Topic leaderboard
Machines or engines of positive-displacement
Ranked by the PatentIndex Score — a 1–99 percentile within F01B · public-visibility date · generated 2026
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest F01B patents became public in the last 2 years — the current frontier
- 199Peter Augustinus Johannes Achten10 patents · 170 citations
- 296Fabien G. Redon34 patents · 168 citations
- 392Kelcy Jake Foster6 patents · 113 citations
- 488Matt Svrcek16 patents · 55 citations
- 583Matthew Roelle9 patents · 64 citations
- 679Christopher Gadda8 patents · 62 citations
- 775Adam Simpson10 patents · 40 citations
- 871Shannon Miller10 patents · 40 citations
- 967John J. Koszewnik7 patents · 17 citations
- 1063John Lawler6 patents · 15 citations
- 1158Harry Schoell4 patents · 31 citations
- 1254Frank Obrist6 patents · 11 citations
- 1350Daniel M. Schum4 patents · 9 citations
- 1446Scott Coakley4 patents · 12 citations
- 1542Cameron Wylie3 patents · 11 citations
- 1638David Degraaff3 patents · 11 citations
- 1733John Powers3 patents · 11 citations
- 1829Jodie Prudhomme3 patents · 11 citations
- 1925Kevin Walters3 patents · 11 citations
- 2021Sam Sherman3 patents · 11 citations
- 2117Ahmad Ghazi3 patents · 8 citations
- 2213Samrat M. Patil3 patents · 8 citations
- 238Curren Emmett Krasnoff3 patents · 6 citations
- 244Andrew P. Perr4 patents · 3 citations
- 251Gary A. Vrsek3 patents · 3 citations
Active· last 5 yrs
Sustained F01B output across the last 5 years
- 199Cyril Negre15 patents · 287 citations
- 296Peter Augustinus Johannes Achten10 patents · 170 citations
- 392Fabien G. Redon34 patents · 168 citations
- 488Kelcy Jake Foster6 patents · 113 citations
- 583Matt Svrcek16 patents · 55 citations
- 679Matthew Roelle9 patents · 64 citations
- 775Christopher Gadda8 patents · 62 citations
- 871Adam Simpson10 patents · 40 citations
- 967Shannon Miller10 patents · 40 citations
- 1063Christopher C. Langenfeld7 patents · 52 citations
- 1158Stanley B. Smith, Iii6 patents · 52 citations
- 1254Ryan G. Mackenzie14 patents · 56 citations
- 1350Shaul Haim Yaakoby19 patents · 13 citations
- 1446David W. Raymond5 patents · 41 citations
- 1542Marvin W. Ward5 patents · 11 citations
- 1638Leslie Wise6 patents · 15 citations
- 1733Milton Anderson6 patents · 15 citations
- 1829Xiaonan Zhai6 patents · 15 citations
- 1925Jianke Wang5 patents · 15 citations
- 2021John J. Koszewnik7 patents · 17 citations
- 2117Nathan W. Bonny6 patents · 32 citations
- 2213James C. Warren11 patents · 21 citations
- 238Nicholas A. Sanders6 patents · 16 citations
- 244John Lawler6 patents · 15 citations
- 251Dean Kamen4 patents · 15 citations
All-time canon
Career PatentIndex Score in F01B
- 199Danielle A. Fong25 patents · 914 citations
- 296Edwin P. Berlin, Jr.25 patents · 914 citations
- 392Stephen E. Crane25 patents · 914 citations
- 488Amirhossein Pourmousa Abkenar16 patents · 828 citations
- 583Kartikeya Mahalatkar19 patents · 722 citations
- 679Todd Bowers19 patents · 722 citations
- 775Yongxi Hou19 patents · 722 citations
- 871Karl E. Stahlkopf21 patents · 785 citations
- 967Alois Wolfsgruber8 patents · 229 citations
- 1063Rudolf Tscherne7 patents · 203 citations
- 1158Norbert Korenjak8 patents · 280 citations
- 1254Robert A. Sanderson14 patents · 343 citations
- 1350Albert E. Sanderson10 patents · 301 citations
- 1446Ana Paul7 patents · 381 citations
- 1542Marius A. Paul7 patents · 381 citations
- 1638John Zajac18 patents · 158 citations
- 1733David F. Moyer5 patents · 296 citations
- 1829Douglas C. Brackett17 patents · 410 citations
- 1925Constant V. David9 patents · 376 citations
- 2021Alvin Lowi, Jr.6 patents · 237 citations
