Granted Patent
Utility
US 4,538,644 · App. 06/502,699
Pressure regulator
Inventors:
Dale A. Knutson, Frank M. Fritz
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Jun 9, 1983
Inventors
Dale A. Knutson
Frank M. Fritz
Assignee (at issue)
Applied Power 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.