Granted Patent
Utility
US 4,558,716 · App. 06/487,457
Valve body for multiple valve insert packages
Inventor:
John D. Muchow
Patented Case
View Patent ↗
Granted: Dec 17, 1985
Filed: Apr 22, 1983
Inventor
John D. Muchow
Assignee (at issue)
Hydril Company
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.