Granted Patent
Utility
US 4,379,103 · App. 06/180,740
Method of forming a foam resin core structure having a smooth composite reinforced integral skin
Inventor:
Ralph G. Doerfling
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Aug 25, 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.