Granted Patent
Utility
US 4,596,377 · App. 06/642,472
Restrictor valve operator
Inventor:
Julian S. Taylor
Patented Case
View Patent ↗
Granted: Jun 24, 1986
Filed: Aug 20, 1984
Inventor
Julian S. Taylor
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.