Topic leaderboard
Rotary-piston positive-displacement machines
Ranked by the PatentIndex Score — a 1–99 percentile within F04C · public-visibility date · generated 2026
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest F04C patents became public in the last 2 years — the current frontier
- 199Frederick E. Shelton, Iv60 patents · 46,337 citations
- 296Chester O. Baxter, Iii16 patents · 13,735 citations
- 392William B. Weisenburgh, Ii18 patents · 10,934 citations
- 488Charles J. Scheib25 patents · 13,759 citations
- 583Jeffrey S. Swayze11 patents · 5,890 citations
- 679Michael S. Cropper7 patents · 5,049 citations
- 775Christopher W. Widenhouse8 patents · 4,441 citations
- 871Andrew Frazier36 patents · 2,124 citations
- 967Scott J. Wolf36 patents · 2,124 citations
- 1063Larry B. Gray95 patents · 894 citations
- 1158Dean Kamen74 patents · 846 citations
- 1254Gary W. Knight6 patents · 3,907 citations
- 1350Eric Yeaton23 patents · 185 citations
- 1446Reiner Liebing9 patents · 374 citations
- 1542Isao Hayase28 patents · 747 citations
- 1638Frank S. Wallis22 patents · 726 citations
- 1733Robert C. Stover63 patents · 1,053 citations
- 1829Charles Raymond Kalina, Jr.6 patents · 252 citations
- 1925David S. Haffner6 patents · 252 citations
- 2021John Joseph Cogger6 patents · 252 citations
- 2117Masao Akei33 patents · 757 citations
- 2213Daniel R. Crum25 patents · 439 citations
- 238Kirill M. Ignatiev59 patents · 554 citations
- 244Stephanie A. Mutchler5 patents · 2,435 citations
- 251Ronald J. Forni20 patents · 365 citations
Active· last 5 yrs
Sustained F04C output across the last 5 years
- 199Frederick E. Shelton, Iv60 patents · 46,337 citations
- 296Barry C. Worrell14 patents · 12,089 citations
- 392Christopher J. Schall14 patents · 12,089 citations
- 488Joseph E. Young14 patents · 12,089 citations
- 583Jerome R. Morgan16 patents · 14,354 citations
- 679Taylor W. Aronhalt20 patents · 18,828 citations
- 775Chester O. Baxter, Iii16 patents · 13,735 citations
- 871William B. Weisenburgh, Ii18 patents · 10,934 citations
- 967Christopher J. Hess11 patents · 8,012 citations
- 1063Steven G. Hall10 patents · 6,898 citations
- 1158Gregory W. Johnson10 patents · 8,531 citations
- 1254Richard W. Timm9 patents · 7,353 citations
- 1350Charles J. Scheib25 patents · 13,759 citations
- 1446Jeffrey S. Swayze11 patents · 5,890 citations
- 1542Jeffrey L. Aldridge8 patents · 5,597 citations
- 1638Michael S. Cropper7 patents · 5,049 citations
- 1733Christopher W. Widenhouse8 patents · 4,441 citations
- 1829Daniel W. Price8 patents · 4,331 citations
- 1925Timothy G. Dietz8 patents · 4,331 citations
- 2021Ali A. Rostami26 patents · 912 citations
- 2117Barry S. Smith26 patents · 912 citations
- 2213Christopher S. Tucker26 patents · 912 citations
- 238Geoffrey Brandon Jordan26 patents · 912 citations
- 244Andrew Frazier36 patents · 2,124 citations
- 251Scott J. Wolf36 patents · 2,124 citations
All-time canon
Career PatentIndex Score in F04C
- 199Frederick E. Shelton, Iv60 patents · 46,337 citations
- 296Barry C. Worrell14 patents · 12,089 citations
- 392Christopher J. Schall14 patents · 12,089 citations
- 488Joseph E. Young14 patents · 12,089 citations
- 583Jerome R. Morgan16 patents · 14,354 citations
- 679Taylor W. Aronhalt20 patents · 18,828 citations
- 775Chester O. Baxter, Iii16 patents · 13,735 citations
- 871William B. Weisenburgh, Ii18 patents · 10,934 citations
- 967Christopher J. Hess11 patents · 8,012 citations
- 1063Steven G. Hall10 patents · 6,898 citations
- 1158Gregory W. Johnson10 patents · 8,531 citations
- 1254Tamara Widenhouse6 patents · 6,717 citations
- 1350Katherine J. Schmid11 patents · 11,878 citations
- 1446Richard W. Timm9 patents · 7,353 citations
- 1542Charles J. Scheib25 patents · 13,759 citations
- 1638Jeffrey S. Swayze11 patents · 5,890 citations
- 1733Jeffrey L. Aldridge8 patents · 5,597 citations
- 1829Michael S. Cropper7 patents · 5,049 citations
- 1925Emily A. Heeb4 patents · 5,810 citations
- 2021Andrew Yoo4 patents · 5,488 citations
