NOTIFICATION OF ACCEPTANCE OF DELAYED PAYMENT OF MAINTENANCE FEE (35 U.S.C. 41(c); 37 CFR 1.378) The patent(s) listed below are considered as not having expired but are subject to the conditions set forth in 35 U.S.C. 41(c)(2), in view of the Petition to Accept Late Payment of the maintenance fees which has been GRANTED BY THE COMMISSIONER OF PATENTS AND TRADEMARKS, as provided for under 35 U.S.C. 41(c)(1) and 37 CFR 1.378. Application Delayed Payment Patent No. Serial No. Patent Date Filing Date Acceptance Date 4,640,589 06/836,713 02/03/87 03/03/86 05/03/95 4,813,979 07/151,383 03/21/89 02/02/88 03/29/95 4,865,324 07/152,410 09/12/89 02/04/88 03/15/95 4,928,603 07/203,006 05/29/90 06/06/88 04/24/95