Granted Patent
Utility
US 4,615,722 · App. 06/778,105
Valve block test apparatus
Inventors:
Leonard D. Steffan, Wilbur L. McCoy
Patented Case
View Patent ↗
Granted: Oct 7, 1986
Filed: Sep 20, 1985
Inventors
Leonard D. Steffan
Wilbur L. McCoy
Assignee (at issue)
Owens-Illinois 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.