Patent Reinstated Due to the Acceptance of a
                      Late Maintenance Fee From 04/16/99

Patent           Serial            Filing          Issue          Granted
Number           Number            Date            Date           Date

4,581,287        06/764,091        08/09/85        04/08/86       04/19/99
4,812,195        06/940,890        12/12/86        03/14/89       04/16/99
5,142,820        07/626,749        12/13/90        09/01/92       04/22/99
5,153,781        07/436,981        10/19/89        10/06/92       04/16/99
5,159,758        07/767,325        09/30/91        11/03/92       04/20/99
5,281,732        07/815,700        12/31/91        01/25/94       04/22/99
5,298,129        07/976,118        11/13/92        03/29/94       04/19/99
5,298,130        07/976,117        11/13/92        03/29/94       04/19/99
5,305,190        07/717,362        06/19/91        04/19/94       04/19/99
5,306,388        07/828,503        01/31/92        04/26/94       04/16/99
5,328,212        08/055,677        04/30/93        07/12/94       04/16/99
5,356,879        07/835,496        02/14/92        10/18/94       04/21/99