Granted Patent
Utility
US 4,393,438 · App. 06/328,435
Porcelain coated metal boards having interconnections between the face and reverse surfaces thereof
Inventor:
Robert L. Schelhorn
Patented Case
View Patent ↗
Granted: Jul 12, 1983
Filed: Dec 7, 1981
Inventor
Robert L. Schelhorn
Assignee (at issue)
RCA Corporation
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.