Patents Reinstated Due to the Acceptance of a Late Maintenance Fee From 04/07/00 Patent Serial Filing Issue Granted Number Number Date Date Date 4,411,206 06/284,813 07/20/81 10/25/83 04/13/00 4,573,327 06/652,849 09/21/84 03/04/86 04/11/00 4,616,263 06/700,424 02/11/85 10/07/86 04/10/00 4,958,310 07/122,946 11/19/87 09/18/90 04/10/00 5,053,983 06/849,071 04/04/86 10/01/91 04/13/00 5,248,391 07/942,858 09/10/92 09/28/93 04/10/00 5,392,424 07/897,183 06/11/92 02/21/95 04/13/00 5,458,179 08/298,216 08/29/94 10/17/95 04/12/00