Granted Patent
Utility
US 4,423,991 · App. 06/324,311
Cam activated planetary turning machine
Inventor:
Ralph Derr, Jr.
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Nov 23, 1981
Inventor
Ralph Derr, Jr.
Assignee (at issue)
Gulf Eastern Manufacturing 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.