Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 03/10/00

Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

4,599,510        06/568,384        01/05/84        07/08/86        03/14/00
4,652,924        06/679,696        12/10/84        03/24/87        03/13/00
4,688,364        06/931,923        11/14/86        08/25/87        03/13/00
4,823,634        07/116,105        11/03/87        04/25/89        03/14/00
4,876,805        07/188,907        04/29/88        10/31/89        03/14/00
4,903,407        07/184,296        04/21/88        02/27/90        03/13/00
4,924,913        07/150,959        02/01/88        05/15/90        03/13/00
5,012,411        06/757,965        07/23/85        04/30/91        03/13/00
5,015,266        07/255,113        10/07/88        05/14/91        03/16/00
5,045,066        07/535,003        06/07/90        09/03/91        03/16/00
5,060,644        07/577,806        09/04/90        10/29/91        03/16/00
5,067,432        07/527,362        05/23/90        11/26/91        03/16/00
5,235,868        07/770,795        10/02/91        08/17/93        03/14/00
5,288,342        07/816,636        12/31/91        02/22/94        03/15/00
5,292,124        08/018,148        02/16/93        03/08/94        03/16/00
5,325,261        07/843,764        03/02/92        06/28/94        03/16/00
5,370,523        08/106,702        08/16/93        12/06/94        03/16/00
5,450,241        08/271,499        07/07/94        09/12/95        03/10/00
5,485,062        08/203,261        02/28/94        10/17/95        03/16/00
5,464,143        08/245,882        05/18/94        11/07/95        03/16/00
5,472,084        08/277,397        07/19/94        12/05/95        03/16/00
5,473,706        08/213,389        03/14/94        12/05/95        03/16/00
5,478,232        08/216,103        03/22/94        12/26/95        03/16/00