Patents Reinstated Due to the Acceptance of a Late Maintenance Fee From 07/17/98 Patent Serial Filing Issue Granted Number Number Date Date Date 4,804,449 07/090,404 08/27/87 02/14/89 07/20/98 4,888,797 07/109,501 10/16/87 12/19/89 07/20/98 5,116,604 07/765,811 09/26/91 05/26/92 07/20/98 5,221,471 07/723,007 06/27/91 06/22/93 07/20/98