Topic leaderboard
Electrography & electrophotography
Ranked by the PatentIndex Score — a 1–99 percentile within G03G · public-visibility date · generated 2026-07-19
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest G03G patents became public in the last 2 years — the current frontier
- 199Atsushi Numagami102 patents · 8,779 citations
- 296Masanari Morioka104 patents · 2,819 citations
- 392Shinya Noda61 patents · 4,055 citations
- 488Hiroomi Matsuzaki66 patents · 3,431 citations
- 583Yasushi Okabe202 patents · 2,277 citations
- 679Masato Hisano33 patents · 707 citations
- 775Kazunari Murayama67 patents · 4,187 citations
- 871Shinjiro Toba56 patents · 2,958 citations
- 967Fumio Tazawa79 patents · 2,321 citations
- 1063Kazuhiko Kanno79 patents · 4,534 citations
- 1158Susumu Nittani75 patents · 2,681 citations
- 1254Shigeru Hoashi28 patents · 971 citations
- 1350Tadayuki Tsuda81 patents · 5,201 citations
- 1446Jun Miyamoto27 patents · 1,243 citations
- 1542Isao Koishi48 patents · 1,252 citations
- 1638Toru Oguma70 patents · 2,364 citations
- 1733Tachio Kawai65 patents · 2,198 citations
- 1829Takeyuki Takagi77 patents · 761 citations
- 1925Hideki Maeshima64 patents · 1,537 citations
- 2021Toshiaki Nagashima84 patents · 1,357 citations
- 2117Teruhiko Sasaki62 patents · 1,075 citations
- 2213Ayatomo Okino97 patents · 967 citations
- 238Tomio Noguchi51 patents · 1,004 citations
- 244Jun Azuma54 patents · 691 citations
- 251Ryuta Murakami50 patents · 1,048 citations
Active· last 5 yrs
Sustained G03G output across the last 5 years
- 199Atsushi Numagami102 patents · 8,779 citations
- 296Kazuo Chadani71 patents · 3,823 citations
- 392Masanari Morioka104 patents · 2,819 citations
- 488Shinya Noda61 patents · 4,055 citations
- 583Hiroomi Matsuzaki66 patents · 3,431 citations
- 679Yasushi Okabe202 patents · 2,277 citations
- 775Masato Hisano33 patents · 707 citations
- 871Kazunari Murayama67 patents · 4,187 citations
- 967Shinjiro Toba56 patents · 2,958 citations
- 1063Fumio Tazawa79 patents · 2,321 citations
- 1158Kazuhiko Kanno79 patents · 4,534 citations
- 1254Susumu Nittani75 patents · 2,681 citations
- 1350Takeshi Arimitsu37 patents · 2,560 citations
- 1446Hisayoshi Kojima40 patents · 2,678 citations
- 1542Shigeru Hoashi28 patents · 971 citations
- 1638Tadayuki Tsuda81 patents · 5,201 citations
- 1733Jun Miyamoto27 patents · 1,243 citations
- 1829Hironori Minagawa64 patents · 1,457 citations
- 1925Isao Koishi48 patents · 1,252 citations
- 2021Toru Oguma70 patents · 2,364 citations
- 2117Tsukuru Kai67 patents · 2,161 citations
- 2213Tadashi Horikawa38 patents · 1,119 citations
- 238Tachio Kawai65 patents · 2,198 citations
- 244Takeyuki Takagi77 patents · 761 citations
- 251Hideki Maeshima64 patents · 1,537 citations
All-time canon
Career PatentIndex Score in G03G
- 199Raj D. Patel133 patents · 17,122 citations
- 296Tetsuro Motoyama48 patents · 3,182 citations
- 392Michael A. Hopper56 patents · 7,583 citations
- 488Walter Mychajlowskij41 patents · 3,535 citations
- 583T. Hwee Ng20 patents · 1,895 citations
- 679E. Neal Tompkins33 patents · 1,653 citations
- 775Michael W. Barry20 patents · 1,204 citations
- 871Francis A. Rowe18 patents · 1,178 citations
- 967David J. Sanders25 patents · 1,792 citations
- 1063Daniel A. Foucher26 patents · 2,504 citations
- 1158Akira Higeta37 patents · 2,196 citations
- 1254Toshiharu Kawai28 patents · 2,167 citations
- 1350Michael L. Bullock10 patents · 1,599 citations
- 1446Isao Ikemoto84 patents · 6,302 citations
- 1542Kazuo Shishido18 patents · 2,057 citations
- 1638Hiroo Kobayashi25 patents · 2,168 citations
- 1733Yoshiya Nomura41 patents · 4,055 citations
- 1829Takaaki Yanagisawa28 patents · 1,960 citations
- 1925Peter A. Zuber24 patents · 1,117 citations
