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

4,502,091        06/581,732        02/26/85        02/21/84        03/06/95
4,594,154        06/636,896        06/10/86        08/02/84        03/29/95
4,609,875        06/526,613        09/02/86        08/26/83        03/30/95
4,802,574        07/127,165        02/07/89        12/01/87        02/28/95
4,817,137        07/126,877        03/28/89        11/30/87        03/29/95
4,813,979        07/151,383        03/21/89        02/02/88        03/29/95
4,843,665        07/179,575        07/04/89        04/08/88        03/29/95
4,864,499        06/938,538        09/05/89        12/05/86        03/31/95
4,925,165        07/264,828        05/15/90        10/31/88        03/31/95
4,963,280        07/149,737        10/16/90        01/29/88        03/30/95