IP Library Granted Patent US 3,947,314
Granted Patent Utility
US 3,947,314 · App. 05/465,095

Method of treating paper fibers in a stationary screen

Inventors: David E. Chupka, Donald Lehman, Gilbert E. Kohr
Patented Case View Patent ↗
Granted: Mar 30, 1976 Filed: Apr 29, 1974
Inventors
David E. Chupka
Donald Lehman
Gilbert E. Kohr
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.

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Quick Facts
Patent No.
US 3,947,314
App. No.
05/465,095
Filed
1974-04-29
Granted
1976-03-30
Kind
A