Granted Patent
Utility
US 4,294,289 · App. 06/114,818
Flow control device
Inventor:
Armin Fischer
Patented Case
View Patent ↗
Granted: Oct 13, 1981
Filed: Jan 24, 1980
Inventor
Armin Fischer
Assignee (at issue)
American Standard Inc.
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.