Topic leaderboard
Rotary-piston or oscillating-piston machines
Ranked by the PatentIndex Score — a 1–99 percentile within F01C · public-visibility date · generated 2026
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest F01C patents became public in the last 2 years — the current frontier
- 199James Brent Klassen19 patents · 303 citations
- 296Kazuya Sato23 patents · 300 citations
- 392Isao Hayase11 patents · 113 citations
- 488Bruno Villeneuve31 patents · 129 citations
- 583Norman Ian Mathers10 patents · 79 citations
- 679Sebastien Bolduc25 patents · 116 citations
- 775David Gagnon-Martin30 patents · 121 citations
- 871Kirill M. Ignatiev21 patents · 73 citations
- 967Stephane Berube13 patents · 40 citations
- 1063Richard Paul Hayes-Pankhurst8 patents · 42 citations
- 1158William Anderson11 patents · 40 citations
- 1254Makoto Takeuchi17 patents · 46 citations
- 1350Jean-Gabriel Gauvreau12 patents · 34 citations
- 1446Robert C. Stover8 patents · 43 citations
- 1542Johnny Vinski11 patents · 37 citations
- 1638Peter Thomas Cariveau13 patents · 36 citations
- 1733William Lukaczyk9 patents · 33 citations
- 1829Jonathan Edward Ford5 patents · 30 citations
- 1925Nigel Paul Schofield9 patents · 26 citations
- 2021Kangwook Lee15 patents · 23 citations
- 2117Matthew T. Riley6 patents · 14 citations
- 2213Alan Ernest Kinnaird Holbrook12 patents · 19 citations
- 238Riccardo Meldolesi5 patents · 17 citations
- 244Jing Lu9 patents · 12 citations
- 251Timothy Mark Miller9 patents · 12 citations
Active· last 5 yrs
Sustained F01C output across the last 5 years
- 199Roy J. Doepker13 patents · 874 citations
- 296Masao Akei7 patents · 183 citations
- 392James Brent Klassen19 patents · 303 citations
- 488Kazuya Sato23 patents · 300 citations
- 583Jean Thomassin69 patents · 377 citations
- 679Merton W. Pekrul19 patents · 287 citations
- 775Takashi Sato19 patents · 142 citations
- 871Ronald J. Forni11 patents · 154 citations
- 967Ronald J. Duppert13 patents · 112 citations
- 1063Keith J. Reinhart6 patents · 117 citations
- 1158Isao Hayase11 patents · 113 citations
- 1254Clive Tucker8 patents · 86 citations
- 1350Johannes Schneider8 patents · 86 citations
- 1446Zackary Martin Anderson8 patents · 86 citations
- 1542Evan Moen7 patents · 82 citations
- 1638Ross J. Wendell7 patents · 82 citations
- 1733Sean C. Morton7 patents · 82 citations
- 1829Zachary John Jackowski7 patents · 82 citations
- 1925Bruno Villeneuve31 patents · 129 citations
- 2021Bryce R. Shaffer10 patents · 99 citations
- 2117Norman Ian Mathers10 patents · 79 citations
- 2213Greg John Montie10 patents · 48 citations
- 238Sebastien Bolduc25 patents · 116 citations
- 244David Gagnon-Martin30 patents · 121 citations
- 251Edwin Schulz23 patents · 81 citations
All-time canon
Career PatentIndex Score in F01C
- 199Danielle A. Fong19 patents · 722 citations
- 296Edwin P. Berlin, Jr.19 patents · 722 citations
- 392Kartikeya Mahalatkar19 patents · 722 citations
- 488Stephen E. Crane19 patents · 722 citations
- 583Todd Bowers19 patents · 722 citations
- 679Yongxi Hou19 patents · 722 citations
- 775Amirhossein Pourmousa Abkenar12 patents · 660 citations
- 871Karl E. Stahlkopf16 patents · 603 citations
- 967Jean-Luc M. Caillat28 patents · 2,202 citations
- 1063James W. Bush42 patents · 1,422 citations
- 1158Roger C. Weatherston14 patents · 1,003 citations
- 1254James F. Fogt8 patents · 1,015 citations
- 1350Roy J. Doepker13 patents · 874 citations
- 1446Mark Bass7 patents · 849 citations
- 1542John E. Mccullough20 patents · 1,327 citations
- 1638Robert W. Shaffer17 patents · 847 citations
- 1733David Boyle5 patents · 468 citations
- 1829Douglas F. Devries5 patents · 468 citations
- 1925Malcolm Williams5 patents · 468 citations
- 2021Michael Holmes5 patents · 468 citations
