Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 5/25/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,648,468       06/749,154      06/26/85        03/10/87        05/30/01
5,064,701       07/419,210      10/10/89        11/12/91        05/30/01
5,085,110       07/520,766      05/08/90        02/04/92        05/25/01
5,103,354       07/641,623      01/16/91        04/07/92        05/25/01
5,137,764       07/623,177      12/06/90        08/11/92        05/30/01
5,176,305       07/645,830      01/25/91        01/05/93        05/25/01
5,195,203       07/760,624      09/16/91        03/23/93        05/30/01
5,228,259       07/875,900      04/29/92        07/20/93        05/29/01
5,232,141       07/841,878      02/26/92        08/03/93        05/25/01
5,419,275       07/984,898      12/02/92        05/30/95        05/31/01
5,460,679       08/190,916      02/03/94        10/24/95        05/30/01
5,528,471       08/269,106      06/30/94        06/18/96        05/30/01
5,589,984       08/341,665      11/17/94        12/31/96        05/30/01
5,592,378       08/293,470      08/19/94        01/07/97        05/30/01
5,607,674       08/428,175      07/10/95        03/04/97        05/29/01