- 2117Donna L. Korvick6 patents · 5,086 citations
- 2213Christopher W. Widenhouse8 patents · 4,441 citations
- 238Daniel W. Price8 patents · 4,331 citations
- 244Timothy G. Dietz8 patents · 4,331 citations
- 251Ali A. Rostami26 patents · 912 citations
Rising· last 2 yrs
The top-scoring F04C patents made public in the last 2 years
- 199US12137911B1✦ AISurgical device for controlled anchoring in the intestine4 cites · 202458% earned
- 296US12343288B2✦ AISystem and method for delivering multiple ocular implants4 cites · 202461% earned
- 392US12369963B1✦ AIMethods and devices to treat nasal airways1 cites · 202550% earned
- 488US11867176B1Method and apparatus for a submersible multistage labyrinth-screw pump4 cites · 202470% earned
- 583US11994232B1Electro-magnetic throttle valve with integrated blowdown conduit3 cites · 202467% earned
- 679US12203406B2Supercharged internal combustion engine2 cites · 202467% earned
- 775US12196209B2Multipath passive discharge valve for a compressor2 cites · 202476% earned
- 871US12292050B1Vacuum pump to generate a negative pressure2 cites · 202576% earned
- 967US12140143B1Fluid machine and operating method thereof2 cites · 202476% earned
- 1063US12320354B1Compression device having integrated discharge chamber(s) and compressor with compression 2 cites · 202576% earned
- 1158US11952899B1Bidirectional rotary hydraulic motor and pump3 cites · 202467% earned
- 1254US12196204B2Rotary piston compressor/pump/blower with a ventilation channel2 cites · 202458% earned
- 1350US12134054B2Filter system and replaceable filter cartridge2 cites · 202461% earned
- 1446US12180967B1Antirotation reed valve systems and methods for compressors2 cites · 202467% earned
- 1542US12123370B2Rotary engine shim design for floating side plates2 cites · 202476% earned
- 1638US12110796B1Seal assembly for a rotary engine housing2 cites · 202476% earned
- 1733US12006938B1Injection valve assembly for a compressor2 cites · 202476% earned
- 1829US12215687B2Scroll compressor and method for controlling scroll compressor2 cites · 202467% earned
- 1925US11879457B1Electric compressor with isolation constraint system2 cites · 202467% earned
- 2021US11994130B2Electric compressor bearing oil communication aperture2 cites · 202476% earned
- 2117US11905957B1Screw water pump with inner housing and outer housing2 cites · 202476% earned
- 2213US12281729B2Tube assembly, compressor, refrigeration apparatus, and method of manufacturing tube assem1 cites · 202467% earned
- 238US12292051B2Device for controlling a fluid mass flow for a device for compressing a gaseous fluid and 1 cites · 202467% earned
- 244US12152585B1Sealing soft water recovery apparatus for vacuum pump in vacuum pressure swing adsorption 1 cites · 202467% earned
- 251US12270398B1Compressor assemblies including lower covers having mounting feet skirts configured for in1 cites · 202567% earned
Active· last 5 yrs
The top-scoring F04C patents of the last 5 years
- 199US11278711B2✦ AIFluid pump changeable in diameter, in particular for medical application59 cites · 202177% earned
- 296US11260213B2✦ AIImpeller for catheter pump42 cites · 202181% earned
- 392US11357967B2✦ AIImpeller for catheter pump33 cites · 202180% earned
- 488US11766286B2Methods and devices to treat nasal airways24 cites · 202185% earned
- 583US11834940B1System and method of controlling single or dual pump operation11 cites · 202388% earned
- 679US11447004B2In-wheel motor vehicle drive apparatus19 cites · 202190% earned
- 775US11629713B1Electric compressor with oil separator and oil separator for use in an electrical compress12 cites · 202388% earned
- 871US11944573B2System and method for delivering multiple ocular implants14 cites · 202272% earned
- 967US11333068B1Side wall for rotary engine housing13 cites · 202288% earned
- 1063US11801084B2Methods and devices to treat nasal airways9 cites · 202357% earned
- 1158US11761376B1Side plate for rotary engine9 cites · 202387% earned