- 2117Gary J. Anderson11 patents · 602 citations
- 2213Yukio Horikoshi25 patents · 502 citations
- 238Hiroshi Sakamaki31 patents · 592 citations
- 244Takeshi Jinnouchi14 patents · 295 citations
- 251Kenji Tanzawa14 patents · 290 citations
Rising· last 2 yrs
The top-scoring F01C patents made public in the last 2 years
- 199US12104550B1✦ AIRotary engine with side housing having a side plate with a ceramic matrix composite core2 cites · 202476% earned
- 296US12292050B1✦ AIVacuum pump to generate a negative pressure2 cites · 202576% earned
- 392US11952899B1✦ AIBidirectional rotary hydraulic motor and pump3 cites · 202467% earned
- 488US12098641B2Rotational engine with inner and outer rings2 cites · 202461% earned
- 583US12123370B2Rotary engine shim design for floating side plates2 cites · 202476% earned
- 679US12110796B1Seal assembly for a rotary engine housing2 cites · 202476% earned
- 775US11905836B1Rotary engine with single dual-fuel injector2 cites · 202476% earned
- 871US11879457B1Electric compressor with isolation constraint system2 cites · 202467% earned
- 967US12297738B1Rotary engine and cooling systems thereof1 cites · 202567% earned
- 1063US11994130B2Electric compressor bearing oil communication aperture2 cites · 202476% earned
- 1158US12158101B1Internal continuous combustion rotary engine1 cites · 202467% earned
- 1254US12270398B1Compressor assemblies including lower covers having mounting feet skirts configured for in1 cites · 202567% earned
- 1350US11970967B1Rotary engine1 cites · 202446% earned
- 1446US12305640B2Particle adjusting drilling assembly and method1 cites · 202456% earned
- 1542US11891948B1Moving wall positive displacement turbine system1 cites · 202467% earned
- 1638US12203474B2Pump with a deformable diaphragm1 cites · 202456% earned
- 1733US12123414B2Rotary compressor1 cites · 202467% earned
- 1829US12140033B2Valve position control0 cites · 20240% earned
- 1925US12486771B2Rotor tilt compensation in PDM stators0 cites · 20240% earned
- 2021US12352266B2Rotor pair for a compression block of a screw machine0 cites · 20240% earned
- 2117US12460640B2Complex screw rotors with a central circular cross section connecting right-hand and left-0 cites · 20240% earned
- 2213US11959477B1Bearing and unloader assembly for compressors0 cites · 20240% earned
- 238US12196162B1System and method of hydrogen fuel injection0 cites · 20250% earned
- 244US12152598B2High pressure gas sealing0 cites · 20240% earned
- 251US12338821B1Micro-volume dispense pump systems and methods0 cites · 20250% earned
Active· last 5 yrs
The top-scoring F01C patents of the last 5 years
- 199US11333068B1✦ AISide wall for rotary engine housing13 cites · 202288% earned
- 296US11761376B1✦ AISide plate for rotary engine9 cites · 202387% earned
- 392US11635075B1✦ AIGerotor pump with bearing4 cites · 202382% earned
- 488US12104550B1Rotary engine with side housing having a side plate with a ceramic matrix composite core2 cites · 202476% earned
- 583USD973722SRotary positive displacement pump5 cites · 202284% earned
- 679US11506207B1Portable, rotary vane vacuum pump with a quick oil change system4 cites · 202282% earned
- 775US12292050B1Vacuum pump to generate a negative pressure2 cites · 202576% earned
- 871US11549507B2Hypotrochoid positive-displacement machine5 cites · 202284% earned
- 967US11746656B1Micro-volume dispense pump systems and methods5 cites · 202377% earned
- 1063US11619133B2Rotational engine with inner and outer rings4 cites · 202270% earned
- 1158US11788541B2High pressure gas sealing4 cites · 202170% earned
- 1254US11624366B1Co-rotating scroll compressor having first and second Oldham couplings4 cites · 202375% earned
- 1350US11486392B2Screw spindle pump having a stop surface axially adjacent to an end surface of a running s4 cites · 202282% earned
