Granted Patent
Utility
US 4,364,523 · App. 06/130,886
Flow control technique
Inventors:
Richard G. Parkison, Edward G. Hofstetter, Jr.
Patented Case
View Patent ↗
Granted: Dec 21, 1982
Filed: Mar 17, 1980
Inventors
Richard G. Parkison
Edward G. Hofstetter, Jr.
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.