Granted Patent
Utility
US 4,224,962 · App. 05/934,175
Change valve
Inventor:
Willy Orszullok
Patented Case
View Patent ↗
Granted: Sep 30, 1980
Filed: Aug 16, 1978
Inventor
Willy Orszullok
Assignee (at issue)
ITT Industries
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.