Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
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Hydraulic and foundation engineering Patent Leaders in 2021 2021

Primary CPC class E02 · Section E

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: 2016201720182019202020212022202320242025

Patents per Year

Patents granted per year, 1996 to 2025Bar chart with a peak of 913 patents in 2024.peak 9131996: 398 patents19961997: 303 patents1998: 407 patents1999: 447 patents19992000: 429 patents2001: 443 patents2002: 442 patents20022003: 459 patents2004: 388 patents2005: 349 patents20052006: 391 patents2007: 290 patents2008: 293 patents20082009: 345 patents2010: 438 patents2011: 403 patents20112012: 371 patents2013: 530 patents2014: 692 patents20142015: 728 patents2016: 681 patents2017: 735 patents20172018: 678 patents2019: 826 patents2020: 788 patents20202021: 716 patents2022: 741 patents2023: 717 patents20232024: 913 patents2025: 904 patents2025

Top Inventors

Rank ↑ Inventor ↕ Patents ↕ Primary Company ↕
1 Yuji Fukuda 11 Kubota
2 Eiji Ishibashi 10 Komatsu
3 Hiroshi Sakamoto 8 Hitachi
#4 Thomas Marshall Congdon 8 Caterpillar
#5 Akifumi Inamaru 7 Komatsu
#6 Andrew Xiao Liang 7 Built Robotics
#7 Christian John Wawrzonek 7 Built Robotics
#8 Cyrus McMann Ready-Campbell 7 Built Robotics
#9 Edward Stephen Walker, Jr. 7 Built Robotics
#10 Linus Page Chou 7 Built Robotics
#11 Michael G. Kean 7 John Deere
#12 Noah Austen Ready-Campbell 7 Built Robotics
#13 Takeya IZUMIKAWA 7 Sumitomo Construction Machinery Co.
#14 Douglas C. Serrurier 6 Caterpillar
#15 Eric T. Sinn 6 Caterpillar
#16 Hidekazu Moriki 6 Hitachi Construction Machinery Co.
#17 Manabu Edamura 6 Hitachi Construction Machinery Co.
#18 Michael D. Peat 6 John Deere
#19 Yasuhito Yonezawa 6 Komatsu
#20 Aaron R. Kenkel 5 John Deere
#21 David J. Myers 5 W.L. Gore & Associates Gmbh
#22 David Bruno Parzynski, Jr. 5 Caterpillar
#23 Hiromasa Takahashi 5 Hitachi
#24 Juri Shimizu 5 Hitachi Construction Machinery Co.
#25 Kenji Hiraku 5 Hitachi Construction Machinery Co.
#26 Kiwamu Takahashi 5 Hitachi Construction Machinery Tierra Co.
#27 Mohamad Youssef Bilal 5 Hensley Industries
#28 Nathan Bjerke 5 Caterpillar
#29 Seiji Nagano 5 Komatsu
#30 Yosuke Kogawa 5 Komatsu
#31 Akihiro Kondo 4 Kawasaki
#32 Brian K. Kellogg 4 John Deere
#33 John R. Mahrenholz 4 John Deere
#34 Kazuhiro Hashimoto 4 Komatsu
#35 Katsuaki Kodaka 4 Hitachi Construction Machinery Co.
#36 Lance R. Sherlock 4 John Deere
#37 Shinya Imura 4 Hitachi Construction Machinery Co.
#38 Shiho Izumi 4 Hitachi Construction Machinery Co.
