Granted Patent
Utility
US 6,444,952 · App. 09/859,613
Engine block heater with retaining member
Inventors:
Steven W. Ballem, Daniel P. McNaught
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: May 17, 2001
Inventors
Steven W. Ballem
Daniel P. McNaught
Assignee (at issue)
Noma Company
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.