Granted Patent
Utility
US 4,784,368 · App. 07/104,132
Self-closing valve for sanitary installations
Inventors:
Wilhelm Koch, Bernhard Burkard
Patented Case
View Patent ↗
Granted: Nov 15, 1988
Filed: Oct 5, 1987
Inventors
Wilhelm Koch
Bernhard Burkard
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.