Granted Patent
Utility
US 4,424,287 · App. 06/272,155
Polymer foam process
Inventors:
D. Emil Johnson, Charles M. Krutchen, G. Vincent Sharps, Jr.
Patented Case
View Patent ↗
Granted: Jan 3, 1984
Filed: Jun 10, 1981
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.