Granted Patent
Utility
US 4,579,874 · App. 06/759,378
Polymer foam, thermoformed shapes thereof and methods of forming same
Inventors:
Charles M. Krutchen, Wen P. Wu
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Jul 26, 1985
Inventors
Charles M. Krutchen
Wen P. Wu
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.