01/14/86       05/06/98
4,732,881        06/911,381        09/25/86        03/22/88       05/07/98
4,902,119        07/239,196        08/31/88        02/20/90       05/06/98
4,964,401        07/414,467        09/29/89        10/23/90       05/07/98
5,095,917        07/467,882        01/19/90        03/17/92       05/07/98
5,196,595        07/877,280        04/28/92        03/23/93       05/06/98