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

4,928,973        07/097,640        05/29/90        09/16/87            05/25/95
4,958,790        07/349,118        09/25/90        05/05/89            05/25/95
4,981,183        07/215,500        01/01/91        07/06/88            05/26/95
4,983,328        07/170,611        01/08/91        03/15/88            05/25/95
4,990,057        07/346,749        02/05/91        05/03/89            05/25/95
4,626,943        06/627,651        12/02/86        07/03/84            05/26/95
4,647,257        06/704,500        03/03/87        02/22/85            05/15/95