Requests for Reexamination Filed

   Notice under 37 CFR 1.11(c). The requests for reexamination listed below
are open to inspection by the general public in the indicated Examining
Groups. Copies of the requests and related papers may be obtained by paying
the fee therefor established in the Rules (37 CFR 1.19(a)).
   In the event correspondence to the patent owner is not received, this
notice will be considered to be constructive notice to the patent owner
and reexamination will proceed (37 CFR 1.248(a)(5) and 1.525(b)).

   4,673,507, Reexam. S.N. 90/005,899, Dec. 22, 2000, Cl. 210/681, FLUID
TREATMENT PROCESS AND APPARATUS, Craig J. Brown, Owner of Record: Eco-Tec
Limited, Pickering, Ontario, Canada, Attorney or Agent: Bereskin and Parr,
Toronto, Ontario, Canada, Ex. Gp.: 1724, Requester: David J. Serbin, Law
Office of David J. Serbin, Alexandria, VA

   5,107,888, Reexam. S.N. 90/005,902, Jan. 3, 2001, Cl. 137/527, N-SHAPED
BACKFLOW PREVENTOR, Charles W. Dunmire, Owner of Record: CMB Industries,
Inc., Fresno, CA, Attorney or Agent: Sheridan Ross, Denver, CO, Ex. Gp.:
3753, Requester: Zurn Industries, Inc., Erie, PA; c/o Paul M. Reznick,
Webb, Ziesenheim, Logsdon, Orkin and Hanson, Pittsburgh, PA

   5,275,595, Reexam. S.N. 90/005,900, Jan. 3, 2001, Cl. 606/023,
CRYOSURGICAL INSTRUMENT, John D. Dobak, III, Owner of Record: Cryogen,
Inc., San Diego, CA, Attorney or Agent: John C. Altmiller, Kenyon and
Kenyon, Washington, DC, Ex. Gp.: 3739, Requester: Ethicon, Inc.,
Somerville, NJ; c/o Robert J. Frank, Venable,   Washington, DC

   5,392,803,  Reexam. S.N. 90/005,903, Jan. 3, 2001, Cl. 137/015,
APPARATUS AND METHOD FOR INSTALLING VALVES, Douglas A. Bruce, Owner of
Record: CMB Industries, Inc., Fresno, CA, Attorney or Agent: Sheridan
Ross, Denver, CO, Ex. Gp.: 3753, Requester: Zurn Industries, Inc., Erie,
PA; c/o Paul M. Reznick, Webb, Ziesenheim, Logsdon, Orkin and Hanson,
Pittsburgh, PA

5,758,505, Reexam. S.N. 90/005,901, Jan. 3, 2001, Cl. 062/006, PRECOOLING
SYSTEM FOR JOULE-THOMSON PROBE, John D. Dobak, III, et. al., Owner of
Record: Cryogen, Inc., San Diego, CA, Attorney or Agent: John C. Altmiller,
Kenyon and Kenyon, Washington, DC, Ex. Gp.: 3744, Requester: Ethicon, Inc.,
Somerville, NJ; c/o Robert J. Frank, Venable, Washington, DC