Granted Patent
Utility
US 4,408,178 · App. 06/397,140
Thermostatic switch
Inventors:
Tore B. Hanssen, Chester S. Zwirek
Patented Case
View Patent ↗
Granted: Oct 4, 1983
Filed: Jul 12, 1982
Inventors
Tore B. Hanssen
Chester S. Zwirek
Assignee (at issue)
The Singer Company 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.