#39 Takaaki CHIBA 4 Hitachi Construction Machinery Co.
#40 Taihei Maehara 4 Hitachi Construction Machinery Tierra Co.
#41 Woo Yong Jung 4 Doosan Infracore Co.
#42 Yasutaka Tsuruga 4 Hitachi Construction Machinery Co.
#43 Yutaka Ono 4 Komatsu
#44 Ahmed Phuly 3 —
#45 Brett S. Graham 3 John Deere
#46 Chang-mook Kim 3 Doosan Infracore Co.
#47 Corey Lee Gorman 3 Caterpillar
#48 Corey Michael Wells 3 Caterpillar
#49 Daniel Flanigan 3 Tesla
#50 Daniel J. Krieger 3 Clark Equipment
#51 David J. White 3 Geopier Foundation Company
#52 Fuming Wang 3 Safekey Engineering Technology (Zhengzhou)
#53 Hajime Yoshida 3 Hajime Industries
#54 Hideyasu Muraoka 3 Kawasaki
#55 Hideki Nakajima 3 Caterpillar
#56 Hisami NAKANO 3 Hitachi Construction Machinery Co.
#57 Hongyuan Fang 3 Welead Infrastructure Engineering Technology (Zhengzhou)
#58 Ignacio Alonso Martinez 3 John Deere
#59 Iqbal Hussain 3 Saudi Arabian Oil
#60 Isamu Aoki 3 Hitachi Construction Machinery Co.
#61 Isai Diaz 3 Hensley Industries
#62 Jason Jura 3 Caterpillar
#63 John M. Hageman 3 John Deere
#64 Junji Harada 3 Komatsu
#65 Jun Tomita 3 Kubota
#66 Keigo Honda 3 Kubota
#67 Kenjiro Shimada 3 Komatsu
#68 Kenji Yamamoto 3 Sony
#69 Koji Hyodo 3 Hitachi Construction Machinery Co.
#70 Koji Ueda 3 Kobelco Construction Machinery Co.
#71 Kunitsugu Tomita 3 Hitachi Construction Machinery Co.
#72 Mark J. Cherney 3 John Deere
#73 Masatoshi KOZUI 3 Kobelco Construction Machinery Co.
#74 Natsuki Nakamura 3 Hitachi Construction Machinery Tierra Co.
#75 Nicholas Rokusek 3 John Deere
#76 Noah D. Cowgill 3 Esco Group
#77 Peng Zhao 3 Huawei
#78 Rammagy Yoeu 3 Caterpillar
#79 Rustin Glenn Metzger 3 Caterpillar
#80 Satoshi Nakamura 3 Ricoh Company
#81 Scott S. Hendron 3 John Deere
#82 Takashi Hiekata 3 Kobe Steel
#83 Takeshi Ishii 3 Hitachi Construction Machinery Tierra Co.
#84 Tarik Loukili 3 John Deere
#85 Takaaki Morimoto 3 Sumitomo Construction Machinery Co.
#86 Takahisa Oasa 3 Komatsu
#87 Takeo Yamada 3 Hitachi
#88 Teppei Saitou 3 Hitachi Construction Machinery Co.
#89 Tetsuji Tanaka 3 Sumitomo Wiring Systems
#90 Thibault Villette 3 Saudi Arabian Oil
#91 Timothy M. O'Donnell 3 —
#92 Tommy Olsson 3 Husqvarna Ab
#93 Todd F. Velde 3 John Deere
#94 Waheed Alrafaei 3 Saudi Arabian Oil
#95 Xianfeng Zhao 3 Safekey Engineering Technology (Zhengzhou)
#96 Yanhui Pan 3 Welead Infrastructure Engineering Technology (Zhengzhou)
#97 Yoshifumi Takebayashi 3 Hitachi Construction Machinery Tierra Co.
#98 Yoshimitsu Tanaka 3 Kubota
#99 Yusuke Suzuki 3 Toyota
#100 Adam Nackers 2 Caterpillar

