Granted Patent
Utility
US 5,117,556 · App. 07/626,191
Method for engine block heater installation
Inventor:
Ron Schaefer
Patented Case
View Patent ↗
Granted: Jun 2, 1992
Filed: Dec 12, 1990
Inventor
Ron Schaefer
Assignee (at issue)
Budd Canada, Inc.
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.