Topic leaderboard
Cyclically operating valves for machines
Ranked by the PatentIndex Score — a 1–99 percentile within F01L · public-visibility date · generated 2026
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest F01L patents became public in the last 2 years — the current frontier
- 199Austin Robert Zurface36 patents · 653 citations
- 296Robb Janak18 patents · 306 citations
- 392Zhou Yang31 patents · 594 citations
- 488Andrei Dan Radulescu34 patents · 285 citations
- 583Majo Cecur50 patents · 408 citations
- 679Louis J. Serrano13 patents · 188 citations
- 775Braman Wing18 patents · 248 citations
- 871James E. Mccarthy, Jr.58 patents · 224 citations
- 967Kiyoung Kwon55 patents · 281 citations
- 1063Kyoung Pyo Ha98 patents · 326 citations
- 1158You Sang Son72 patents · 223 citations
- 1254Back Sik Kim71 patents · 136 citations
- 1350Justin D. Baltrucki43 patents · 131 citations
- 1446Markus Hochmayr6 patents · 81 citations
- 1542Kevin B. Todd5 patents · 95 citations
- 1638Gabriel S. Roberts20 patents · 59 citations
- 1733G. Michael Gron, Jr.20 patents · 62 citations
- 1829John Jerl Purcell, Iii4 patents · 72 citations
- 1925Hisashi Ozeki18 patents · 54 citations
- 2021Fabiano Contarin7 patents · 51 citations
- 2117Luigi Lia9 patents · 32 citations
- 2213David M. Barnes12 patents · 34 citations
- 238Chad Mccloy29 patents · 25 citations
- 244Emanuele Raimondi26 patents · 19 citations
- 251Bruce A. Swanbon10 patents · 33 citations
Active· last 5 yrs
Sustained F01L output across the last 5 years
- 199Michael M. Schechter22 patents · 1,473 citations
- 296Timothy W. Kunz18 patents · 770 citations
- 392John A. Schwoerer23 patents · 524 citations
- 488Austin Robert Zurface36 patents · 653 citations
- 583Cong Yue Qiao23 patents · 543 citations
- 679David Gerard Genise15 patents · 270 citations
- 775Matthew A. Younkins18 patents · 244 citations
- 871Robb Janak18 patents · 306 citations
- 967Zhou Yang31 patents · 594 citations
- 1063Andrei Dan Radulescu34 patents · 285 citations
- 1158Brian Karl Vandeusen15 patents · 273 citations
- 1254Jeffrey Allen Doering16 patents · 282 citations
- 1350John Eric Rollinger43 patents · 333 citations
- 1446Douglas J. Nielsen36 patents · 283 citations
- 1542Majo Cecur50 patents · 408 citations
- 1638Oliver Schnell52 patents · 505 citations
- 1733Louis J. Serrano13 patents · 188 citations
- 1829James R. Sheren17 patents · 209 citations
- 1925Philip Michael Kline10 patents · 198 citations
- 2021Braman Wing18 patents · 248 citations
- 2117Peter Sailer49 patents · 311 citations
- 2213Yutaka Mabuchi15 patents · 186 citations
- 238Norbert Geyer29 patents · 270 citations
- 244David Doll13 patents · 159 citations
- 251James E. Mccarthy, Jr.58 patents · 224 citations
All-time canon
Career PatentIndex Score in F01L
- 199Jerome H. Lemelson12 patents · 1,306 citations
- 296Qibing Pei8 patents · 922 citations
- 392Michael M. Schechter22 patents · 1,473 citations
- 488Roy D. Kornbluh5 patents · 826 citations
- 583Ronald E. Pelrine5 patents · 826 citations
- 679Haoran Hu15 patents · 1,195 citations
- 775Roger P. Butterfield15 patents · 922 citations
- 871Bruno Lequesne8 patents · 630 citations
- 967Takuya Shiraishi19 patents · 863 citations
- 1063Oded Eddie Sturman23 patents · 1,056 citations
- 1158Toshiharu Nogi18 patents · 739 citations
- 1254Minoru Ohsuga18 patents · 786 citations
- 1350Toshihiro Yamaki13 patents · 1,277 citations
- 1446Franklin R. Smith41 patents · 1,172 citations
- 1542Zdenek S. Meistrick25 patents · 826 citations
- 1638Joseph M. Vorih14 patents · 851 citations
- 1733Nick J. Hendriksma46 patents · 1,239 citations
- 1829Thomas G. Leone18 patents · 724 citations
- 1925Hiroshi Sono13 patents · 615 citations
- 2021Mark J. Spath36 patents · 1,143 citations
- 2117William Francis Stockhausen14 patents · 778 citations
