Patents Reinstated Due to the Acceptance of a Late Maintenance Fee From 03/27/98 Patent Serial Filing Date Issue Granted Number Number Date Date Date 4,545,931 06/455,265 01/03/83 10/08/85 03/31/98 4,861,270 07/238,453 08/30/88 08/29/89 03/27/98 4,889,524 07/093,366 09/04/87 12/26/89 03/31/98 4,891,821 07/329,396 03/27/89 01/02/90 03/30/98 4,993,675 07/438,613 11/17/89 02/19/91 03/27/98 5,077,995 07/670,571 03/18/91 01/07/92 03/31/98 5,087,533 07/638,222 01/07/91 02/11/92 03/30/98 5,097,250 07/646,092 01/25/91 03/17/92 03/31/98 5,133,352 07/508,840 04/12/90 07/28/92 03/30/98 5,139,756 07/825,764 01/21/92 08/18/92 03/31/98 5,178,750 07/718,140 06/20/91 01/12/93 03/31/98 5,229,364 07/670,296 03/15/91 07/20/93 03/31/98 5,268,545 07/993,192 12/18/92 12/07/93 04/01/98