Granted Patent
Utility
US 4,401,263 · App. 06/265,599
Pneumatic relay controlled transducer construction
Inventor:
James A. Crowson
Patented Case
View Patent ↗
Granted: Aug 30, 1983
Filed: May 20, 1981
Inventor
James A. Crowson
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.