List of prolific inventors
Worldwide utility patents
Inventors with 200 or more worldwide utility patents are shown in the following table. While in many cases this is the number of utility patents granted by the United States Patent and Trademark Office, it may include utility patents granted by other countries, as noted by the source references for an inventor.

List of prolific inventors

Section Title: Worldwide utility patents
Table Section Text: Inventors with 200 or more worldwide utility patents are shown in the following table. While in many cases this is the number of utility patents granted by the United States Patent and Trademark Office, it may include utility patents granted by other countries, as noted by the source references for an inventor.

Inventor	# of patents	Country	Active	Main fields of invention	Ref

Shunpei Yamazaki	5426	Japan	1976-2019	Thin film transistors, Liquid crystal displays, Solar cells, Flash memory, OLED

Kia Silverbrook	4747	Australia	1994-2018	Printing, Digital paper, Internet, Electronics, CGI, Chemical, DNA, Lab-on-a-chip, MEMS, Mechanical, VLSI

Lowell L. Wood, Jr.	1848	USA	1977-2019	Various

Roderick A. Hyde	1748	USA	2001-2019	Various

Kangguo Cheng	1741	USA	2004-2019	Semiconductor device fabrication, Semiconductor memory, Semiconductor device

Jun Koyama	1372	Japan	1991-2019	Thin film transistors, Liquid crystal displays, OLED

Gurtej Sandhu	1315	India	1991-2019	Thin film processes and materials, VLSI, Semiconductor device fabrication

Paul Lapstun	1288	Australia	2000-2018	Printing, Digital paper, Internet, Electronics, CGI, VLSI

Clarence T. Tegreene	1152	USA	2000-2019	Various

Leonard Forbes	1106	Canada	1991-2019	Semiconductor Memories, CCDs, Thin film processes and materials, VLSI

Thomas Edison	1084	USA	1847(b)-1931(d)	Electric power, Lighting, Batteries, Phonograph, Cement, Telegraphy, Mining

Edward K. Y. Jung	1052	USA	1996-2019	Various

Shou-Shan Fan	1012	China	2006-2019	Carbon nanotubes and their applications

Donald E. Weder	1000	USA	1976-2017	Florist supplies

George Albert Lyon	993	Canada	1882(b)-1961(d)	Automotive, Stainless steel products

Jay S. Walker	958	USA	1998-2019	Gaming machines

John F. O'Connor	949	USA	1864(b)-1938(d)	Railway draft gearing

Michael J. Sullivan	949	USA	1977-2019	Golf balls

Rick Allen Hamilton II	926	USA	1999-2019	Various

Melvin De Groote	925	USA	1895(b)-1963(d)	Chemical de-emulsifiers

Jordin T. Kare	896	USA	1992-2019	Various

Francis H. Richards	894	USA	1850(b)-19??(d)	Mechanical, automation

Ahmadreza Rofougaran	848	USA	2002-2019	Radio Frequency Integrated Circuits

Nathan Myhrvold	846	USA	1994-2019	Various

Mark Malamud	817	USA	1997-2019	Various

Robert W. Lord	805	USA	2003-2019	Various

Royce A. Levien	801	USA	1997-2019	Various

Muriel Y. Ishikawa	789	USA	2002-2019	Various

William H. Eby	780	USA	1994-2019	Transgenic soybeans

Warren Farnworth	772	USA	1990-2017	Semiconductor packaging

Salman Akram	757	USA	1995-2019	Semiconductor packaging

Carleton Ellis	753	USA	1876(b)-1941(d)	Margarine, Polyester, Anti-knock gasoline, Paint stripper

Jeyhan Karaoguz	747	USA	1996-2019	Wireless communications, Computer networks

Hideo Ando	729	Japan	1983-2017	Optical recording

George Spector	722	USA	1976-1998	Gadgets, Toys

Austin L. Gurney	714	USA	1999-2019	Proteins, Antibodies

Elihu Thomson	696	UK	1853(b)-1937(d)	Electric power, Arc lamp, Electric motors, Lightning arrester, Arc welder

Tetsujiro Kondo	695	Japan	1987-2018	Signal processing, Image processing

Ali Khakifirooz	695	USA	2011-2019	Integrated Circuits, CMOS, Semiconductor device fabrication

