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

4,362,589        06/325,132        12/07/82        11/27/81        04/20/95
4,573,217        06/635,810        03/04/86        07/30/84        04/18/95
4,813,344        07/039,977        03/21/89        04/20/87        03/29/95
4,815,488        07/070,250        03/28/89        07/06/87        04/20/95
4,819,569        07/158,204        04/11/89        02/19/88        04/24/95
4,831,257        06/912,883        05/16/89        09/26/86        03/20/95
4,858,054        07/195,591        08/15/89        05/18/88        04/20/95
4,931,704        07/281,679        06/05/90        12/09/88        04/20/95
4,938,411        07/331,142        07/03/90        03/31/89        04/20/95
4,963,849        07/344,936        10/16/90        04/28/89        03/30/95
4,964,857        07/425,130        10/23/90        10/23/89        04/20/95
4,989,064        07/376,144        01/29/91        07/05/89        04/20/95