Granted Patent
Utility
US 5,262,003 · App. 07/762,547
Method and system for defibering paper making materials
Inventors:
David E. Chupka, Peter Seifert
Patented Case
View Patent ↗
Granted: Nov 16, 1993
Filed: Sep 18, 1991
Inventors
David E. Chupka
Peter Seifert
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.