William I. Wood	653	USA	1981-2016	Proteins, Antibodies

Simon R. Walmsley	651	Australia	1995-2015	Printing, Electronics, VLSI, Cryptography

Bruce B. Doris	642	USA	1995-2019	Integrated Circuits, CMOS, DRAM, Semiconductor device fabrication

Audrey D. Goddard	625	USA	1997-2019	Proteins, Antibodies

John M. Santosuosso	624	USA	2001-2019	Various

Eric C. Leuthardt	610	USA	2006-2019	Medical devices

Edward J. Nowak	609	USA	1979-2019	Semiconductor device fabrication, Semiconductor memory, Semiconductor device

Jerome Lemelson	606	USA	1923(b)-1997(d)	Toys, Industrial robots, Cordless telephones, Fax machines, Videocassette recorders

Tadahiro Ohmi	597	Japan	1981-2018	Thin film processes and materials, Semiconductor device fabrication

Kie Y Ahn	596	USA	1976-2018	Thin film processes and materials, VLSI, Semiconductor device fabrication

Béla Barényi	595	Austria	1907(b)-1997(d)	Passive safety in automobiles

Paul J. Godowski	579	USA	1994-2014	Proteins, Antibodies

Artur Fischer	570	Germany	1976-2002	Fasteners, Construction toys

Devendra K. Sadana	570	India	1983-2019	Solar cells, OLED, Integrated Circuits, CMOS, DRAM, LEDs

Clifford A. Pickover	569	USA	1992-2019	Various

Louis L. Hsu	551	USA	1988-2016	Various

Chih-Chao Yang	548	USA	2003-2019	Integrated Circuits

Jeffrey P. Gambino	540	USA	1992-2019	MEMS, CMOS, BiCMOS, DRAM, Image Sensors, RF, Biosensors, 3D Integrated Circuits

Edwin H. Land	535	USA	1909(b)-1991(d)	Instant photography, Polarizing film

Victoria Y. H. Wood	532	USA	2009-2019	Various

Henri Dreyfus	524	Switzerland	1882(b)-1944(d)	Polymers, Synthetic fibers, Dyes

Clyde C. Farmer	513	USA	18??(b)-19??(d)	Railway air brakes

Heinz Focke	512	Germany	1976-2013	Cigarette packaging

Mark I. Gardner	511	USA	1994-2010	Consumer electronics, Energy, Computers, Semiconductors, Physics

Ravi K. Arimilli	508	India	1992-2019	Computer architecture, Semiconductor memory, Cache coherence, Symmetric multiprocessing

Anthony K. Stamper	506	USA	1998-2019	MEMS, CMOS, BiCMOS, Silicon-germanium

Louis H. Morin	503	USA	18??(b)-19??(d)	Fasteners, Locks, Bobbins

Ronald S. Cok	502	USA	1986-2019	OLED displays; image processing

Tobin A. King	501	Australia	2000-2018	Printing, Digital paper, Mechanical

Gregory J. Boss	491	USA	2008-2019	Various

Belgacem Haba	490	Algeria	1991-2019	Semiconductor manufacturing

Robert S. Langer	484	USA	1983-2019	Biotechnology, Drug delivery, Tissue engineering

James M. Hart	482	USA	1988-2019	Motor vehicle transmission

Jack A. Mandelman	481	USA	1987-2014	Various

Kai-Li Jiang	476	China	2006-2019	Carbon nanotubes and their applications

Akira Nakazawa	458	Australia	1980-2018	Printing, Mechanical

Eberhard Ammermann	451	Germany	1979-2015	Fungicides

Thomas E. Murray	449	USA	1860(b)-1929(d)	Electrical, HVAC, Wheels, Metal working, Light dimmer

Lisa Seacat DeLuca	449	USA	2009-2019	Various

Ruilong Xie	446	USA	2013-2019	Semiconductor device, CMOS, Semiconductor device fabrication

Hongyong Zhang	440	Japan	1993-2016	Thin film transistors, Liquid crystal displays

John L. Melanson	436	USA	1978-2019	Integrated circuits, semiconductors, mixed-signal products, signal processing, audio and voice components, hearing aids, LED lighting, and motor control

