Granted Patent
Utility
US 4,234,011 · App. 06/100,316
Plug valve construction
Inventors:
Earl A. Bake, E. Frederick Schoeneweis
Patented Case
View Patent ↗
Granted: Nov 18, 1980
Filed: Dec 5, 1979
Inventors
Earl A. Bake
E. Frederick Schoeneweis
Assignee (at issue)
Rockwell International Corporation
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.