Granted Patent
Utility
US 4,372,900 · App. 06/206,496
Method of forming reinforced foam structure
Inventor:
Ralph G. Doerfling
Patented Case
View Patent ↗
Granted: Feb 8, 1983
Filed: Nov 13, 1980
Inventor
Ralph G. Doerfling
Assignee (at issue)
Detroit Gasket & Manufacturing Co.
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.