Granted Patent
Utility
US 4,722,793 · App. 07/029,301
Apparatus and method for thickening pulp and paper stock
Inventors:
Peter Seifert, Michael F. Kinne, Larry D. Markham
Patented Case
View Patent ↗
Granted: Feb 2, 1988
Filed: Mar 23, 1987
Inventors
Peter Seifert
Michael F. Kinne
Larry D. Markham
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.