Granted Patent
Utility
US 4,844,429 · App. 07/181,807
Die spring construction
Inventor:
Jack D. Ecktman
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Apr 15, 1988
Inventor
Jack D. Ecktman
Assignee (at issue)
The Firestone Tire & Rubber Company
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.