Scott H. Wittkopp	432	USA	2001-2017	Motor vehicle transmission

Brian M. O'Connell	426	USA	2009-2019	Various

Frederick A. Ware	423	USA	1981-2019	Chip design

John Hays Hammond, Jr.	417	USA	1888(b)-1965(d)	Radio control, Radio communications, Torpedoes

Hossein Eslambolchi	414	USA	1993-2018	Telecommunications, Network intelligence, information Technology, communications technology

Vincent J. Zimmer	412	USA	1999-2019	Computer software and firmware

Wilhelm Brandes	411	Germany	1976-2010	Fungicides

Cary L. Bates	411	USA	1994-2019	Programming tools, DBX, Memory debuggers

Xuemin (Sherman) Chen	410	USA	1997-2018	Computer networks, Integrated Circuits, Signal Processing

Stanford R. Ovshinsky	400	USA	1922(b)-2012(d)	Batteries, Solar cells, Liquid crystal displays, Hydrogen fuel cells, Computer data storage

Brent A. Anderson	395	USA	2001-2019	Semiconductor device fabrication, Semiconductor memory, Semiconductor device

Josef Theurer	388	Austria	1976-2016	Railroad maintenance machines

David V. Horak	387	USA	1992-2018	Various

Paul W. Dent	382	USA	1984-2019	Wireless communications

Sarbajit K. Rakshit	380	India	2013-2019	Various

George P. Liang	379	China	1983-2018	Gas turbine cooling

Wael W. Diab	378	USA	2003-2018	Computer networks

Hans-Joachim Santel	377	Germany	1986-2013	Herbicides, Pesticides, Organic chemistry

Gisela Lorenz	374	Germany	1990-2015	Fungicides, Organic chemistry

Garry R. Jackson	367	Australia	2001-2016	Printing, Mechanical

Pouya Hashemi	362	USA	2013-2019	Semiconductor, VLSI, CMOS logic and memory, cognitive

George Westinghouse	361	USA	1846(b)-1914(d)	Electric power, Electricity meter, Railway air brake, Steam engines

Jeffrey E. Stahmann	357	USA	1994-2019	Medical devices

William Daniel Hillis	357	USA	1986-2019	Various

Norman M. Berry	355	Australia	2006-2018	Printing, Mechanical

Mark W. Kroll	354	USA	1987-2019	Implantable medical devices

Robert R. Schmidt	350	Germany	1971-2005	Herbicides, Fungicides, Organic chemistry

Lawrence A. Clevenger	346	USA	1996-2019	Semiconductor, Cognitive, Memory, Security, Analytics

Carl J. Radens	342	USA	1994-2019	Integrated Circuits, CMOS, DRAM, Semiconductor device fabrication

Bengt Lindoff	336	Sweden	2000-2019	Wireless communications

Ajith K. Kumar	333	India	1984-2019	Electric Power, Energy Management, Rail Transportation, Mining

Esmael H. Dinan	327	USA	2006-2019	Communication networks

Keith R. Walker	326	Saudi Arabia	2003-2019	Various

Elizabeth A. Sweeney	326	USA	2010-2019	Various

Hanson S. Gifford III	325	USA	1986-2019	Medical devices

Dean L. Kamen	325	USA	1979-2019	Battery-powered electric vehicles, Medical devices, Stirling engines, Water purification, Wheelchairs

Daniel J. Winarski	315	USA	1982-2019	Various

Liang Liu	315	China	2005-2019	Carbon nanotubes and their applications

Timothy J. Slegel	315	USA	1993-2019	Computer architecture

Steven L. Teig	314	USA	1995-2018	Integrated Circuits

Philip D. Nguyen	311	USA	1992-2019	Oilfield

Frank J. Viola	310	USA	1981-2019	Surgical instruments, Medical devices

Victor S. Moore	310	USA	1982-2019	Various

Kulvir S. Bhogal	309	USA	2003-2019	Various

Victoria Smith	308	USA	2006-2017	Proteins, Antibodies

Robert G. LeTourneau	299	USA	1888(b)-1969(d)	Earthworks (engineering), Heavy Equipment, Industrial Machinery

Michael (S.) Tsirkin	299	Israel	2012-2019	Virtual Machines, I/O Data Processing, Computer Graphics, Power Management, Computer Memory, Computer Networks, Distributed Data Processing, Fault Recovery, Data Structures

