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

4,475,740        06/258,149        10/09/84        04/27/81        11/10/94
4,510,772        06/476,051        04/16/85        03/17/83        10/11/94
4,599,136        06/657,277        07/08/86        10/03/84        11/17/94
4,600,837        06/557,491        07/15/86        12/01/83        11/17/94
4,601,913        06/814,581        07/22/86        12/27/85        11/17/94
4,602,828        06/736,488        07/29/86        05/20/85        11/14/94
4,799,264        07/101,395        01/17/89        09/28/87        11/21/94
4,831,393        07/131,828        05/16/89        12/11/87        11/17/94
4,935,906        07/141,693        06/19/90        01/04/88        11/17/94
4,939,022        07/328,991        07/03/90        03/27/89        11/21/94
4,945,509        07/168,031        07/31/90        03/14/88        11/17/94