Granted Patent
Utility
US 4,352,893 · App. 06/153,301
Production of foamed polymer
Inventors:
D. Emil Johnson, G. Vincent Sharps, Jr.
Patented Case
View Patent ↗
Granted: Oct 5, 1982
Filed: Jul 14, 1980
Inventors
D. Emil Johnson
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.