Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 12/05/97

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,428,490        06/426,865        09/29/82        01/31/84       12/08/97
4,511,875        06/476,229        03/17/83        04/16/85       12/05/97
4,633,515        06/598,210        04/09/84        12/30/86       12/09/97
4,690,213        06/825,338        02/03/86        09/01/87       12/11/97
4,787,875        07/034,382        04/06/87        11/29/88       12/11/97
4,793,617        07/080,939        08/03/87        12/27/88       12/08/97
4,816,830        07/095,683        09/14/87        03/28/89       12/10/97
4,817,966        07/151,945        02/03/88        04/04/89       12/05/97
4,823,763        07/072,999        07/13/87        04/25/89       12/08/97
4,829,285        07/061,879        06/11/87        05/09/89       12/08/97
4,846,194        06/661,161        10/15/84        07/11/89       12/09/97
4,853,854        06/813,401        12/26/85        08/01/89       12/05/97
4,858,383        07/217,334        07/11/88        08/22/89       12/11/97
4,950,664        07/245,031        09/16/88        08/21/90       12/10/97
5,051,137        07/205,842        06/13/88        09/24/91       12/11/97
5,129,966        07/625,844        12/11/90        07/14/92       12/11/97
5,147,341        07/664,873        03/05/91        09/15/92       12/08/97
5,193,231        07/516,147        04/30/90        03/16/93       12/09/97
5,203,938        07/791,043        11/12/91        04/20/93       12/08/97
5,224,474        07/711,538        06/10/91        07/06/93       12/11/97
5,231,499        07/654,127        02/11/91        07/27/93       12/05/97
5,233,215        07/895,592        06/08/92        08/03/93       12/05/97
5,233,951        07/951,017        09/25/92        08/10/93       12/05/97
5,238,751        07/660,020        02/25/91        08/24/93       12/05/97