Granted Patent
Utility
US 4,422,844 · App. 06/229,517
Snap acting thermostatic fluid valve and electrical switch coupled thereto
Inventors:
Marvin M. Graham, Jay R. Katchka
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: Jan 29, 1981
Inventors
Marvin M. Graham
Jay R. Katchka
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE 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.