Granted Patent
Utility
US 3,949,966 · App. 05/573,376
Variable constant flow selector valve
Inventor:
Donald Clayton Fabish
Patented Case
View Patent ↗
Granted: Apr 13, 1976
Filed: Apr 30, 1975
Inventor
Donald Clayton Fabish
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.