Patents Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 11/21/97

Patent Number    Serial Number  Filing Date      Issue Date   Granted Date

4,714,615        06/850,569        04/11/86        12/22/87       11/21/97
4,744,069        06/829,066        02/13/86        05/10/88       11/25/97
4,793,133        06/546,567        10/28/83        12/27/88       11/24/97
4,841,999        07/087,916        08/21/87        06/27/89       11/21/97
4,845,927        07/143,538        01/13/88        07/11/89       11/25/97
5,046,763        07/473,571        02/01/90        09/10/91       11/24/97
5,048,303        07/553,046        07/16/90        09/17/91       11/25/97
5,050,889        07/576,064        08/31/90        09/24/91       11/24/97
5,143,107        07/621,036        11/30/90        09/01/92       11/25/97
5,180,071        07/645,269        01/18/91        01/19/93       11/21/97
5,214,409        07/801,749        12/03/91        05/25/93       11/24/97
5,218,526        07/617,183        11/23/90        06/08/93       11/25/97
5,238,697        07/886,862        05/22/92        08/24/93       11/25/97