Patents Reinstated Due To The Acceptance of a Late Maintenance Fee From 4/12/96 Patent Number Serial Number Filing Date Issue Date Granted Date 4,420,864 06/237,618 02/24/81 12/20/83 04/17/96 4,600,706 06/552,771 11/17/83 07/15/86 04/15/96 4,634,384 06/576,432 02/02/84 01/06/87 04/17/96 5,038,780 07/188,337 04/29/88 08/13/91 04/17/96 5,077,932 07/544,411 06/27/90 01/07/92 04/17/96 5,080,426 07/503,431 03/30/90 01/14/92 04/18/96