Granted Patent
Utility
US 4,630,770 · App. 06/791,378
Valve construction and method of making the same
Inventors:
Boyd P. Sliger, Joseph P. Wagner
Patented Case
View Patent ↗
Granted: Dec 23, 1986
Filed: Oct 25, 1985
Inventors
Boyd P. Sliger
Joseph P. Wagner
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.