Granted Patent
Utility
US 5,369,874 · App. 08/192,989
Method of manufacturing a radiant electric heater
Inventor:
Joseph A. McWilliams
Patented Case
View Patent ↗
Granted: Dec 6, 1994
Filed: Feb 8, 1994
Inventor
Joseph A. McWilliams
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.