Patents Reinstated Due to the Acceptance of a
                       Late Maintenance Fee From 3/14/97

Patent           Serial            Filing          Issue           Granted
Number           Number            Date            Date            Date

4,371,306        06/237,441        02/23/81        02/01/83        03/17/97
4,419,894        06/289,434        08/03/81        12/13/83        03/18/97
4,428,943        06/283,376        07/15/81        01/31/84        03/20/97
4,469,736        06/496,663        05/20/83        09/04/84        03/14/97
4,475,551        06/414,353        09/02/82        10/09/84        03/20/97
4,612,735        06/659,146        10/09/84        09/23/86        03/14/97
4,637,736        06/725,127        04/19/85        01/20/87        03/17/97
4,727,064        06/738,749        05/29/85        02/23/88        03/17/97
4,727,863        06/868,937        05/30/86        03/01/88        03/17/97
4,729,914        07/056,338        05/22/87        03/08/88        03/17/97
4,777,762        06/946,062        12/24/86        10/18/88        03/14/97
4,779,411        06/946,751        12/29/86        10/25/88        03/21/97
4,783,818        06/788,411        10/17/85        11/08/88        03/17/97
4,785,488        07/128,683        12/04/87        11/22/88        03/14/97
4,942,865        07/208,962        06/20/88        07/24/90        03/18/97
4,972,953        07/366,172        06/14/89        11/27/90        03/14/97
4,976,053        07/404,268        09/07/89        12/11/90        03/20/97
5,013,578        07/448,379        12/11/89        05/07/91        03/20/97
5,088,123        07/698,265        05/10/91        02/18/92        03/20/97
5,103,658        07/646,821        01/28/91        04/14/92        03/19/97
5,116,508        07/483,870        02/23/90        05/26/92        03/20/97
5,122,165        07/715,992        06/11/91        06/16/92        03/19/97
5,134,979        07/580,630        09/10/90        08/04/92        03/17/97
5,145,095        07/397,393        08/23/89        09/08/92        03/14/97
5,150,171        07/559,039        07/30/90        09/22/92        03/17/97
5,152,608        07/793,139        11/18/91        10/06/92        03/17/97
5,155,924        07/636,758        01/02/91        10/20/92        03/20/97
5,160,133        07/568,971        08/17/90        11/03/92        03/17/97
5,161,799        07/837,950        02/20/92        11/10/92        03/18/97