Granted Patent
Utility
US 4,327,136 · App. 06/181,769
Polymeric multi-layer sheet material and tray
Inventors:
Kenneth P. Thompson, Richard C. Ihde
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Aug 27, 1980
Inventors
Kenneth P. Thompson
Richard C. Ihde
Assignee (at issue)
Champion International Corporation Limited
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.