Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 11/26/99

Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

Re. 35,174       08/087,170        07/02/93        03/12/96        12/01/99
Re. 35,594       08/561,270        11/21/95        08/26/97        12/01/99
4,547,125        06/561,949        12/15/83        10/15/85        11/26/99
4,603,990        06/512,538        07/11/83        08/05/86        11/26/99
4,815,168        07/117,747        11/04/87        03/28/89        12/01/99
4,960,171        07/391,807        08/09/89        10/02/90        11/26/99
4,968,439        07/257,062        10/13/88        11/06/90        11/29/99
5,285,272        07/661,521        02/26/91        02/08/94        12/02/99
5,304,531        06/705,406        12/19/84        04/19/94        12/01/99
5,319,491        07/565,481        08/10/90        06/07/94        11/29/99
5,324,163        07/981,868        11/25/92        06/28/94        12/01/99
5,345,281        07/992,182        12/17/92        09/06/94        12/01/99
5,348,307        08/134,639        10/12/93        09/20/94        11/30/99
5,352,634        07/855,523        03/23/92        10/04/94        12/02/99
5,391,198        08/197,244        02/16/94        02/21/95        11/30/99
5,398,922        08/144,222        10/27/93        03/21/95        12/02/99
5,422,583        08/207,856        03/08/94        06/06/95        11/29/99
5,429,827        08/226,658        04/12/94        07/04/95        12/01/99
5,445,526        08/197,670        02/17/94        08/29/95        12/02/99
5,448,791        08/059,096        05/10/93        09/12/95        11/30/99
5,448,918        08/298,910        08/31/94        09/12/95        12/01/99