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.