Granted Patent
Utility
US 5,021,159 · App. 07/229,673
Apparatus for thickening pulp and paper stock
Inventors:
Terry L. Bliss, David E. Chupka, Christopher McCarthy, Larry J. Walters
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Aug 8, 1988
Inventors
Terry L. Bliss
David E. Chupka
Christopher McCarthy
Larry J. Walters
Assignee (at issue)
Black Clawson Company, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.