Granted Patent
Utility
US 4,446,608 · App. 06/401,873
Valve spring compressor for internal combustion engine
Inventor:
Joel S. Johnson
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Jul 26, 1982
Inventor
Joel S. Johnson
Assignee (at issue)
Kent-Moore 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.