Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 01/02/98

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,529,470        06/419,533        09/17/82        07/16/85       01/08/98
4,830,409        07/085,175        08/14/87        05/16/89       01/06/98
4,834,270        07/179,854        04/11/88        05/30/89       01/05/98
4,835,978        07/189,757        05/03/88        06/06/89       01/05/98
4,858,478        07/232,659        08/16/88        08/22/89       01/05/98
5,104,661        07/648,315        01/29/91        04/14/92       01/08/98
5,134,080        07/536,165        06/11/90        07/28/92       01/05/98
5,212,772        07/653,777        02/11/91        05/18/93       01/07/98
5,232,746        07/628,580        12/17/90        08/03/93       01/05/98
5,250,139        07/846,961        03/06/92        10/05/93       01/05/98