Metal casting 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	Steven J. Bullied	54	RTX (Raytheon)
2	John Joseph Marcin	51	RTX (Raytheon)
3	Fritz-Peter Pleschiutschnigg	47	Mannesmann Ag
#4	Robert Bruce Wagstaff	46	Novelis
#5	Hans Streubel	39	Sms Schloemann-Siemag
#6	Rama Ballav Mahapatra	38	Nucor
#7	Alfredo Poloni	37	Danieli & C. Officine Meccaniche S.P.A.
#8	Minoru Hirata	37	Sintokogio
#9	Derek E. Tyler	36	Olin
#10	Walter Blejde	36	Nucor
#11	Bernard Patrick Bewlay	33	GE
#12	John C. Yarwood	33	Olin
#13	Qigui Wang	32	General Motors
#14	William A. Hunter	32	Hunter Automated Machinery
#15	Carl R. Verner	31	RTX (Raytheon)
#16	Werner Scheurecker	31	Voest-Alpine
#17	William Thomas Carter	31	GE
#18	Emanuel M. Sachs	30	Desktop Metal
#19	Gerald Hohenbichler	30	Voest-Alpine Industrieanlagenbau Gmbh &
#20	Hisahiko Fukase	30	Ishikawajima-Harima Heavy Industries Co.
#21	Joseph Stevick	30	Apple
#22	Raymond J. Donahue	30	Brunswick
#23	Iver E. Anderson	29	Iowa State University
#24	Raimund Bruckner	29	Didier-Werke Ag
#25	Walter A. Johnson	29	Gte Products
#26	Patrick D. King	28	Flo-Con Systems
#27	Srikanth Chandrudu Kottilingam	28	GE
#28	Christopher D. Prest	27	Apple
#29	Mario P. Bochiechio	27	RTX (Raytheon)
#30	Paul V. Cooper	27	Molten Metal Equipment Innovations
#31	Douglas Gerard Konitzer	26	GE
#32	Joseph C. Poole	26	Apple
#33	Theodore A. Waniuk	26	Apple
#34	Zhiyue Xu	26	—
#35	Steven A. Miller	25	H.C. Starck
#36	Axel Weyer	24	Sms Demag
#37	George D. Chandley	24	Hitchiner Manufacturing Co.
#38	Grant O. Cook, III	24	Halliburton Energy Services
#39	Gregory Terrence Garay	24	GE
#40	Hisashi Harada	24	Mitsubishi Electric
#41	Sergey Mironets	24	RTX (Raytheon)
#42	Terrance M. Cleary	24	Brunswick
#43	Tracy A. Propheter-Hinckley	24	RTX (Raytheon)
#44	Vladek Kasperchik	24	HP
#45	Xi Yang	24	GE
#46	Heiji Kato	23	Ishikawajima-Harima Heavy Industries Co.
#47	Jacques Barbe	23	Main Management Inspiration Ag
#48	Jan-Erik Eriksson	23	—
#49	Kenji Yamamoto	23	Sony
#50	Robert W. Ratte	23	Water Gremlin
#51	Ching-Pang Lee	22	GE
#52	Ernst Luhrsen	22	Didier-Werke Ag
#53	Jean-Charles Daussan	22	Daussan Et Compagnie
#54	Kenneth D. McKibben	22	Hayes Lemmerz International
#55	Nuredin Kapaj	22	Danieli & C. Officine Meccaniche S.P.A.
#56	Qingyou Han	22	Purdue Research Foundation
#57	Andre Daussan	21	—
#58	Arnold J. Cook	21	Pcc Composites
#59	Brian David Przeslawski	21	GE
#60	Changhai Li	21	Citic Dicastal Co.
#61	Gerard Daussan	21	Daussan Et Compagnie
#62	James T. Beals	21	RTX (Raytheon)
#63	Lawrence D. Graham	21	Pcc Airfoils
#64	Lazar Strezov	21	Nucor
#65	Mamoru Miyagawa	21	Nissei Plastic Industrial Co.
#66	Michael Francis Xavier Gigliotti	21	GE
#67	Norihiro Iwamoto	21	Toshiba Kikai
#68	Preston B. Kemp, Jr.	21	Gte Products
#69	Ranjan Ray	21	Marko Materials
#70	Scott P. Crafton	21	Consolidated Engineering Company
#71	Sean O'Keeffe	21	Apple
#72	Shiro Osada	21	Ishikawajima-Harima Heavy Industries Co.
#73	Tadashi Nishida	21	Sintokogio
#74	Akihisa Inoue	20	Unknown
#75	Andrea De Luca	20	Flusso Limited
#76	Dilip M. Shah	20	RTX (Raytheon)
#77	Gary L. Ungarean	20	Olin
#78	Howard H. Liebermann	20	—
#79	Ho Yu	20	Aluminum Company Of America
#80	Lawrence J. Heaslip	20	Vesuvius Crucible
#81	Ulrich Urlau	20	Mannesmann Ag
#82	Wilhelm F. Lauener	20	Larex, A.G.
#83	Yutaka Hadano	20	Sintokogio
#84	Anil K. Sachdev	19	General Motors
#85	Andrew Sherman	19	Terves
#86	James D. Dorricott	19	Vesuvius Crucible
#87	Keisuke Ban	19	Honda Motor Co.
#88	Richard Remo Fontana	19	Desktop Metal
#89	Werner Landua	19	Adolf Hottinger Maschinenbau Gmbh
#90	Guido Perrella	18	Dbm Industries
#91	JinQuan Xu	18	RTX (Raytheon)
#92	John H. Martin	18	Hrl Laboratories
#93	Karl-Heinz Spitzer	18	Mannesmann Ag
#94	Mark Gilbert Benz	18	GE
#95	Makhlouf Redjdal	18	6K
#96	Mohammed S. Shaarawi	18	HP
#97	Ryan C. Breneman	18	RTX (Raytheon)
#98	Sankaranarayanan Ashok	18	Olin
#99	Stephen Francis Rutkowski	18	GE
#100	Takayuki Komiyama	18	Sintokogio