- 1446US11952899B1Bidirectional rotary hydraulic motor and pump3 cites · 202467% earned
- 1542US11486251B2Turbine speed detection and use4 cites · 202162% earned
- 1638US12110888B2Complex screw rotors having multiple helical profiles joined by a centeral portion with a 2 cites · 202358% earned
- 1733US11384684B2Rotary engine, parts thereof, and methods4 cites · 202175% earned
- 1829US12123370B2Rotary engine shim design for floating side plates2 cites · 202476% earned
- 1925US12110796B1Seal assembly for a rotary engine housing2 cites · 202476% earned
- 2021US11905836B1Rotary engine with single dual-fuel injector2 cites · 202476% earned
- 2117US11994127B2Multistage compression system4 cites · 202182% earned
- 2213US11499550B2Sealing in helical trochoidal rotary machines3 cites · 202157% earned
- 238US11808153B2Positive displacement motor stators with diameter reliefs compensating for rotor tilt2 cites · 202358% earned
- 244US11680520B1Rotary engine2 cites · 202358% earned
- 251US11879457B1Electric compressor with isolation constraint system2 cites · 202467% earned
All-time canon
The defining F01C patents of the whole record
- 199US4877382A✦ AIScroll-type machine with axially compliant mounting345 cites · 198988% earned
- 296US7188621B2✦ AIPortable ventilator system336 cites · 200587% earned
- 392US6213731B1✦ AICompressor pulse width modulation264 cites · 200191% earned
- 488US5613841ACapacity modulated scroll machine212 cites · 199794% earned
- 583US5102316ANon-orbiting scroll mounting arrangements for a scroll machine203 cites · 199294% earned
- 679US5320506AOldham coupling for scroll compressor203 cites · 199494% earned
- 775US5171138AComposite stator construction for downhole drilling motors183 cites · 199294% earned
- 871US4767293AScroll-type machine with axially compliant mounting175 cites · 198894% earned
- 967US5947710ARotary compressor with reduced lubrication sensitivity171 cites · 199990% earned
- 1063US6216691B1Mounting body164 cites · 200194% earned
- 1158US5121607AEnergy recovery system for large motor vehicles162 cites · 199294% earned
- 1254US4065279AScroll-type apparatus with hydrodynamic thrust bearing159 cites · 197794% earned
- 1350US7753036B2Compound cycle rotary engine149 cites · 200994% earned
- 1446US5431551ARotary positive displacement device146 cites · 199594% earned
- 1542US5611674ACapacity modulated scroll machine145 cites · 199793% earned
- 1638US8523547B2Rotary engine expansion chamber apparatus and method of operation therefor141 cites · 201193% earned
- 1733US5839270ASliding-blade rotary air-heat engine with isothermal compression of air132 cites · 199893% earned
- 1829US5640854AScroll machine having liquid injection controlled by internal valve128 cites · 199793% earned
- 1925US3994636AAxial compliance means with radial sealing for scroll-type apparatus127 cites · 197693% earned
- 2021US7207187B2Inverter-integrated motor for an automotive vehicle126 cites · 200387% earned
- 2117US6093000AMolten metal pump with monolithic rotor121 cites · 200090% earned
- 2213US4609334AScroll-type machine with rotation controlling means and specific wrap shape118 cites · 198693% earned
- 238US6398525B1Monolithic rotor and rigid coupling116 cites · 200290% earned
- 244US5522356AMethod and apparatus for transferring heat energy from engine housing to expansion fluid e116 cites · 199693% earned
- 251US5272285ASound attenuating machinery cover114 cites · 199393% earned
Rising· last 2 yrs
Assignees whose newest F01C patents became public in the last 2 years — the current frontier
- 199SANDEN CORP78 patents · 1,435 citations
- 296DAIKIN IND LTD52 patents · 339 citations
- 392PRATT & WHITNEY CANADA122 patents · 432 citations
