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

Re. 34,270       07/783,831        06/01/93        10/29/91       01/18/95
(4,899,237)     (07/366,366)      (02/06/90)      (06/15/89)
4,345,199        06/241,454        08/17/82        03/06/81        01/17/95
4,392,911        06/377,336        07/12/83        05/12/82        01/09/95
4,499,885        06/527,874        02/19/85        08/30/83        01/17/95
4,594,229        06/238,234        06/10/86        02/25/81        01/13/95
4,766,433        06/628,234        08/23/88        07/06/84        09/16/94
4,795,494        07/167,845        01/03/89        03/14/88        01/18/95
4,798,959        07/001,330        01/17/89        01/02/87        01/13/95
4,841,946        06/923,390        06/27/89        10/27/86        01/09/95
4,869,699        07/302,377        09/26/89        01/27/89        01/11/95
4,892,060        07/185,955        01/09/90        04/25/88        01/18/95
4,918,750        07/182,732        04/17/90        04/18/88        09/16/94
4,919,212        07/335,647        04/24/90        04/10/89        01/11/95
4,925,575        07/294,353        05/15/90        01/09/89        01/18/95
4,936,953        07/356,641        06/26/90        05/22/89        12/30/94
4,939,661        07/243,317        07/03/90        09/09/88        01/11/95
4,942,081        07/146,339        07/17/90        01/21/88        01/18/95
4,945,401        07/247,719        07/31/90        09/22/88        01/11/95
4,947,066        07/265,728        08/07/90        11/01/88        01/13/95
4,947,291        07/208,218        08/07/90        06/17/88        01/19/95
4,956,635        07/339,129        09/11/90        04/14/89        11/28/94