Granted Patent
Utility
US 4,451,725 · App. 06/400,620
Electrical heating unit for sealing vacuum electron tubes
Inventor:
James Mount
Patented Case
View Patent ↗
Granted: May 29, 1984
Filed: Jul 22, 1982
Inventor
James Mount
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.