Granted Patent
Utility
US 4,889,975 · App. 07/168,650
Self-regulating heater having a heat tape that stops tracking
Inventors:
Richard W. Farkas, David Rock, James H. Anderson
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Mar 16, 1988
Inventors
Richard W. Farkas
David Rock
James H. Anderson
Assignee (at issue)
Fluorocarbon 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.