Top Companies

Rank ↑ Company ↕ Patents ↕
1 Caterpillar 65
2 Komatsu 50
3 Hitachi Construction Machinery Co. 43
#4 John Deere 42
#5 Kubota 18
#6 Sumitomo Construction Machinery Co. 17
#7 Kobelco Construction Machinery Co. 15
#8 Clark Equipment 11
#9 Unknown 10
#10 Cnh Industrial America 9
#11 Joy Global Surface Mining 9
#12 Doosan Infracore Co. 8
#13 Volvo Construction Equipment Ab 8
#14 Built Robotics 7
#15 Hitachi Construction Machinery Tierra Co. 7
#16 Kawasaki 7
#17 Esco Group 5
#18 Hensley Industries 5
#19 Cashman Dredging And Marine Contracting, Co. 4
#20 Husqvarna Ab 4
#21 J. C. Bamford Excavators Limited 4
#22 Kobe Steel 4
#23 Ojjo 4
#24 Liebherr-Hydraulikbagger Gmbh 3
#25 Neenah Foundry 3
#26 Saudi Arabian Oil 3
#27 Siemens Gamesa Renewable Energy 3
#28 Welead Infrastructure Engineering Technology (Zhengzhou) 3
#29 Cqms Pty 2
#30 Gustomsc B.V. 2
#31 Harbo Technologies 2
#32 Holcim Technology 2
#33 Hubbell Incorporated 2
#34 Infrastructure Renewal Institute Of Southern China 2
#35 Innogy Se 2
#36 Korea Institute Of Civil Engineering And Building Technology 2
#37 Liebherr-Werk Nenzing Gmbh 2
#38 Maersk Drilling A/S 2
#39 Metalogenia Research & Technologies, S.L. 2
#40 Mono Slab Ez Form 2
#41 Mortarless Technologies 2
#42 Oldcastle Infrastructure 2
#43 Parker-Hannifin 2
#44 Ponsse Oyj 2
#45 Predl Systems North America 2
#46 Rockland Manufacturing 2
#47 Ørsted Wind Power A/S 2
#48 Subsea 7 Norway As 2
#49 Sumitomo Heavy Industries 2
#50 The Toro 2
#51 The Yokohama Rubber Co. 2
#52 Vermeer Manufacturing 2
#53 Wirtgen Gmbh 2
#54 Zhejiang Ocean University 2
#55 Zhejiang University 2
#56 Abi Anlagentechnik-Baumaschinen-Industriebedarf Maschinenfabrik Und Vertriebsgesellschaft Mbh 1
#57 Abi Attachments 1
#58 Acciona Windpower, S.A. 1
#59 Afs Newco 1
#60 Arrowhead Center 1
#61 Artemis Intelligent Power Limited 1
#62 Artisan Vehicle Systems 1
#63 Autonomous Solutions 1
#64 A. Y. Mcdonald Mfg. 1
#65 Bauer Maschinen Gmbh 1
#66 Beijing Baidu Netcom Science Technology Co. 1
#67 Berkel & Company Contractors 1
#68 Bernard Mccartney Limited 1
#69 Bluemarine Offshore Yard Service B.V. 1
#70 Cciip 1
#71 Chongqing Jiaotong University 1
#72 Cleveland Reclaim Industries 1
#73 Climate 1
#74 Consolidated Edison Company Of New York 1
#75 Contech Engineered Solutions 1
#76 Cpac Systems Ab 1
#77 Crystal Lagoons Technologies 1
#78 Cummins 1
#79 Dalian University Of Technology 1
#80 Deepwater Corrosion Services 1
#81 Delta Subsea 1
#82 Donaldson Company 1
#83 Ecole Polytechnique Federale De Lausanne (Epfl) 1
#84 Entro Industries 1
#85 Fundacion Tecnalia Research & Innovation 1
#86 Geopier Foundation Company 1
#87 G&G Technology Co. 1
#88 Great Plains Manufacturing 1
#89 Gregory Enterprises 1
#90 Halenhardy 1
#91 Hitachi Zosen 1
#92 Honda Motor Co. 1
#93 Ihc Holland Ie B.V. 1
#94 Independence Materials Group 1
#95 Infiltrator Water Technologies 1
#96 Ingios Geotechnics 1
#97 Itrec B.V. 1
#98 Jiangsu University Of Science And Technology 1
#99 J&P Invesco 1
#100 Junttan Oy 1