Patents Reinstated Due to the Acceptance of a Late Maintenance Fee From 04/03/98 Patent Serial Filing Issue Granted Number Number Date Date Date 4,773,400 07/112,467 10/26/87 09/27/88 04/09/98 4,880,765 07/272,694 11/03/88 11/14/89 04/06/98 5,155,924 07/636,758 01/02/91 10/20/92 04/09/98 5,218,473 07/550,255 07/06/90 06/08/93 04/09/98 5,261,301 07/950,392 09/24/92 11/16/93 04/06/98 5,305,579 07/990,121 12/14/92 04/26/94 04/09/98