Water treatment Patent Leaders | Patent Leaderboard

Rankings count each patent once by its primary Cooperative Patent Classification. All-time pages aggregate the full database; year pages use patent grant year.

Recent years: 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025

Patents per Year

Top Inventors

Rank ↑	Inventor ↕	Patents ↕	Primary Company ↕
1	Joseph A. King	61	King Technology
2	Kazuyuki Yamasaki	45	Sharp Kabushiki Kaisha
3	Wilson K. Whitekettle	40	Betz Laboratories
#4	John Reid	38	Cameron Systems (Ireland) Limited
#5	Li-Shiang Liang	37	Evoqua Water Technologies
#6	Fu Chen	35	Betz Laboratories
#7	Deborah K. Donofrio	33	Betz Laboratories
#8	Pierre Cote	33	Zenon Environmental
#9	Tatsuo Sumino	32	Hitachi Plant Technologies
#10	William D. Chandler, Jr.	32	Chandler Systems
#11	Frederick C. Wilkins	29	Evoqua Water Technologies
#12	Hongqiang Ren	29	Nanjing University
#13	Prakash Narayan Govindan	28	Gradiant
#14	Darrell L. Gallup	27	Union Oil Company Of California
#15	Aaron R. Wolfe	26	Chandler Systems
#16	Cody A. Harbaugh	26	Chandler Systems
#17	Gary C. Ganzi	25	Evoqua Water Technologies
#18	Anil D. Jha	24	Siemens Water Technologies
#19	Maximus G. St. John	24	Gradiant
#20	Roy W. Martin	24	Truox
#21	Todd Foret	24	Foret Plasma Labs
#22	Dean Kamen	23	Deka Products Limited Parternship
#23	Jeffrey D. Johnson	23	King Technology
#24	Kazuyuki Sakata	23	Sharp Kabushiki Kaisha
#25	David A. Potts	22	—
#26	Herbert W. Holland	22	Wilsa Holdings
#27	Jasbir S. Gill	22	Ecolab Usa
#28	Jan D. Graves	22	Norwalk Wastewater Equipment
#29	Steven Lam	22	Gradiant
#30	Marcus G. Theodore	21	Earth Renaissance Technologies
#31	Stephen R. Vasconcellos	21	GE
#32	William B. Kerfoot	21	Thinkvillage-Kerfoot
#33	Chad L. Felch	20	Siemens Energy
#34	Kenneth A. Davis	20	S.I.P. Technologies L.L.C.
#35	Sudhir N. Murthy	20	D.C. Water And Sewer Authority
#36	William S. Carey	20	Betz Laboratories
#37	Bruce D. Burrows	19	Burrows Golf
#38	Hidayat Husain	19	Zenon Environmental
#39	John H. Lienhard	19	MIT
#40	Juan Carlos Josse	19	Anaergia
#41	Kazuichi Isaka	19	Hitachi Plant Technologies
#42	Michael D. Max	19	Marine Desalination Systems
#43	Jonathan N. Howarth	18	Albemarle
#44	Mansour S. Bader	18	—
#45	Raymond P. Denkewicz, Jr.	18	Fountainhead Technologies
#46	Abdelkader Gaid	17	Veolia Water Solutions & Technologies Support
#47	Christopher J. Nalepa	17	Albemarle
#48	David J. Emmons	17	Ademco
#49	Dodd W. Fong	17	Nalco Chemical
#50	Edward John Jordan	17	Siemens Water Technologies
#51	Ehud Levy	17	Selecto
#52	Evan E. Koslow	17	Koslow Technologies
#53	Jerry L. McKinney	17	Jerry L. Mckinney 2002 Trust
#54	Richard W. Christy	17	Rdp Technologies
#55	Arthur S. King	16	—
#56	Bernard F. Duesel, Jr.	16	Heartland Ag Tech
#57	Bernhard Wett	16	D.C. Water And Sewer Authority
#58	Bruce Lee Coulter	16	Evoqua Water Technologies
#59	Charles D. Blumenschein	16	Veolia Water Solutions & Technologies Support
#60	Chih M. Hwa	16	W.R. Grace & Co.-Conn.
#61	Don E. Heskett	16	Kdf Fluid Treatment
#62	John L. Featherstone	16	Union Oil Company Of California
#63	Masahiro Iseki	16	Sanyo Electric Co.
#64	Manian Ramesh	16	Nalco Chemical
#65	Steven Kristian Pedersen	16	Zenon Environmental
#66	Steven E. Woodard	16	Emerging Compounds Treatment Technologies
#67	Babiker Yagoub Elhadi Abdulkhair	15	Imam Mohammad Ibn Saud Islamic University
#68	Jack G. Frost	15	United Laboratories International
#69	John Tanner	15	Pur Water Purification Products
#70	Nobuyuki Ukai	15	Mitsubishi Electric
#71	Patrick Frazer	15	Chandler Systems
#72	Raleigh L. Cox	15	Pentair Pump Group
#73	Susumu Okino	15	Mitsubishi Electric
#74	Young I. Cho	15	Drexel University
#75	Yoshinori Nishiki	15	Permelec Electrode
#76	Zahid Amjad	15	—
#77	Akiyoshi Ohki	14	—
#78	Anthony L. Powell	14	1934612 Ontario
#79	Beidou Xi	14	Chinese Research Academy Of Environmental Sciences
#80	Brian E. Butters	14	1934612 Ontario
#81	Bryan J. Kumfer	14	Siemens Energy
#82	Charles E. Tharp	14	Environmental Dynamics
#83	David Clarke Pollock	14	Heidelberg Druckmaschinen
#84	Desmond A. Fraser	14	Reverse Ionizer Systems
#85	Hideo Suzuki	14	Yamaha
#86	Joseph D. Gifford	14	Evoqua Water Technologies
#87	Lili DING	14	Nanjing University
#88	Norimitsu Abe	14	Kabushiki Kaisha Toshiba
#89	Othman Charles Sadeq Al Hamouz	14	KFUPM
#90	Patrick J. Hughes	14	Rovi Technologies
#91	Roger P. Reid	14	Omnipure Filter Company
#92	Ryan K. LaRocque	14	Deka Products Limited Parternship
#93	Saravanan Kuppan	14	Robert Bosch Gmbh
#94	Sjoerd Hubertus Jozef Vellinga	14	Paques B.V.
#95	Sondra Hellstrom	14	Robert Bosch Gmbh
#96	Tawfik Abdo Saleh Awadh	14	—
#97	Wayne Ernest Conrad	14	Omachron Intellectual Property
#98	Wenjun Liu	14	Evoqua Water Technologies
#99	Whitney Rich	14	—
#100	Alexander Dobrinsky	13	Sensor Electronic Technology

