Granted Patent
Utility
US 4,489,506 · App. 06/431,399
Material treatment
Inventors:
Ernest C. Brown, Walter E. Buske, Norman A. Putnam
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Sep 30, 1982
Inventors
Ernest C. Brown
Walter E. Buske
Norman A. Putnam
Assignee (at issue)
Wolverine Corporation
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.