Granted Patent
Utility
US 4,147,180 · App. 05/808,875
Condition responsive valve construction
Inventor:
Everett T. Steele, Jr.
Patented Case
View Patent ↗
Granted: Apr 3, 1979
Filed: Jun 22, 1977
Inventor
Everett T. Steele, Jr.
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.