William R. Tonti	291	USA	1994-2016	Integrated Circuits, CMOS, DRAM, Semiconductor device fabrication

Zine-Eddine Boutaghou	290	Algeria	1994-2018	Hard disk drive

Assaf Natanzon	290	Israel	2007-2019	Storage Systems, Data Protection

Adam Heller	284	Romania	1968-2019	Solar cells, Glucose meters, Lasers

Jeffrey W. Sleight	283	USA	1998-2019	Integrated Circuits, CMOS, Semiconductor device fabrication

Brent Keeth	279	USA	1994-2019	Integrated Circuits, CMOS, DRAM

Madhusudan K. Iyengar	277	India	2005-2019	Chip Cooling

Cyprian E. Uzoh	273	Nigeria	1998-2019	Semiconductor processing

Daniel C. Edelstein	273	USA	1991-2019	Semiconductor manufacturing

Michael A. Rothman	272	USA	2001-2019	Computer software and firmware

Hartley Owen	267	USA	1976-2010	Fluid catalytic cracking

Bran Ferren	259	USA	1986-2019	Computers, Consumer Electronics, Electro-Optical Systems, Medical, User Interfaces, Automotive, Vehicles & Transportation

Yoshihiro Kikuchi	257	Japan	1994-2018	Video processing

Christopher J. Dawson	256	USA	2006-2019	Various

Takeshi Chujoh	256	Japan	1995-2019	Video processing

Rajiv V. Joshi	255	USA	1986-2019	Electronics, analytics

Harry (Tom) Graef	254	USA	1976-2019	Business machines, automation

Craig E. Hampel	250	USA	1996-2019	Integrated Circuits

Dorin Comaniciu	248	USA	2003-2019	Machine Intelligence, Medical Imaging, Image-Guided Surgery, Computer Vision

Nobuyuki Taniguchi	245	Japan	1979-2015	Cameras

Sandeep R. Patil	244	India	2008-2019	Various

Johnny M. Shieh	242	USA	1996-2018	Various

Andrew J. Ouderkirk	242	USA	1989-2019	LEDs, Optic Films

Philip S. Yu	240	USA	1982-2018	Various

James E. Bostick	238	USA	1993-2019	Various

Imad Libbus	237	USA	2007-2019	Medical devices

Louis B. Rosenberg	232	USA	1995-2019	Augmented Reality, Virtual Reality, HCI

Gerald F. McBrearty	231	USA	1997-2018	Various

Zvi Or-Bach	230	USA	1982-2019	Various

Thomas J. Kennedy III	228	USA	1992-2018	Sporting Goods, Wind Turbines, Biotechnology

Mark A. Horowitz	226	USA	1993-2019	Integrated Circuits

Michael L. Fripp	226	USA	2004-2019	Oilfield

James R. Kraemer	224	USA	2008-2019	Various

Dureseti Chidambarrao	221	USA	1995-2017	Integrated Circuits, CMOS, Semiconductor device fabrication

Paul Ian Mackey	220	Australia	2008-2016	Printing, Mechanical

James W. Seaman	220	USA	2005-2019	Various

Seung H. Kang	216	USA	2002-2019	Semiconductor device technologies, MRAM, spintronics, and memory circuit design

Jonathan J. Hull	215	USA	1987-2019	Various

Stephen G. Perlman	213	USA	1989-2019	Wireless communications, Cloud gaming, Video compression

Mukta Ghate Farooq	213	India	1993-2019	Semiconductor materials and structures, packaging technology, and 3-dimensional silicon integration

Sebastian T. Ventrone	210	USA	1989-2019	Semiconductor, Logic, Architecture

Gregory McAvoy	208	Ireland	2003-2017	Printing, MEMS

Hiroshi (You) Yoshioka	205	Japan	1997-2015	Cameras

Patrick B. Usoro	205	USA	1999-2016	Motor vehicle transmission, Hybrid Powertrains, Vehicle Thermal Management

Rajarshi Gupta	205	India	2004-2019	Wireless networking, Machine Learning, Cybersecurity

Sadeg M. Faris	202	Libya	1979-2018	Various

Sentence(s)

Ronald S. Cok is a prolific inventor.

final_sentence: Ronald S. Cok is a prolific inventor.