Fluid systems and actuators Patent Leaders

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	Kurt Stoll	89	Festo Ag & Co. Kg
2	Tadeusz Budzich	46	Caterpillar
3	Makoto Ishikawa	35	Smc
#4	Herbert Baltes	34	Hydac Technology Gmbh
#5	Bunya Hayashi	32	Smc
#6	Pengfei Ma	30	Caterpillar
#7	Paul P. Weyer	27	1994 Weyer Family Limited Partnership
#8	Wolfgang Kauss	27	Mannesmann Rexroth Ag
#9	Shinji Miyazoe	26	Smc
#10	Akihiro Kondo	25	Kawasaki
#11	Joseph L. Pfaff	24	Husco International
#12	Peter Kloft	23	Hydac Technology Gmbh
#13	Kouji Ishikawa	22	Hitachi Construction Machinery Co.
#14	Genroku Sugiyama	21	Hitachi Construction Machinery Co.
#15	Danielle A. Fong	20	Lightsail Energy
#16	Edwin P. Berlin, Jr.	20	Lightsail Energy
#17	Jiao Zhang	20	Caterpillar
#18	Naoki Ishizaki	20	Komatsu
#19	Stephen E. Crane	20	Lightsail Energy
#20	Toichi Hirata	20	Hitachi Construction Machinery Co.
#21	Kartikeya Mahalatkar	19	Lightsail Energy
#22	Meng Wang	19	Eaton Intelligent Power Limited
#23	Norbert Weber	19	Hydac Technology Gmbh
#24	Todd Bowers	19	Lightsail Energy
#25	Yongxi Hou	19	Lightsail Energy
#26	Benjamin R. Bollinger	18	Sustainx
#27	James A. Neff	18	Mac Valves
#28	Troy O. McBride	18	Sustainx
#29	Bernd Zähe	17	Sun Hydraulics
#30	Bo Vigholm	17	Volvo Construction Equipment Ab
#31	Keitaro Yonezawa	17	Kosmek
#32	Paul Wayne Schmidt	17	Vortex Pipe Systems
#33	Avijit Ghosh	16	Vortex Pipe Systems
#34	Hideyasu Muraoka	16	Kawasaki
#35	Karl E. Stahlkopf	16	Lightsail Energy
#36	Michael Berne Rannow	16	Eaton Intelligent Power Limited
#37	Hiroyuki Asahara	15	Smc
#38	Martin Heusser	15	Heilmeier & Weinlein Fabrik F. Oel-Hydraulik Gmbh & Co. Kg
#39	Mitsuo Noda	15	Howa Machinery
#40	Rudolf Moller	15	Mannesmann Ag
#41	Siegfried Zenker	15	Danfoss A/S
#42	Tatsuhiro Arikawa	15	Eagle Industry Co.
#43	Youji Takakuwa	15	Smc
#44	Dwight B. Stephenson	14	Eaton
#45	Josef Bueter	14	Buemach Engineering International B.V.
#46	Peter Bruck	14	Hydac Fluidtechnik Gmbh
#47	Thorkild Christensen	14	Danfoss A/S
#48	Tonglin Shang	14	Caterpillar
#49	Abduz Zahid	13	Greer Hydraulics, Incorporated
#50	AmirHossein Pourmousa Abkenar	13	Lightsail Energy
#51	Armin Stellwagen	13	Mannesmann Rexroth Ag
#52	Helmut Gottling	13	Mannesmann Ag
#53	Jason L. Brinkman	13	Caterpillar
#54	Koji Ueda	13	Kobelco Construction Machinery Co.
#55	Shinya Imura	13	Hitachi Construction Machinery Co.
#56	Svend E. Thomsen	13	Danfoss A/S
#57	Teruo Akiyama	13	Komatsu
#58	Yuji Fukuda	13	Kubota
#59	Yusuke Kajita	13	Hitachi Construction Machinery Co.
#60	Austin Schneider	12	Crystaphase Products
#61	Dayao Chen	12	Caterpillar
#62	Daniel Theobald	12	Vecna Robotics
#63	Dennis R. Barber	12	Husco International
#64	Eric P. Hamkins	12	Husco International
#65	George M. Whitesides	12	Harvard University
#66	Hideharu Sato	12	Smc
#67	John N. Glover	12	Crystaphase Products
#68	Kazunori Yoshino	12	Shin Caterpillar Mitsubishi
#69	Kengo Monden	12	Smc
#70	Keith A. Tabor	12	Husco International
#71	Marcus Bitter	12	John Deere
#72	Pawel A. Sobolewski	12	Woodward
#73	Peter Ham	12	Crystaphase Products
#74	Raymond Keith Foster	12	Keith Investments
#75	Tadao Karakama	12	Komatsu Shisakusho
#76	Thomas J. Hajek, Jr.	12	Caterpillar
#77	Toshio Sato	12	Smc
#78	Winfried Rüb	12	Hydac Filtertechnik Gmbh
#79	Daniel Bouteille	11	La Telemecanique Electric
#80	Joseph H. Kim	11	Woodward
#81	Kazunori Nakamura	11	Hitachi Construction Machinery Co.
#82	Lawrence F. Yuda	11	Compact Air Products
#83	Michael Paul Rowe	11	Toyota
#84	Patrick Opdenbosch	11	Caterpillar
#85	Robert P. O'Hara	11	Woodward
#86	Ronald D. Stouffer	11	Bowles Fluidics
#87	Walter Kropp	11	Linde Gmbh
#88	Yasutaka Tsuruga	11	Hitachi Construction Machinery Co.
#89	Akihiro Kazama	10	Smc
#90	Aleksandar Egelja	10	Caterpillar
#91	Brian Slattery	10	Parker-Hannifin
#92	Chiaki Fukui	10	Smc
#93	Gerhard Huber	10	Hoerbiger Hydraulik Gmbh
#94	George Kadlicko	10	Haldex Hydraulics
#95	Gerhard Scharnowski	10	Mannesmann Ag
#96	Junya Kaneko	10	Smc
#97	Kamran Eftekhari Shahroudi	10	Woodward
#98	Kenneth W. Junk	10	Fisher Controls International
#99	Kiwamu Takahashi	10	Hitachi Construction Machinery Tierra Co.
#100	Masayuki Nakamura	10	Hitachi