- 1254US11857191B2Method of chirurgical treatment using a surgical anchor device12 cites · 202169% earned
- 1350US11174857B1Digital pressure switch systems and methods11 cites · 202188% earned
- 1446US12053227B2Methods of treating nasal airways9 cites · 202277% earned
- 1542US11596490B2Application of force feedback on an input device to urge its operator to command an articu8 cites · 202173% earned
- 1638US11261858B2Adhesive and peripheral systems and methods for medical devices9 cites · 202150% earned
- 1733US12297835B2Screw compressor, refrigeration system, and method for controlling refrigeration system7 cites · 202386% earned
- 1829US11746782B2Low coefficient of expansion rotors for blowers6 cites · 202174% earned
- 1925US11913454B2Sliding component6 cites · 202385% earned
- 2021US12055143B2Screw compressor with adjustable passage7 cites · 202286% earned
- 2117US11975350B2Adhesive dispensing system with convertible nozzle assemblies3 cites · 202354% earned
- 2213US12023304B2Fluid transfer devices and methods of use4 cites · 202262% earned
- 238US11885333B2Fiber-reinforced rubber compound useful in PDM stators4 cites · 202362% earned
- 244US12369963B1Methods and devices to treat nasal airways1 cites · 202550% earned
- 251US11668304B2Low coefficient of expansion rotors for vacuum boosters5 cites · 202172% earned
All-time canon
The defining F04C patents of the whole record
- 199US9237891B2✦ AIRobotically-controlled surgical stapling devices that produce formed staples having differ2,056 cites · 201189% earned
- 296US9211120B2✦ AITissue thickness compensator comprising a plurality of medicaments1,715 cites · 201386% earned
- 392US8534528B2✦ AISurgical instrument having a multiple rate directional switching mechanism1,710 cites · 201196% earned
- 488US9283045B2Surgical instruments with fluid management system1,577 cites · 201496% earned
- 583US9220500B2Tissue thickness compensator comprising structure to produce a resilient load1,519 cites · 201288% earned
- 679US8827903B2Modular tool heads for use with circular surgical instruments1,501 cites · 201282% earned
- 775US8632462B2Trans-rectum universal ports1,495 cites · 201282% earned
- 871US9277919B2Tissue thickness compensator comprising fibers to produce a resilient load1,492 cites · 201288% earned
- 967US8734478B2Rectal manipulation devices1,483 cites · 201282% earned
- 1063US8978955B2Anvil assemblies with collapsible frames for circular staplers1,473 cites · 201282% earned
- 1158US8858590B2Tissue manipulation devices1,472 cites · 201282% earned
- 1254US9033204B2Circular stapling devices with tissue-puncturing anvil features1,465 cites · 201282% earned
- 1350US9480476B2Tissue thickness compensator comprising resilient members1,449 cites · 201288% earned
- 1446US9433419B2Tissue thickness compensator comprising a plurality of layers1,447 cites · 201288% earned
- 1542US9113883B2Collapsible anvil plate assemblies for circular surgical stapling devices1,445 cites · 201282% earned
- 1638US9113884B2Modular surgical tool systems1,444 cites · 201282% earned
- 1733US9198662B2Tissue thickness compensator having improved visibility1,440 cites · 201395% earned
- 1829US9439668B2Switch arrangements for ultrasonic surgical instruments1,434 cites · 201389% earned
- 1925US9125654B2Multiple part anvil assemblies for circular surgical stapling devices1,427 cites · 201282% earned
- 2021US9089330B2Surgical bowel retractor devices1,396 cites · 201282% earned
- 2117US9724118B2Techniques for cutting and coagulating tissue for ultrasonic surgical instruments1,384 cites · 201395% earned
- 2213US9211122B2Surgical access devices with anvil introduction and specimen retrieval structures1,381 cites · 201282% earned
- 238US9572592B2Surgical instrument with orientation sensing1,357 cites · 201391% earned
- 244US9241714B2Tissue thickness compensator and method for making the same1,341 cites · 201385% earned
- 251US9351730B2Tissue thickness compensator comprising channels1,322 cites · 201385% earned
Rising· last 2 yrs
Assignees whose newest F04C patents became public in the last 2 years — the current frontier
