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

4,351,507        06/225,692        09/28/82        01/16/81        03/06/95
4,464,761        06/332,258        08/07/84        12/18/81        09/02/94
4,493,641        06/569,500        01/15/85        01/09/84        03/03/95
4,580,292        06/631,100        04/01/86        07/16/84        02/27/95
4,580,897        06/615,644        04/08/86        05/31/84        06/13/94
4,618,810        06/464,114        10/21/86        02/04/83        03/06/95
4,620,744        06/677,384        11/04/86        12/03/84        03/06/95
4,749,324        07/031,907        06/07/88        03/30/87        02/28/95
4,750,550        06/882,885        06/14/88        06/24/86        08/31/94
4,834,648        07/097,742        05/30/89        09/17/87        11/28/94
4,838,911        07/237,695        06/13/89        08/26/88        02/28/95
4,843,122        07/043,568        06/27/89        06/28/87        02/15/95
4,863,849        06/756,129        09/05/89        07/18/85        01/18/95
4,868,103        06/831,250        09/19/89        02/19/86        03/09/95
4,872,084        07/240,740        10/03/89        09/06/88        11/28/94
4,920,537        07/215,394        04/24/90        07/05/88        03/09/95
4,922,822        07/283,501        05/08/90        12/12/88        02/28/95
4,923,165        07/399,328        05/08/90        08/28/89        03/06/95
4,945,902        07/284,668        08/07/90        12/15/88        01/17/95
4,952,685        07/043,668        08/28/90        04/28/87        03/06/95
4,962,285        07/267,487        10/09/90        11/04/88        03/06/95
4,969,893        07/367,423        11/13/90        06/16/89        01/20/95
4,972,807        07/357,473        11/27/90        05/26/89        03/09/95