Granted Patent
Utility
US 5,847,368 · App. 08/667,148
Electric heating unit and method of producing same
Inventor:
Yasuo Sugiyama
Patented Case
View Patent ↗
Granted: Dec 8, 1998
Filed: Jun 20, 1996
Inventor
Yasuo Sugiyama
Assignee (at issue)
Koyo Lindberg 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.