- 199AERIN MEDICAL INC34 patents · 1,868 citations
- 296DEKA PRODUCTS LP88 patents · 695 citations
- 392CARRIER CORP258 patents · 6,061 citations
- 488SANDEN CORP162 patents · 3,753 citations
- 583CILAG GMBH INT14 patents · 361 citations
- 679ECP ENTW MBH8 patents · 220 citations
- 775BITZER KUEHLMASCHINENBAU GMBH37 patents · 612 citations
- 871TC1 LLC9 patents · 371 citations
- 967MITSUBISHI ELECTRIC CORP245 patents · 3,745 citations
- 1063GLAUKOS CORP6 patents · 252 citations
- 1158DAIKIN IND LTD245 patents · 1,734 citations
- 1254GEN ELECTRIC40 patents · 857 citations
- 1350PARKER HANNIFIN CORP48 patents · 733 citations
- 1446TOYOTA JIDOSHOKKI KK208 patents · 1,189 citations
- 1542ATLAS COPCO AIRPOWER NV128 patents · 673 citations
- 1638EBARA CORP40 patents · 642 citations
- 1733SCHLUMBERGER TECHNOLOGY CORP24 patents · 303 citations
- 1829LG ELECTRONICS INC443 patents · 1,967 citations
- 1925SAMSUNG ELECTRONICS CO LTD111 patents · 1,026 citations
- 2021ICU MEDICAL INC6 patents · 149 citations
- 2117BOSCH GMBH ROBERT137 patents · 1,090 citations
- 2213PROCTER & GAMBLE22 patents · 148 citations
- 238KHOSROVANINEJAD CHARAM9 patents · 72 citations
- 244HONDA MOTOR CO LTD38 patents · 255 citations
- 251TRANE INT INC91 patents · 235 citations
Active· last 5 yrs
Sustained F04C output across the last 5 years
- 199AERIN MEDICAL INC34 patents · 1,868 citations
- 296COVIDIEN LP37 patents · 3,128 citations
- 392EMERSON CLIMATE TECHNOLOGIES258 patents · 3,503 citations
- 488DEKA PRODUCTS LP88 patents · 695 citations
- 583HITACHI LTD285 patents · 8,759 citations
- 679CARRIER CORP258 patents · 6,061 citations
- 775ALTRIA CLIENT SERVICES LLC20 patents · 195 citations
- 871SANDEN CORP162 patents · 3,753 citations
- 967DENSO CORP127 patents · 1,626 citations
- 1063CILAG GMBH INT14 patents · 361 citations
- 1158ECP ENTW MBH8 patents · 220 citations
- 1254BITZER KUEHLMASCHINENBAU GMBH37 patents · 612 citations
- 1350TC1 LLC9 patents · 371 citations
- 1446MITSUBISHI HEAVY IND LTD108 patents · 1,750 citations
- 1542MITSUBISHI ELECTRIC CORP245 patents · 3,745 citations
- 1638GLAUKOS CORP6 patents · 252 citations
- 1733TOSHIBA KK106 patents · 2,194 citations
- 1829DAIKIN IND LTD245 patents · 1,734 citations
- 1925GEN ELECTRIC40 patents · 857 citations
- 2021DEPUY SYNTHES PRODUCTS INC14 patents · 492 citations
- 2117AIR SQUARED INC25 patents · 498 citations
- 2213PARKER HANNIFIN CORP48 patents · 733 citations
- 238TOYOTA JIDOSHOKKI KK208 patents · 1,189 citations
- 244ARTHROSURFACE INC10 patents · 169 citations
- 251ATLAS COPCO AIRPOWER NV128 patents · 673 citations
All-time canon
All-time PatentIndex Score in F04C
- 199SHELTON IV FREDERICK E7 patents · 10,873 citations
- 296ETHICON ENDO SURGERY INC15 patents · 11,037 citations
- 392ETHICON LLC17 patents · 3,629 citations
- 488ALTRIA CLIENT SERVICES INC6 patents · 717 citations
- 583AERIN MEDICAL INC34 patents · 1,868 citations
- 679ETHICON ENDO SURGERY LLC8 patents · 2,403 citations
- 775COVIDIEN LP37 patents · 3,128 citations
- 871COPELAND CORP168 patents · 11,741 citations
- 967KAMEN DEAN18 patents · 489 citations
- 1063MASHIACH ADI30 patents · 1,138 citations
- 1158EMERSON CLIMATE TECHNOLOGIES258 patents · 3,503 citations
- 1254COLTEC IND INC20 patents · 1,018 citations
- 1350DEKA PRODUCTS LP88 patents · 695 citations
- 1446MEDTRONIC INC20 patents · 481 citations
- 1542HITACHI LTD285 patents · 8,759 citations
- 1638INGERSOLL RAND CO87 patents · 2,380 citations
- 1733ARONHALT TAYLOR W3 patents · 4,345 citations
- 1829CARRIER CORP258 patents · 6,061 citations
- 1925GRAY LARRY B15 patents · 130 citations
- 2021SCROLL TECH151 patents · 3,317 citations
- 2117MATSUSHITA ELECTRIC INDUSTRIAL CO LTD195 patents · 4,882 citations
- 2213COCA COLA CO7 patents · 686 citations
- 238AMERICAN STANDARD INC50 patents · 2,354 citations
- 244ALTRIA CLIENT SERVICES LLC20 patents · 195 citations
- 251SANDEN CORP162 patents · 3,753 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth