Granted Patent
Utility
US 4,187,270 · App. 05/905,901
Extrusion apparatus
Inventor:
David E. Bartrum
Patented Case
View Patent ↗
Granted: Feb 5, 1980
Filed: May 15, 1978
Inventor
David E. Bartrum
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.