Granted Patent
Utility
US 6,442,772 · App. 09/818,451
Advanced dual-flush valve
Inventors:
Joseph Han, John C. McKay, Tracy James Haggstrom, Farid Maiwandi
Patented Case
View Patent ↗
Granted: Sep 3, 2002
Filed: Mar 26, 2001
Inventors
Joseph Han
John C. McKay
Tracy James Haggstrom
Farid Maiwandi
Assignee (at issue)
FLUIDMASTER, 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.