Granted Patent
Utility
US 4,903,944 · App. 07/304,268
Valve assembly and method
Inventors:
James K. Butzen, Kenneth C. Happ
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Jan 31, 1989
Inventors
James K. Butzen
Kenneth C. Happ
Assignee (at issue)
Snap-on Tools 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.