Granted Patent
Utility
US 4,487,222 · App. 06/491,282
Poppet type fluid valve with replaceable wear surface
Inventor:
Richard CRAWFORD
Patented Case
View Patent ↗
Granted: Dec 11, 1984
Filed: May 3, 1983
Inventor
Richard CRAWFORD
Assignee (at issue)
Armco 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.