Granted Patent
Utility
US 4,492,210 · App. 06/467,774
Serviceable valve construction
Inventor:
Donald E. Hunt
Patented Case
View Patent ↗
Granted: Jan 8, 1985
Filed: Feb 18, 1983
Inventor
Donald E. Hunt
Assignee (at issue)
Ballwin-Washington, 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.