Granted Patent
Utility
US 6,737,616 · App. 10/404,086
Open coil electric resistance heater using twisted resistance wires and methods of making
Inventor:
James L. Sherrill
Patented Case
View Patent ↗
Granted: May 18, 2004
Filed: Apr 2, 2003
Inventor
James L. Sherrill
Assignee (at issue)
TUTCO, LLC
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.