Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 12/10/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 36,312       08/889,305        07/08/97        09/28/99       12/14/99
4,534,244        06/421,319        09/22/82        08/13/85       12/13/99
4,587,243        06/754,836        07/15/85        05/06/86       12/10/99
4,621,955        06/600,806        04/16/84        11/11/86       12/14/99
4,625,490        06/782,531        10/01/85        12/02/86       12/15/99
4,642,678        06/825,008        02/03/86        02/10/87       12/13/99
4,673,045        06/892,266        08/04/86        06/16/87       12/13/99
4,724,309        06/861,601        05/09/86        02/09/88       12/13/99
4,868,861        07/187,442        04/28/88        09/19/89       12/13/99
4,939,352        07/430,889        11/02/89        07/03/90       12/14/99
4,986,329        07/479,834        02/14/90        01/22/91       12/14/99
5,006,737        07/341,881        04/24/89        04/09/91       12/15/99
5,012,139        07/428,671        10/30/89        04/30/91       12/15/99
5,290,175        07/815,648        12/30/91        03/01/94       12/15/99
5,300,289        07/806,070        12/10/91        04/05/94       12/13/99
5,305,839        08/004,886        01/19/93        04/26/94       12/14/99
5,318,586        08/005,437        01/19/93        06/07/94       12/14/99
5,320,829        07/805,598        12/10/91        06/14/94       12/14/99
5,322,136        07/916,285        07/17/92        06/21/94       12/13/99
5,324,055        08/040,381        03/25/93        06/28/94       12/15/99
5,326,380        07/966,698        10/26/92        07/05/94       12/14/99
5,328,985        07/729,460        07/12/91        07/12/94       12/10/99
5,387,413        07/767,114        09/27/91        02/07/95       12/15/99
5,391,301        08/133,344        10/08/93        02/21/95       12/14/99
5,393,401        07/966,148        01/07/93        02/28/95       12/14/99
5,413,561        08/060,656        05/13/93        05/09/95       12/16/99
5,423,326        08/061,360        05/14/93        06/13/95       12/14/99
5,423,666        08/243,379        05/16/94        06/13/95       12/15/99
5,426,730        08/188,749        01/31/94        06/20/95       12/14/99
5,436,525        07/985,575        12/03/92        07/25/95       12/14/99
5,440,162        08/280,417        07/26/94        08/08/95       12/14/99
5,448,187        08/152,183        11/15/93        09/05/95       12/16/99
5,451,615        08/326,430        10/20/94        09/19/95       12/14/99
5,452,588        08/213,015        03/15/94        09/26/95       12/15/99
5,455,874        08/124,571        09/20/93        10/03/95       12/15/99
5,457,123        08/252,243        06/01/94        10/10/95       12/13/99