- 2117Cyril Negre15 patents · 287 citations
- 2213Guy Negre14 patents · 287 citations
- 238Ian F. Smith6 patents · 91 citations
- 244Kay Herbert5 patents · 148 citations
- 251Monti Farrell5 patents · 129 citations
Rising· last 2 yrs
The top-scoring F01B patents made public in the last 2 years
- 199US11994121B1✦ AIPiston in piston variable displacement hydraulic device5 cites · 202477% earned
- 296US12098641B2✦ AIRotational engine with inner and outer rings2 cites · 202461% earned
- 392US11982186B1✦ AIVapor powered electro-mechanical generator2 cites · 202476% earned
- 488US12113427B2Linear electric generator2 cites · 202476% earned
- 583US12170501B2Core synchronization for linear generators2 cites · 202467% earned
- 679US12097980B1Engine device for unmanned flying apparatus1 cites · 202467% earned
- 775US12421890B2High-efficiency linear generator0 cites · 20240% earned
- 871US12385397B2Modular gland arrangements for a fluid end assembly0 cites · 20240% earned
- 967US12209548B2Control of piston trajectory in a linear generator0 cites · 20240% earned
- 1063US12027956B2Integrated linear generator system0 cites · 20240% earned
- 1158US12286940B2Parent bore cylinder block of an opposed-piston engine0 cites · 20240% earned
- 1254US12055111B2Exhaust catalyst light-off in an opposed-piston engine0 cites · 20240% earned
- 1350US12097397B2Aerobic exercise training apparatus0 cites · 20240% earned
- 1446US12398737B2Electro-fluidic remote drive0 cites · 20240% earned
- 1542US12515145B2Dirty water distillation and salt harvesting system, method, and apparatus0 cites · 20240% earned
- 1638US12146511B2Controlling multiple eversion-based actuators0 cites · 20240% earned
- 1733US12091978B1Power system with carbon dioxide working fluid, generator, and propulsion system0 cites · 20240% earned
- 1829US12180837B1Composite actuator systems and methods of making the same0 cites · 20240% earned
- 1925US12139246B2Method of operating an internal combustion engine of a watercraft0 cites · 20240% earned
- 2021US12421891B1High-speed long-stroke reciprocating engine0 cites · 20250% earned
- 2117US11988135B2Cleaner, more efficient engines0 cites · 20240% earned
- 2213US12065984B2Biomass energy generator system0 cites · 20240% earned
- 238US12553410B2Hydraulic device0 cites · 20250% earned
- 244US12435711B2Integrated electro-hydraulic unit housing0 cites · 20250% earned
- 251US12366232B2Hydraulic device0 cites · 20240% earned
Active· last 5 yrs
The top-scoring F01B patents of the last 5 years
- 199US10968700B1✦ AIBall transfer mechanism with polycrystalline diamond bearing support25 cites · 202186% earned
- 296US11994121B1✦ AIPiston in piston variable displacement hydraulic device5 cites · 202477% earned
- 392US11815042B2✦ AIExhaust catalyst light-off in an opposed-piston engine6 cites · 202274% earned
- 488US11441424B2Modular gland arrangements for a fluid end assembly7 cites · 202165% earned
- 583US11131255B1Piston engine cylinder head with combined functions6 cites · 202185% earned
- 679US11421586B2Six-cylinder opposed free piston internal combustion engine generator5 cites · 202284% earned
- 775US10927755B1Internal combustion engine with variable compression ratio and variable engine displacemen6 cites · 202185% earned
- 871US11053876B2Control of piston trajectory in a linear generator5 cites · 202162% earned
- 967US11092146B2Pump with symmetrical mounting holes for asymmetrical mounting arrangement5 cites · 202177% earned
- 1063US11136916B1Direct torque control, piston engine5 cites · 202184% earned
- 1158US11312258B2Electric generator motor system5 cites · 202284% earned
- 1254US11619133B2Rotational engine with inner and outer rings4 cites · 202270% earned
