Joseph Han — 37 Patents at Fluidmaster

Joseph Han has been granted 37 US patents while listed as an inventor at Fluidmaster. The first was granted in 1987 and the most recent in September 2025. Joseph Han ranks #88,321 of 4,157,543 US inventors in our database (top 2.1%). Patent records list Joseph Han in Irvine, CA, US.

Issued Patents All Time

Showing 1–25 of 37 patents

Patent #	Title	Co-Inventors	Date	Approx Value ⓘ
12428827	Omni configured flapper systems for various flush valve sizes and methods of retrofit	Tuan Le, Leland Wong, Daniel McAuley, Jack Nguyen, Daniel McFarland +5 more	2025-09-30
11746922	Pneumatic lost motion/binary device system and method	Tuan Le	2023-09-05
11713817	Balanced activation force and bistable valve system and method	Tuan Le	2023-08-01
11643798	Modular fluid valve	Tuan Le, Salvador Pena	2023-05-09
11391391	Discharge valve system and method	Tuan Le	2022-07-19
11142898	Modular fluid valve	Tuan Le, Salvador Pena	2021-10-12
11125353	Pneumatic lost motion/binary device system and method	Tuan Le	2021-09-21
10767766	Discharge valve system and method	Tuan Le	2020-09-08
9650772	Float lock for a flush valve reservoir	Michael Lee, Kokon Zhang, Junsheng Chen	2017-05-16
9540798	Drain lock for a flush valve reservoir	Junsheng Chen	2017-01-10
8250681	Variable buoyancy setting flapper	—	2012-08-28
8104103	Toilet flapper flush valve assembly	—	2012-01-31
7900290	Dual flush refill device	—	2011-03-08
7559337	Retractable float for a ballcock valve	—	2009-07-14
7374123	Rewind mechanism	—	2008-05-20
6901610	High performance valve assembly for toilets	Robert M. Jensen	2005-06-07
6837448	Nozzle device for spraying defined areas	Giles A. Kendall	2005-01-04
6728975	High performance flush valve assembly	—	2004-05-04	$28,627,000
6715162	Toilet assembly	Aleksandr Prokopenko, Robert M. Jensen	2004-04-06	$29,912,000
6604249	Advanced dual-flush valve	John C. McKay, Tracy James Haggstrom, Farid Maiwandi	2003-08-12
6478237	Enclosed pop-up sprinklers with shielded impact arms	Don Michael Kearby, Giles A. Kendall, Derick C. Wright	2002-11-12
6442772	Advanced dual-flush valve	John C. McKay, Tracy James Haggstrom, Farid Maiwandi	2002-09-03
6209801	Closed-case impact sprinklers with fitted fluid seal assemblies	Don Michael Kearby, Giles A. Kendall, Derick C. Wright	2001-04-03
6182306	Side-mount toilet valve	—	2001-02-06
6155493	Closed-case impact sprinklers	Don Michael Kearby, Giles A. Kendall, Derick C. Wright	2000-12-05

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Joseph Han — 37 Patents

Issued Patents All Time

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