Granted Patent
Utility
US 4,379,220 · App. 06/218,445
Method of heating liquid
Inventors:
Lee M. Middleman, Roger S. Goodrich
Patented Case
View Patent ↗
Granted: Apr 5, 1983
Filed: Dec 19, 1980
Inventors
Lee M. Middleman
Roger S. Goodrich
Assignee (at issue)
Raychem 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.