Top Companies

Rank ↑	Company ↕	Patents ↕
1	Unknown	394
2	Nalco Chemical	206
3	Betz Laboratories	167
#4	GE	137
#5	Evoqua Water Technologies	124
#6	Ecolab Usa	119
#7	Kurita Water Industries	115
#8	Veolia Water Solutions & Technologies Support	83
#9	KFUPM	82
#10	Mitsubishi Electric	81
#11	Calgon	72
#12	E.I. Du Pont De Nemours And	67
#13	ExxonMobil	64
#14	Basf Se	62
#15	Samsung	61
#16	Degremont	60
#17	Panasonic	59
#18	Nanjing University	57
#19	Chevron	56
#20	Sharp Kabushiki Kaisha	55
#21	University of California	52
#22	Hitachi	50
#23	Kabushiki Kaisha Toshiba	50
#24	Siemens Water Technologies	49
#25	MIT	48
#26	Saudi Arabian Oil	48
#27	Betzdearborn	47
#28	Eastman Kodak	47
#29	LG	47
#30	Organo	46
#31	Trojan Technologies	45
#32	Cytec Technology	44
#33	US Air Force	44
#34	Bayer Healthcare	42
#35	Union Oil Company Of California	42
#36	King Technology	41
#37	Ebara	40
#38	Nalco Company	40
#39	Olin	40
#40	United States Filter	40
#41	Baker Hughes Holdings	38
#42	Rohm And Haas	37
#43	Phillips Petroleum	36
#44	Tongji University	36
#45	Kemira Oyj	35
#46	ITRI	34
#47	W.R. Grace & Co.-Conn.	33
#48	Sanyo Electric Co.	32
#49	3M	31
#50	Brita Lp	31
#51	Linde Gmbh	31
#52	Chandler Systems	30
#53	Council Of Scientific And Industrial Research	30
#54	Fmc	30
#55	Albemarle	29
#56	Bl Technologies	27
#57	Deka Products Limited Parternship	27
#58	Zenon Environmental	27
#59	Air Products And Chemicals	26
#60	Dow Global Technologies	26
#61	ICI	26
#62	Siemens Energy	26
#63	Uop	26
#64	Ciba-Geigy	25
#65	Hoechst Gmbh	25
#66	USDA	25
#67	Degussa Ag	24
#68	Foret Plasma Labs	24
#69	Doosan Heavy Industries & Construction Co.	23
#70	Hitachi Plant Technologies	23
#71	Kinetico Incorporated	23
#72	Korea Institute Of Science And Technology	23
#73	Truox	23
#74	Battelle Memorial Institute	22
#75	Bio-Lab	22
#76	Chemtreat	22
#77	Metawater Co.	22
#78	Whirlpool	22
#79	IBM	22
#80	Chinese Research Academy Of Environmental Sciences	21
#81	Culligan International	21
#82	Earth Renaissance Technologies	21
#83	Halliburton Energy Services	21
#84	King Abdulaziz University	21
#85	Otv Sa	21
#86	US Dept of the Interior	21
#87	Allied Colloids Limited	20
#88	Anaergia	20
#89	Kubota	20
#90	Nippon Shokubai Co.	20
#91	Ovivo	20
#92	Access Business Group International	19
#93	Ciba Specialty Chemicals Water Treatments	19
#94	Envirex	19
#95	Gradiant	19
#96	King Abdulaziz City For Science And Technology	19
#97	Suez International	19
#98	University Of South Florida	19
#99	Honeywell	19
#100	Buckman Laboratories International	18

Water treatment Patent Leaders All Time

Patents per Year

Top Inventors

Top Companies