- 2213Richard Vanderpoel19 patents · 703 citations
- 238Kynan L. Church17 patents · 758 citations
- 244John D. Russell54 patents · 1,291 citations
- 251Mamoru Fujieda12 patents · 463 citations
Rising· last 2 yrs
The top-scoring F01L patents made public in the last 2 years
- 199US12140056B2✦ AISwitchable rocker arm3 cites · 202467% earned
- 296US12270323B2✦ AIHydraulic capsules for valvetrain assembly2 cites · 202476% earned
- 392US12180866B1✦ AIEngine valvetrain deactivation system with switchable rocker arm cam lift1 cites · 202467% earned
- 488US12173677B2Internal combustion engine1 cites · 202467% earned
- 583US11994042B1Adjustable reverse rotation camshaft drive mechanism1 cites · 202467% earned
- 679US12000314B1System and method for variable valve timing1 cites · 202467% earned
- 775US12320310B2Work vehicle compression ignition power system having thermally stratified engine combusti1 cites · 202456% earned
- 871US12097980B1Engine device for unmanned flying apparatus1 cites · 202467% earned
- 967US12104508B1Large-size diesel exhaust valve and manufacturing method thereof1 cites · 202467% earned
- 1063US12326323B2Anti-backlash apparatus and an actuator with anti-backlash transmission1 cites · 202467% earned
- 1158US12152512B2Rocker arm assembly comprising swing bridge0 cites · 20240% earned
- 1254US12563844B2Backside emitter solar cell structure having a heterojunction0 cites · 20240% earned
- 1350US12429010B2Air-cooled, four-stroke aviation engine0 cites · 20240% earned
- 1446US12366183B1Independent rotary valve engine0 cites · 20250% earned
- 1542US12163480B2Engine and method of operating the same0 cites · 20240% earned
- 1638US12078089B2Deactivating rocker arm and capsules0 cites · 20240% earned
- 1733US12467388B2System for synchronizing switching between two rockers0 cites · 20250% earned
- 1829US12480429B2Variable valve lift rocker arm assembly0 cites · 20240% earned
- 1925US12209515B2Dynamic cylinder deactivation life factor to modify cylinder deactivation strategy0 cites · 20240% earned
- 2021US12421877B2Variable cam timing phaser and system including the same0 cites · 20240% earned
- 2117US12435649B2Valve actuation system comprising a discrete lost motion device0 cites · 20240% earned
- 2213US12378903B2Latching pin assembly and deactivating rocker arm assembly0 cites · 20250% earned
- 238US12595753B2Rocker arm assembly0 cites · 20250% earned
- 244US12503965B2Castellation assembly, rocker arm, and actuator assembly therefor0 cites · 20240% earned
- 251US12286924B2Internal combustion engine and lubrication system thereof0 cites · 20240% earned
Active· last 5 yrs
The top-scoring F01L patents of the last 5 years
- 199US11761336B2✦ AIAdiabatic salt energy storage9 cites · 202172% earned
- 296US11229763B2✦ AIMechanical ventilator with oxygen concentrator9 cites · 202181% earned
- 392US11428127B2✦ AICastellation device, mechanical capsule, and rocker arm6 cites · 202274% earned
- 488US11306672B2Use of different pneumatic cylinder spring types in a variable displacement engine for eng6 cites · 202178% earned
- 583US11105277B1Method and system for variable displacement engine with AC power generation6 cites · 202185% earned
- 679US11306668B1Methods and systems for engine valve timing or lift adjustment5 cites · 202284% earned
- 775US11339690B2Balanced bridge bleeder brake with HLA5 cites · 202184% earned
- 871US11536167B2Method for manufacturing engine poppet valve5 cites · 202184% earned
- 967US11300018B2Hollow exhaust poppet valve6 cites · 202185% earned
- 1063US11280263B2Torque-actuated variable compression ratio phaser5 cites · 202184% earned
- 1158US11022078B1Methods for operating and controlling an internal combustion engine that exhausts no gas i5 cites · 202184% earned
- 1254US12163447B2Rocker arm assembly2 cites · 202367% earned
