Granted Patent
Utility
US 4,196,251 · App. 06/030,209
Rigidized resinous foam core sandwich structure
Inventor:
Leo J. Windecker
Patented Case
View Patent ↗
Granted: Apr 1, 1980
Filed: Apr 16, 1979
Inventor
Leo J. Windecker
Assignee (at issue)
International Harvester 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.