Errata

  In the list of patents which expired on May 20, 1993, due to failure to
pay maintenance fees, in the O.G. of August 02, 1994, the following patent
should not have appeared:

Patent Number          Serial Number            Issue Date          Filing Date

Re. 33,293             07/195,854               08/07/90            05/19/88
                       06/777,028               05/20/86            09/17/85


                                    Errata

  In the list of patents which expired on July 18, 1992, due to failure to
pay maintenance fees, in the O.G. of October 5, 1993, the following patent
should not have appeared:

Patent Number         Serial Number             Issue Date          Filing Date

4,849,770             06/936,785                07/18/89            12/02/86


                                    Errata

  In the list of patents which expired on August 29, 1993, due to failure
to pay maintenance fees, in the O.G. of November 16, 1993, the following
patent should not have appeared:

Patent Number         Serial Number             Issue Date          Filing Date

4,537,096             06/584,145                08/27/85            02/27/84


                                    Errata

  In the list of patents which expired on September 25, 1994, due to
failure to pay maintenance fees, in the O.G. of December 06, 1994, the
following patent should not have appeared:

Patent Number         Serial Number             Issue Date          Filing Date

4,958,988             07/063,755                09/25/90            06/17/87


                                    Errata

  In the list of patents which expired on December 26, 1993, due to
failure to pay maintenance fees, in the O.G. of March 15, 1994, the
following patent should not have appeared:

Patent Number         Serial Number              Issue Date         Filing Date

Re. 34,561            07/816,028                 03/15/94           12/30/91
(4,890,573)           (07/223,630)               (01/02/90)        (07/25/88)