Granted Patent
Utility
US 4,399,428 · App. 06/115,413
Thermostat
Inventors:
Paul R. Hughes, John E. Campbell
Patented Case
View Patent ↗
Granted: Aug 16, 1983
Filed: Jan 25, 1980
Inventors
Paul R. Hughes
John E. Campbell
Assignee (at issue)
United Brands 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.