Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 09/17/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

Re. 34,989       07/742,852        08/08/91        07/04/95       09/23/99
4,493,378        06/284,129        07/16/81        01/15/85       09/22/99
4,537,357        06/658,209        10/05/84        08/27/85       09/20/99
4,559,588        06/567,902        01/03/84        12/17/85       09/23/99
4,594,913        06/581,319        02/17/84        06/17/86       09/22/99
4,627,136        06/374,604        04/30/82        12/09/86       09/22/99
4,667,773        06/879,817        06/27/86        05/26/87       08/22/99
4,803,542        07/051,850        05/18/87        02/07/89       09/22/99
4,913,153        07/120,076        11/13/87        04/03/90       09/22/99
4,921,685        07/283,401        12/12/88        05/01/90       09/21/99
4,940,410        07/235,649        08/24/88        07/10/90       09/17/99
4,951,203        07/200,234        05/31/88        08/21/90       09/22/99
4,954,012        07/335,559        04/10/89        09/04/90       09/22/99
4,989,697        07/321,178        03/09/89        02/05/91       09/23/99
5,038,556        07/481,341        02/16/90        08/13/91       09/22/99
5,056,450        07/455,632        12/22/89        10/15/91       09/17/99
5,199,773        07/630,521        12/20/90        04/06/93       09/20/99
5,234,848        07/787,850        11/05/91        08/10/93       09/22/99
5,283,420        07/660,690        05/06/91        02/01/94       09/22/99
5,306,375        08/077,710        06/15/93        04/26/94       09/20/99
5,312,614        07/538,255        06/14/90        05/17/94       09/22/99
5,315,325        07/747,552        08/20/91        05/24/94       09/20/99
5,325,342        07/865,302        04/08/92        06/28/94       09/22/99
5,332,271        07/769,778        10/02/91        07/26/94       09/22/99
5,334,904        07/820,763        01/15/92        08/02/94       09/21/99
5,353,945        07/949,572        09/22/92        10/11/94       09/21/99
5,375,852        08/096,065        07/22/93        12/27/94       09/23/99
5,431,404        08/281,175        07/27/94        07/11/95       09/17/99