Granted Patent
Utility
US 4,969,628 · App. 07/439,599
Valve construction and method of making the same
Inventors:
Richard B. Reich, George W. Feild
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Nov 20, 1989
Inventors
Richard B. Reich
George W. Feild
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.