Granted Patent
Utility
US 4,243,374 · App. 05/936,114
Fluid flow sensing switch device and method of making the same
Inventor:
Roy C. Demi
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Aug 23, 1978
Inventor
Roy C. Demi
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.