- 1350US11156197B1Methods and systems for engine cranking4 cites · 202182% earned
- 1446US11092090B1Multilink cranktrains with combined eccentric shaft and camshaft drive system for internal4 cites · 202182% earned
- 1542US12140056B2Switchable rocker arm3 cites · 202467% earned
- 1638US11598228B2Rocker arm assembly with valve bridge3 cites · 202172% earned
- 1733US11181018B1Type II valvetrain and hydraulic engine brake arrangement3 cites · 202172% earned
- 1829US11261807B2Dynamic valve control in a skip fire controlled engine3 cites · 202180% earned
- 1925US11454326B2Refuse vehicle body assembly3 cites · 202167% earned
- 2021US11125123B1Valve seat insert with soft landing insert design with contoured radii3 cites · 202172% earned
- 2117US11236651B2Exhaust valve assembly for a two-stroke internal combustion engine4 cites · 202175% earned
- 2213US11619149B2Compact engine brake with pressure-control reset2 cites · 202267% earned
- 238US11506134B1Control apparatus for electric vehicle2 cites · 202276% earned
- 244US12270323B2Hydraulic capsules for valvetrain assembly2 cites · 202476% earned
- 251US11131221B1Central valve for camshaft phaser3 cites · 202180% earned
All-time canon
The defining F01L patents of the whole record
- 199US4106446A✦ AIInternal combustion engine with auxiliary combustion chamber1,424 cites · 197895% earned
- 296US6366441B1✦ AIElectromagnetic actuator894 cites · 200295% earned
- 392US6891317B2✦ AIRolled electroactive polymers402 cites · 200395% earned
- 488US6276334B1Premixed charge compression ignition engine with optimal combustion control385 cites · 200195% earned
- 583US4009695AProgrammed valve system for internal combustion engine303 cites · 197794% earned
- 679US5544626AFinger follower rocker arm with engine valve deactivator303 cites · 199694% earned
- 775US5377631ASkip-cycle strategies for four cycle engine290 cites · 199594% earned
- 871US6208497B1System and method for servo control of nonlinear electromagnetic actuators259 cites · 200194% earned
- 967US6619258B2System for controllably disabling cylinders in an internal combustion engine259 cites · 200394% earned
- 1063US7064472B2Electroactive polymer devices for moving fluid242 cites · 200487% earned
- 1158US6223846B1Vehicle operating method and system234 cites · 200191% earned
- 1254US4960643AComposite synthetic materials218 cites · 199091% earned
- 1350US4805571AInternal combustion engine214 cites · 198994% earned
- 1446US4858572ADevice for adjusting an angular phase difference between two elements212 cites · 198994% earned
- 1542US5249554APowertrain component with adherent film having a graded composition201 cites · 199394% earned
- 1638US5107804AVariable camshaft timing for internal combustion engine187 cites · 199294% earned
- 1733US5636601AEnergization control method, and electromagnetic control system in electromagnetic driving184 cites · 199787% earned
- 1829US4829947AVariable lift operation of bistable electromechanical poppet valve actuator184 cites · 198994% earned
- 1925US6532920B1Multipositional lift rocker arm assembly184 cites · 200394% earned
- 2021US4533890APermanent magnet bistable solenoid actuator181 cites · 198594% earned
- 2117US5332348AFastening devices178 cites · 199490% earned
- 2213US6293246B1Spark-assist type self-ignition engine176 cites · 200194% earned
- 238US6279550B1Internal combustion engine171 cites · 200194% earned
- 244US5398502ASystem for controlling a valve mechanism for an internal combustion engine170 cites · 199594% earned
- 251US4253493AActuators169 cites · 198194% earned
Rising· last 2 yrs
Assignees whose newest F01L patents became public in the last 2 years — the current frontier
- 199HONDA MOTOR CO LTD700 patents · 11,724 citations
- 296TOYOTA MOTOR CO LTD496 patents · 7,425 citations
- 392CATERPILLAR INC269 patents · 3,922 citations
