Granted Patent
Utility
US 4,819,909 · App. 07/225,437
Self-closing valve for sanitary installations
Inventors:
Thomas G. Hart, Karl G. Ohaus, Earl W. Nickerson, David J. Meisner
Patented Case
View Patent ↗
Granted: Apr 11, 1989
Filed: Jul 28, 1988
Inventors
Thomas G. Hart
Karl G. Ohaus
Earl W. Nickerson
David J. Meisner
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.