Patents Reinstated Due to the Acceptance of a Late Maintenance Fee From 12/19/97 Patent Serial Filing Issue Granted Number Number Date Date Date 4,430,524 06/360,198 03/22/82 02/07/84 12/22/97 4,493,623 06/468,066 02/22/83 01/15/85 12/22/97 4,842,530 07/149,572 01/28/88 06/27/89 12/22/97 5,130,893 07/630,647 12/20/90 07/14/92 12/23/97 5,196,238 07/660,370 02/25/91 03/23/93 12/22/97