- 1350US11162480B2Variable stroke pump5 cites · 202177% earned
- 1446US11067069B2Tilt linkage for variable stroke pump3 cites · 202163% earned
- 1542US10975697B2Systems and methods for a piston engine including a recirculating system using supercritic3 cites · 202172% earned
- 1638US11982186B1Vapor powered electro-mechanical generator2 cites · 202476% earned
- 1733US12113427B2Linear electric generator2 cites · 202476% earned
- 1829US11131192B2Cylinder actuator3 cites · 202180% earned
- 1925US11193431B2System, apparatus and method for clean, multi-energy generation2 cites · 202153% earned
- 2021US12170501B2Core synchronization for linear generators2 cites · 202467% earned
- 2117US11473654B2Reciprocating engine with extended minimum combustion chamber volume2 cites · 202276% earned
- 2213US11831225B2Free piston generator based on rigid synchronous transmission system2 cites · 202276% earned
- 238US11421588B2Variable compression ratio engine2 cites · 202176% earned
- 244US11525391B2High-efficiency linear generator2 cites · 202148% earned
- 251US12078123B2Stirling cycle machine1 cites · 202342% earned
All-time canon
The defining F01B patents of the whole record
- 199US5491969A✦ AIPower plant utilizing compressed air energy storage and saturation475 cites · 199692% earned
- 296US9909492B2✦ AIOpposed piston internal combustion engine with inviscid layer sealing465 cites · 201495% earned
- 392US4740711A✦ AIPipeline built-in electric power generating set251 cites · 198894% earned
- 488US6230496B1Energy management system for hybrid electric vehicles243 cites · 200194% earned
- 583US6223846B1Vehicle operating method and system234 cites · 200191% earned
- 679US5762480AReciprocating machine216 cites · 199894% earned
- 775US4992669AModular energy system196 cites · 199194% earned
- 871US6675579B1HCCI engine intake/exhaust systems for fast inlet temperature and pressure control with in190 cites · 200494% earned
- 967US6279550B1Internal combustion engine171 cites · 200194% earned
- 1063US4672813AExternal combustion slidable vane motor with air cushions163 cites · 198794% earned
- 1158US5379589APower plant utilizing compressed air energy storage and saturation149 cites · 199590% earned
- 1254US5362219AInternal combustion engine with compound air compression143 cites · 199493% earned
- 1350US4776171ASelf-contained renewable energy system134 cites · 198893% earned
- 1446US5975052AFuel efficient valve control131 cites · 199993% earned
- 1542US8436489B2Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange125 cites · 201183% earned
- 1638US6439103B1Hydraulic and pneumatic cylinder construction125 cites · 200293% earned
- 1733US4651525APiston reciprocating compressed air engine122 cites · 198793% earned
- 1829US5326231AGas compressor construction and assembly122 cites · 199493% earned
- 1925US7005273B2Method for the determination of glycated hemoglobin120 cites · 200287% earned
- 2021US6332393B1Pump119 cites · 200186% earned
- 2117US6951211B2Cold air super-charged internal combustion engine, working cycle and method113 cites · 200493% earned
- 2213US8480529B2Continuously variable transmission108 cites · 200985% earned
- 238US4459945ACam controlled reciprocating piston device108 cites · 198493% earned
- 244US8065874B2Compressed air energy storage system utilizing two-phase flow to facilitate heat exchange102 cites · 201175% earned
- 251US4270495AVariable displacement piston engine102 cites · 198193% earned
Rising· last 2 yrs
Assignees whose newest F01B patents became public in the last 2 years — the current frontier
- 199CATERPILLAR INC23 patents · 414 citations
- 296KERR MACHINE CO6 patents · 113 citations
