Granted Patent
Utility
US 4,302,992 · App. 06/113,054
Piston turning machine
Inventor:
Frank C. Skrentner
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Jan 17, 1980
Inventor
Frank C. Skrentner
Assignee (at issue)
F. Jos. Lamb 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.