- 488NISSAN MOTOR291 patents · 6,808 citations
- 583DENSO CORP281 patents · 2,446 citations
- 679BORGWARNER INC176 patents · 1,766 citations
- 775MAZDA MOTOR147 patents · 2,427 citations
- 871JACOBS VEHICLE SYSTEMS INC88 patents · 769 citations
- 967MITSUBISHI ELECTRIC CORP96 patents · 1,286 citations
- 1063FIAT RICERCHE50 patents · 551 citations
- 1158HYUNDAI MOTOR CO LTD366 patents · 981 citations
- 1254MAHLE INT GMBH102 patents · 221 citations
- 1350CUMMINS INC55 patents · 98 citations
- 1446BRP ROTAX GMBH & CO KG15 patents · 75 citations
- 1542MIKUNI KOGYO KK27 patents · 84 citations
- 1638SCHAEFFLER TECHNOLOGIES AG364 patents · 353 citations
- 1733EATON INTELLIGENT POWER LTD190 patents · 105 citations
- 1829GM GLOBAL TECH OPERATIONS LLC95 patents · 132 citations
- 1925FERRARI SPA7 patents · 70 citations
- 2021DEERE & CO21 patents · 45 citations
- 2117HUSCO AUTOMOTIVE HOLDINGS LLC18 patents · 25 citations
- 2213SUZUKI MOTOR CORP40 patents · 16 citations
- 238TPR CO LTD5 patents · 31 citations
- 244SCANIA CV AB20 patents · 8 citations
- 251ARCTIC CAT INC6 patents · 17 citations
Active· last 5 yrs
Sustained F01L output across the last 5 years
- 199HONDA MOTOR CO LTD700 patents · 11,724 citations
- 296TOYOTA MOTOR CO LTD496 patents · 7,425 citations
- 392CATERPILLAR INC269 patents · 3,922 citations
- 488NISSAN MOTOR291 patents · 6,808 citations
- 583FORD GLOBAL TECH LLC426 patents · 4,156 citations
- 679DENSO CORP281 patents · 2,446 citations
- 775AISIN SEIKI233 patents · 2,550 citations
- 871BORGWARNER INC176 patents · 1,766 citations
- 967YAMAHA MOTOR CO LTD239 patents · 4,115 citations
- 1063MAZDA MOTOR147 patents · 2,427 citations
- 1158PORSCHE AG76 patents · 1,430 citations
- 1254NIPPON PISTON RING CO LTD42 patents · 810 citations
- 1350JACOBS VEHICLE SYSTEMS INC88 patents · 769 citations
- 1446BAYERISCHE MOTOREN WERKE AG68 patents · 746 citations
- 1542MITSUBISHI ELECTRIC CORP96 patents · 1,286 citations
- 1638JONES L E CO19 patents · 370 citations
- 1733FIAT RICERCHE50 patents · 551 citations
- 1829TULA TECHNOLOGY INC20 patents · 244 citations
- 1925NTN TOYO BEARING CO LTD39 patents · 463 citations
- 2021ISUZU MOTORS LTD36 patents · 479 citations
- 2117FUJI VALVE59 patents · 569 citations
- 2213HYUNDAI MOTOR CO LTD366 patents · 981 citations
- 238VOLKSWAGEN AG48 patents · 630 citations
- 244KAWASAKI HEAVY IND LTD39 patents · 440 citations
- 251TSUBAKIMOTO CHAIN CO20 patents · 271 citations
All-time canon
All-time PatentIndex Score in F01L
- 199HONDA MOTOR CO LTD700 patents · 11,724 citations
- 296FORD MOTOR CO104 patents · 4,105 citations
- 392STANFORD RES INST INT9 patents · 982 citations
- 488GEN MOTORS CORP200 patents · 6,304 citations
- 583LEMELSON JEROME H9 patents · 1,006 citations
- 679BORG WARNER AUTOMOTIVE39 patents · 2,123 citations
- 775DIESEL ENGINE RETARDERS INC55 patents · 3,430 citations
- 871DELPHI TECH INC217 patents · 4,625 citations
- 967CUMMINS ENGINE CO INC61 patents · 2,049 citations
- 1063TOYOTA MOTOR CO LTD496 patents · 7,425 citations
- 1158FORD GLOBAL TECH INC88 patents · 3,230 citations
- 1254CATERPILLAR INC269 patents · 3,922 citations
- 1350HITACHI LTD139 patents · 2,362 citations
- 1446NISSAN MOTOR291 patents · 6,808 citations
- 1542EATON CORP247 patents · 5,656 citations
- 1638FORD GLOBAL TECH LLC426 patents · 4,156 citations
- 1733FEV MOTORENTECH GMBH & CO KG46 patents · 1,658 citations
- 1829FUJI HEAVY IND LTD28 patents · 1,046 citations
- 1925BOMBARDIER ROTAX GMBH9 patents · 317 citations
- 2021DENSO CORP281 patents · 2,446 citations
- 2117STURMAN IND INC13 patents · 627 citations
- 2213JACOBS MFG CO20 patents · 975 citations
- 238AISIN SEIKI233 patents · 2,550 citations
- 244BORGWARNER INC176 patents · 1,766 citations
- 251YAMAHA MOTOR CO LTD239 patents · 4,115 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth