Granted Patent
Utility
US 5,120,771 · App. 07/406,974
Process for the production of polyurethane foam
Inventor:
Graham D. Walmsley
Patented Case
View Patent ↗
Granted: Jun 9, 1992
Filed: Sep 13, 1989
Inventor
Graham D. Walmsley
Assignee (at issue)
HICKORY SPRINGS MANUFACTURING COMPANY
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.