- 488TOYOTA JIDOSHOKKI KK40 patents · 149 citations
- 583SAMSUNG ELECTRONICS CO LTD14 patents · 101 citations
- 679LG ELECTRONICS INC131 patents · 197 citations
- 775QUANTEX PATENTS LTD7 patents · 36 citations
- 871LUMENIUM LLC10 patents · 33 citations
- 967ATLAS COPCO AIRPOWER NV24 patents · 31 citations
- 1063EDWARDS LTD16 patents · 27 citations
- 1158HAMILTON SUNDSTRAND CORP25 patents · 34 citations
- 1254PANASONIC IP MAN CO LTD12 patents · 48 citations
- 1350HITACHI INDUSTRY EQUIPMENT SYSTEMS CO LTD27 patents · 20 citations
- 1446HANON SYSTEMS16 patents · 19 citations
- 1542ASTRON AEROSPACE LLC6 patents · 14 citations
- 1638SHW AUTOMOTIVE GMBH19 patents · 17 citations
- 1733TRANE INT INC20 patents · 13 citations
- 1829MATHERS HYDRAULICS TECH PTY LTD6 patents · 19 citations
- 1925ABACO DRILLING TECH LLC6 patents · 7 citations
- 2021ABB SCHWEIZ AG6 patents · 4 citations
- 2117BARON RICHARD4 patents · 5 citations
- 2213NETZSCH PUMPEN & SYSTEME GMBH6 patents · 7 citations
- 238MAHLE INT GMBH11 patents · 6 citations
- 244BUCHANAN WILLIAM GREGORY6 patents · 20 citations
- 251KAESER KOMPRESSOREN SE4 patents · 4 citations
Active· last 5 yrs
Sustained F01C output across the last 5 years
- 199CARRIER CORP44 patents · 976 citations
- 296EAGLE IND CO LTD21 patents · 329 citations
- 392EMERSON CLIMATE TECHNOLOGIES52 patents · 548 citations
- 488AIR SQUARED INC16 patents · 365 citations
- 583MITSUBISHI ELECTRIC CORP49 patents · 928 citations
- 679SANDEN CORP78 patents · 1,435 citations
- 775DENSO CORP25 patents · 331 citations
- 871DAIKIN IND LTD52 patents · 339 citations
- 967PRATT & WHITNEY CANADA122 patents · 432 citations
- 1063PEKRUL MERTON W17 patents · 240 citations
- 1158PARKER HANNIFIN CORP8 patents · 175 citations
- 1254MITSUBISHI HEAVY IND LTD29 patents · 239 citations
- 1350TOYOTA JIDOSHOKKI KK40 patents · 149 citations
- 1446TOYOTA MOTOR CO LTD18 patents · 134 citations
- 1542SAMSUNG ELECTRONICS CO LTD14 patents · 101 citations
- 1638LG ELECTRONICS INC131 patents · 197 citations
- 1733DEERE & CO12 patents · 88 citations
- 1829ROTOLIPTIC TECH INCORPORATED9 patents · 36 citations
- 1925TOSHIBA CARRIER CORP11 patents · 61 citations
- 2021REGI U S INC8 patents · 71 citations
- 2117QUANTEX PATENTS LTD7 patents · 36 citations
- 2213BORGWARNER INC4 patents · 85 citations
- 238LUMENIUM LLC10 patents · 33 citations
- 244WOODWARD INC6 patents · 34 citations
- 251EXPONENTIAL TECH INC5 patents · 17 citations
All-time canon
All-time PatentIndex Score in F01C
- 199FONG DANIELLE A12 patents · 660 citations
- 296COPELAND CORP49 patents · 3,178 citations
- 392LITTLE INC A27 patents · 1,627 citations
- 488CARRIER CORP44 patents · 976 citations
- 583EAGLE IND CO LTD21 patents · 329 citations
- 679HITACHI LTD87 patents · 2,108 citations
- 775TECUMSEH PRODUCTS CO27 patents · 600 citations
- 871EMERSON CLIMATE TECHNOLOGIES52 patents · 548 citations
- 967AIR SQUARED INC16 patents · 365 citations
- 1063MITSUBISHI ELECTRIC CORP49 patents · 928 citations
- 1158SANDEN CORP78 patents · 1,435 citations
- 1254INGERSOLL RAND CO43 patents · 759 citations
- 1350MATSUSHITA ELECTRIC INDUSTRIAL CO LTD43 patents · 695 citations
- 1446SANYO ELECTRIC CO54 patents · 660 citations
- 1542FORD MOTOR CO16 patents · 338 citations
- 1638GEN MOTORS CORP30 patents · 467 citations
- 1733AMERICAN STANDARD INC8 patents · 282 citations
- 1829DENSO CORP25 patents · 331 citations
- 1925TEXAS A & M UNIV SYS7 patents · 215 citations
- 2021CURTISS WRIGHT CORP24 patents · 468 citations
- 2117KALTENBACH & VOIGT8 patents · 259 citations
- 2213TOSHIBA KK19 patents · 354 citations
- 238DAIKIN IND LTD52 patents · 339 citations
- 244PRATT & WHITNEY CANADA122 patents · 432 citations
- 251NIPPON PISTON RING CO LTD26 patents · 461 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth