Granted Patent
Utility
US 4,620,562 · App. 06/663,811
High pressure regulator valve
Inventor:
Amos Pacht
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Oct 19, 1984
Inventor
Amos Pacht
Assignee (at issue)
Butterworth, Inc.
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.