Granted Patent
Utility
US 6,205,648 · App. 09/033,791
Electric heater unit and method of manufacture
Inventor:
John T. Hughes
Patented Case
View Patent ↗
Granted: Mar 27, 2001
Filed: Mar 3, 1998
Inventor
John T. Hughes
Assignee (at issue)
Ceramaspeed, 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.