Granted Patent
Utility
US 4,422,667 · App. 06/335,872
Suspension for a tractor-scraper
Inventor:
Gary D. Perry
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Dec 30, 1981
Inventor
Gary D. Perry
Assignee (at issue)
Eagle-Picher Industries, 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.