Top Companies

Rank ↑	Company ↕	Patents ↕
1	Caterpillar	372
2	Smc	321
3	Robert Bosch Gmbh	160
#4	John Deere	127
#5	Hitachi Construction Machinery Co.	107
#6	Parker-Hannifin	99
#7	Komatsu	82
#8	Mannesmann Rexroth Ag	81
#9	The Boeing	79
#10	Eaton	76
#11	Festo Ag &	75
#12	Hydac Technology Gmbh	71
#13	Husco International	66
#14	Festo Ag & Co. Kg	64
#15	Hamilton Sundstrand	64
#16	Unknown	55
#17	Kyb	49
#18	General Motors	49
#19	Honeywell	49
#20	Volvo Construction Equipment Ab	48
#21	RTX (Raytheon)	48
#22	Kawasaki	46
#23	Bosch Rexroth	42
#24	Festo Se & Co. Kg	40
#25	US Air Force	40
#26	Fisher Controls International	39
#27	Komatsu Shisakusho	39
#28	Woodward	38
#29	GE	37
#30	Danfoss A/S	36
#31	Vickers	36
#32	Zf Friedrichshafen Ag	36
#33	Toyota	36
#34	Kubota	32
#35	Eaton Intelligent Power Limited	31
#36	Kobelco Construction Machinery Co.	31
#37	Ross Operating Valve	30
#38	Kayaba Industry Co.	29
#39	Mac Valves	29
#40	Shin Caterpillar Mitsubishi	29
#41	Clark Equipment	28
#42	Honda Motor Co.	28
#43	Moog	28
#44	Volvo Construction Equipment Holding Sweden Ab	27
#45	Cnh Industrial America	26
#46	Eagle Industry Co.	25
#47	Kosmek	25
#48	Sauer-Danfoss Aps	25
#49	Sun Hydraulics	25
#50	Dresser Industries	24
#51	Toyota Industries	24
#52	Case Gmbh	23
#53	Hitachi	23
#54	Hr Textron	23
#55	Mannesmann Ag	23
#56	Norgren Limited	23
#57	US Army	23
#58	Bowles Fluidics	21
#59	Hydac Fluidtechnik Gmbh	21
#60	Teijin Seiki Co.	21
#61	Samsung	21
#62	Airbus Operations Limited	20
#63	Lightsail Energy	20
#64	Linde Gmbh	20
#65	Siemens Aktiengesellschaft	20
#66	Advics Co.	19
#67	Actuant	18
#68	Howa Machinery	18
#69	Koganei	18
#70	Sundstrand	18
#71	Sustainx	18
#72	Hawe Hydraulik Se	17
#73	J. I. Case	17
#74	Kobe Steel	17
#75	Harvard University	17
#76	Schaeffler	17
#77	Ford	17
#78	Heilmeier & Weinlein Fabrik F. Oel-Hydraulik Gmbh & Co. Kg	16
#79	Showa	16
#80	Borgwarner	15
#81	Ckd	15
#82	Continental Teves Ag & Co. Ohg	15
#83	Mitsubishi Electric	15
#84	Samson Aktiengesellschaft	15
#85	Swagelok	15
#86	Vortex Pipe Systems	15
#87	Lockheed Martin	15
#88	Ab Rexroth Mecman	14
#89	Cameron International	14
#90	Doosan Infracore Co.	14
#91	Greer Hydraulics, Incorporated	14
#92	Illinois Tool Works	14
#93	MIT	14
#94	Nabtesco	14
#95	Pneumo	14
#96	Voith Patent Gmbh	14
#97	Bendix Limited	13
#98	Bridgestone	13
#99	Cnh America	13
#100	Commercial Shearing	13

Fluid systems and actuators Patent Leaders All Time

Patents per Year

Top Inventors

Top Companies