Granted Patent
Utility
US 4,344,710 · App. 06/205,353
Polymer foam extrusion system
Inventors:
D. Emil Johnson, Charles M. Krutchen, G. Vincent Sharps, Jr.
Patented Case
View Patent ↗
Granted: Aug 17, 1982
Filed: Nov 10, 1980
Inventors
D. Emil Johnson
Charles M. Krutchen
G. Vincent Sharps, Jr.
Assignee (at issue)
Mobil Oil 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.