Granted Patent
Utility
US 4,691,861 · App. 06/900,439
Valve construction and method of making the same
Inventors:
Boyd P. Sliger, Joseph P. Wagner
Patented Case
View Patent ↗
Granted: Sep 8, 1987
Filed: Aug 26, 1986
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.