Granted Patent
Utility
US 4,475,138 · App. 06/420,346
Circuit protection devices comprising PTC element
Inventors:
Lee M. Middleman, Frank A. Doljack
Patented Case
View Patent ↗
Granted: Oct 2, 1984
Filed: Sep 20, 1982
Inventors
Lee M. Middleman
Frank A. Doljack
Assignee (at issue)
Raychem Limited
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.