Granted Patent
Utility
US 4,239,727 · App. 05/942,836
Method and apparatus for thermoforming thermoplastic foam articles
Inventors:
Donald W. Myers, Samantha L. Vivlamore
Patented Case
View Patent ↗
Granted: Dec 16, 1980
Filed: Sep 15, 1978
Inventors
Donald W. Myers
Samantha L. Vivlamore
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.