Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 05/11/01

Patent          Serial          Filing          Issue           Granted
Number          Number          Date            Date            Date

4,788,658       06/881,974      07/03/86        11/29/88        05/15/01
4,813,940       07/121,143      11/16/87        03/21/89        05/14/01
5,141,329       07/589,376      09/27/90        08/25/92        05/14/01
5,157,789       07/790,227      11/08/91        10/27/92        05/15/01
5,162,873       07/751,028      08/28/91        11/10/92        05/14/01
5,187,945       07/699,002      05/13/91        02/23/93        05/11/01
5,229,182       07/815,955      01/02/92        07/20/93        05/14/01
5,406,865       08/137,564      10/18/93        04/18/95        05/15/01
5,424,506       07/860,822      05/05/92        06/13/95        05/14/01
5,426,809       08/116,272      09/03/93        06/27/95        05/11/01
5,441,761       08/338,277      11/14/94        08/15/95        05/11/01
5,455,033       08/065,342      05/21/93        10/03/95        05/11/01
5,544,597       08/521,129      08/29/95        08/13/96        05/17/01
5,561,883       08/306,706      09/15/94        10/08/96        05/11/01
5,579,599       08/351,805      12/08/94        12/03/96        05/15/01
5,581,693       08/566,278      12/01/95        12/03/96        05/15/01
5,586,324       08/163,246      12/06/93        12/17/96        05/15/01
5,590,287       08/207,810      03/07/94        12/31/96        05/15/01
5,592,071       08/371,322      01/11/95        01/07/97        05/15/01
5,592,616       08/481,634      06/07/95        01/07/97        05/16/01
5,592,684       08/279,758      07/22/94        01/07/97        05/14/01
5,592,877       08/548,072      10/25/95        01/14/97        05/16/01
5,593,322       08/375,328      01/17/95        01/14/97        05/15/01
5,598,577       08/569,309      12/08/97        01/28/97        05/15/01
5,604,767       08/506,207      07/24/95        02/18/97        05/15/01