- 392BOSCH GMBH ROBERT30 patents · 141 citations
- 488ACHATES POWER INC69 patents · 180 citations
- 583MAINSPRING ENERGY INC14 patents · 26 citations
- 679INNAS BV6 patents · 39 citations
- 775UNIV MINNESOTA5 patents · 24 citations
- 871PHD INC4 patents · 47 citations
- 967OBRIST TECH GMBH6 patents · 11 citations
- 1063DUPLICENT LLC3 patents · 6 citations
- 1158DANFOSS POWER SOLUTIONS GMBH & CO OHG5 patents · 6 citations
- 1254FREEMAN WALTER B2 patents · 7 citations
- 1350SCHOELL HARRY2 patents · 12 citations
- 1446MCCANN DAVID2 patents · 5 citations
- 1542TONAND INC1 patents · 5 citations
- 1638DANA MOTION SYS ITALIA SRL7 patents · 0 citations
- 1733YAFA INNOVATIONS LTD1 patents · 2 citations
- 1829ARASE AIZAWA AEROSPATIALE LLC1 patents · 1 citations
- 1925GOODRICH CORP3 patents · 0 citations
- 2021FERRARI SPA2 patents · 0 citations
- 2117HOLLAND RONALD A2 patents · 0 citations
- 2213BAKER JR KENNETH C1 patents · 0 citations
- 238BAKER JR KENNETH COLIN1 patents · 0 citations
- 244ELECTRONICS FOR IMAGING INC1 patents · 0 citations
- 251HEAT IP HOLDCO LLC1 patents · 0 citations
Active· last 5 yrs
Sustained F01B output across the last 5 years
- 199CATERPILLAR INC23 patents · 414 citations
- 296KERR MACHINE CO6 patents · 113 citations
- 392BOSCH GMBH ROBERT30 patents · 141 citations
- 488ACHATES POWER INC69 patents · 180 citations
- 583DANFOSS AS9 patents · 74 citations
- 679MAINSPRING ENERGY INC14 patents · 26 citations
- 775ILLINOIS TOOL WORKS8 patents · 46 citations
- 871INNAS BV6 patents · 39 citations
- 967DEERE & CO7 patents · 42 citations
- 1063NEW POWER CONCEPTS LLC6 patents · 41 citations
- 1158NISSAN MOTOR5 patents · 68 citations
- 1254AQUARIUS ENGINES A M LTD16 patents · 9 citations
- 1350WARD MARVIN W5 patents · 11 citations
- 1446CW HOLDINGS LTD6 patents · 15 citations
- 1542GEN ELECTRIC10 patents · 38 citations
- 1638NAT TECH & ENG SOLUTIONS SANDIA LLC4 patents · 37 citations
- 1733ENFIELD ENGINE COMPANY LLC5 patents · 15 citations
- 1829UNIV MINNESOTA5 patents · 24 citations
- 1925PHD INC4 patents · 47 citations
- 2021HTS LLC7 patents · 6 citations
- 2117HYDRO GEAR LP8 patents · 18 citations
- 2213OBRIST TECH GMBH6 patents · 11 citations
- 238HONEYWELL INT INC4 patents · 22 citations
- 244FNA GROUP INC5 patents · 9 citations
- 251HUNSTABLE FRED E4 patents · 6 citations
All-time canon
All-time PatentIndex Score in F01B
- 199FONG DANIELLE A12 patents · 660 citations
- 296BOMBARDIER ROTAX GMBH7 patents · 262 citations
- 392HYDRO GEAR LTD PARTNERSHIP13 patents · 394 citations
- 488SANDERSON R MAN INC12 patents · 323 citations
- 583GEN MOTORS CORP20 patents · 622 citations
- 679PAUL MARIUS A7 patents · 381 citations
- 775ZAJAC OPTIMUM OUTPUT MOTORS IN17 patents · 156 citations
- 871SUNPOWER INC14 patents · 390 citations
- 967DAVID CONSTANT V8 patents · 360 citations
- 1063KANZAKI KOKYUKOKI MFG CO LTD9 patents · 190 citations
- 1158CATERPILLAR INC23 patents · 414 citations
- 1254HONDA MOTOR CO LTD29 patents · 297 citations
- 1350PHILIPS CORP11 patents · 281 citations
- 1446LIGHTSAIL ENERGY INC11 patents · 113 citations
- 1542VADETEC CORP6 patents · 194 citations
- 1638SUNDSTRAND CORP17 patents · 318 citations
- 1733BRP ROTAX GMBH & CO KG5 patents · 149 citations
- 1829INGERSOLL RAND CO13 patents · 220 citations
- 1925LINDE AG13 patents · 240 citations
- 2021TOYOTA MOTOR CO LTD9 patents · 152 citations
- 2117CENTRIFUGAL PISTON EXPANDER11 patents · 157 citations
- 2213TECUMSEH PRODUCTS CO7 patents · 135 citations
- 238WELCH ALLYN INC4 patents · 209 citations
- 244GUL & CO DEV AB7 patents · 110 citations
- 251BRUENINGHAUS HYDROMATIK GMBH13 patents · 146 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth