Granted Patent
Utility
US 4,685,652 · App. 06/870,363
Valve construction and method of making the same
Inventor:
Harvey J. Shopsky
Patented Case
View Patent ↗
Granted: Aug 11, 1987
Filed: Jun 4, 1986
Inventor
Harvey J. Shopsky
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.