Granted Patent
Utility
US 4,247,506 · App. 05/907,540
Processing extruded elastomers
Inventor:
James W. Summers
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: May 19, 1978
Inventor
James W. Summers
Assignee (at issue)
B. F. Goodrich 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.