Granted Patent
Utility
US 4,237,608 · App. 05/950,848
Method of making an electrical heater construction
Inventor:
Hugh J. Tyler
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Oct 12, 1978
Inventor
Hugh J. Tyler
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE 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.