Granted Patent
Utility
US 4,168,722 · App. 05/851,136
Feather valve
Inventors:
Thomas Mayer, A. Hunt Davis, Ronald Beyer
Patented Case
View Patent ↗
Granted: Sep 25, 1979
Filed: Nov 14, 1977
Inventors
Thomas Mayer
A. Hunt Davis
Ronald Beyer
Assignee (at issue)
Worthington Compressors, 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.