Granted Patent
Utility
US 4,426,036 · App. 06/407,503
Valve construction and method of making the same
Inventor:
Boyd P. Sliger
Patented Case
View Patent ↗
Granted: Jan 17, 1984
Filed: Aug 12, 1982
Inventor
Boyd P. Sliger
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.