Granted Patent
Utility
US 4,638,150 · App. 06/632,776
Modular electrical heater
Inventor:
Wells Whitney
Patented Case
View Patent ↗
Granted: Jan 20, 1987
Filed: Jul 19, 1984
Inventor
Wells Whitney
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.