Granted Patent
Utility
US 4,675,964 · App. 06/813,173
Titanium engine valve and method of making
Inventor:
John E. Allison
Patented Case
View Patent ↗
Granted: Jun 30, 1987
Filed: Dec 24, 1985
Inventor
John E. Allison
Assignee (at issue)
Ford Motor 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.