Top Companies

Rank ↑	Company ↕	Patents ↕
1	GE	489
2	RTX (Raytheon)	389
3	General Motors	282
#4	Sintokogio	204
#5	Toyota	199
#6	Honda Motor Co.	171
#7	Nippon Steel	158
#8	Hitachi	139
#9	Unknown	136
#10	Rolls-Royce Plc	130
#11	Mannesmann Ag	116
#12	Ford	114
#13	Nucor	99
#14	Honeywell	98
#15	Danieli & C. Officine Meccaniche S.P.A.	95
#16	Didier-Werke Ag	94
#17	The Boeing	93
#18	Sumitomo Electric Industries	88
#19	Toshiba Kikai	86
#20	Olin	85
#21	Aluminum Company Of America	83
#22	Sms Schloemann-Siemag	81
#23	Kawasaki Steel	78
#24	Gte Products	76
#25	Foseco International Limited	75
#26	HP	72
#27	Siemens Aktiengesellschaft	70
#28	Vesuvius Crucible	70
#29	US Air Force	68
#30	Novelis	67
#31	Stopinc Aktiengesellschaft	66
#32	Ishikawajima-Harima Heavy Industries Co.	65
#33	Voest-Alpine	62
#34	Sms Demag	60
#35	Safran Aircraft Engines	58
#36	Voest-Alpine Industrieanlagenbau Gmbh &	57
#37	Xerox	57
#38	Mitsubishi Materials	56
#39	Hyundai Motor	55
#40	Brunswick	54
#41	E.I. Du Pont De Nemours And	54
#42	Seiko Epson	54
#43	Baker Hughes Holdings	53
#44	Howmet Research	50
#45	Refractory Intellectual Property	50
#46	Alcoa	49
#47	Desktop Metal	49
#48	Mitsubishi Electric	49
#49	Allied Consulting	48
#50	Georg Fischer	46
#51	Kobe Steel	46
#52	Bhp Steel (Jla) Pty.	45
#53	Jfe Steel	45
#54	Shinagawa Refractories Co.	45
#55	Pcc Airfoils	43
#56	Dowa Electronics Materials Co.	42
#57	Kobe Steel	42
#58	Sodick Co.	42
#59	Krosakiharima	41
#60	Sumitomo Metal Industries	41
#61	AMD	40
#62	Ashland	40
#63	Hazelett Strip-Casting	40
#64	Hamilton Sundstrand	39
#65	Mazda Motor	39
#66	Ube Industries	39
#67	Basf Se	38
#68	Cmi International	38
#69	Kennametal	38
#70	Apple	37
#71	Halliburton Energy Services	37
#72	Wagstaff	37
#73	Citic Dicastal Co.	36
#74	MIT	36
#75	Alcan International Limited	35
#76	Concast Ag	35
#77	Nippon Kokan Co.	35
#78	LG	35
#79	Iowa State University	34
#80	Sms Siemag Ag	34
#81	Swiss Aluminium	34
#82	Dansk Industri Syndikat A/S	33
#83	Ut-Battelle	33
#84	Hunter Automated Machinery	32
#85	Oskar Frech Gmbh + Co. Kg	32
#86	Smith International	32
#87	Snecma	32
#88	Southwire Company	32
#89	Sumitomo Metal Mining Co.	32
#90	Samsung	32
#91	Howmet	31
#92	Caterpillar	31
#93	CEA	30
#94	Ask Chemicals Gmbh	29
#95	Bethlehem Steel	29
#96	Flo-Con Systems	29
#97	Molten Metal Equipment Innovations	29
#98	Nissan Motor Co.	29
#99	Nissei Plastic Industrial Co.	29
#100	Outboard Marine	29

Metal casting Patent Leaders All Time

Patents per Year

Top Inventors

Top Companies