Granted Patent
Utility
US 6,041,809 · App. 08/811,654
Two stage flush control valve assembly
Inventor:
Dwight N. Johnson
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Mar 5, 1997
Inventor
Dwight N. Johnson
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.