- 2021John F. Yanus165 patents · 5,486 citations
- 2117B. Mark Hirst18 patents · 1,645 citations
- 2213Atsushi Numagami102 patents · 8,779 citations
- 238Robert E. Haines17 patents · 1,004 citations
- 244Kazuo Chadani71 patents · 3,823 citations
- 251Damodar M. Pai118 patents · 5,049 citations
Rising· last 2 yrs
The top-scoring G03G patents made public in the last 2 years
- 199US12135508B2✦ AIImage forming apparatus6 cites · 202464% earned
- 296US12099321B2✦ AIImage forming system4 cites · 202482% earned
- 392US12235597B2✦ AIDeveloping cartridge capable of reducing size of image forming apparatus2 cites · 202446% earned
- 488US12332585B2Seal member and toner storage container including same2 cites · 202476% earned
- 583US12429800B2Image forming apparatus with fixing device having lever and fixed handle2 cites · 202476% earned
- 679US12197145B1Developing cartridge2 cites · 202576% earned
- 775US12346057B1Process cartridge1 cites · 202567% earned
- 871US12099315B2Image forming apparatus2 cites · 202461% earned
- 967US12078953B2Image forming apparatus and fixing unit2 cites · 202461% earned
- 1063US12072663B2Image forming apparatus including a detachable unit with positioning portions2 cites · 202461% earned
- 1158US12443137B2Image forming apparatus having a rotary and detachable toner cartridges2 cites · 202467% earned
- 1254US12264037B2Sheet conveyance apparatus and image forming apparatus2 cites · 202476% earned
- 1350US12140897B2Image forming apparatus capable of supporting manual feed tray at predetermined angle2 cites · 202476% earned
- 1446US11892780B1Image forming apparatus and process cartridge2 cites · 202476% earned
- 1542US12282284B2Image forming apparatus having residual toner collecting containers1 cites · 202446% earned
- 1638US12344498B2Image forming system and charge eliminating apparatus1 cites · 202450% earned
- 1733US12386305B2Developing cartridge and electronic imaging apparatus1 cites · 202450% earned
- 1829US11880151B1Image forming apparatus and control method2 cites · 202467% earned
- 1925US12504934B2Inspection apparatus and control method of inspection apparatus for detecting an image def1 cites · 202456% earned
- 2021US11906917B1Fixing device2 cites · 202467% earned
- 2117US12422774B2Printing system, control method therefor, and storage medium1 cites · 202456% earned
- 2213US12092990B2Toner containers having electrical connectors of different positions2 cites · 202467% earned
- 238US12393145B2Fixing device and image forming apparatus with nip portion that prevents belt cracking and1 cites · 202456% earned
- 244US12461481B2Image forming apparatus having cover to cover image forming units1 cites · 202556% earned
- 251US12353155B2Static elimination apparatus and image forming system1 cites · 202456% earned
Active· last 5 yrs
The top-scoring G03G patents of the last 5 years
- 199US11137716B2✦ AIProcess cartridge and electrophotographic apparatus22 cites · 202190% earned
- 296US11112719B2✦ AIProcess cartridge and electrophotographic apparatus capable of suppressing lateral running20 cites · 202190% earned
- 392US11366402B2✦ AIProcess cartridge and electrophotographic apparatus using the same18 cites · 202189% earned
- 488US11340553B2Process cartridge and electrophotographic apparatus18 cites · 202189% earned
- 583US11169458B2Toner17 cites · 202189% earned
- 679US11175600B2Toner16 cites · 202189% earned
- 775US11592766B2Toner container and image forming system10 cites · 202373% earned
- 871US11630975B1Secondary color uniformity compensation mechanism10 cites · 202387% earned
- 967US11392050B2Process cartridge and electrophotographic apparatus14 cites · 202189% earned
- 1063US12135508B2Image forming apparatus6 cites · 202464% earned
- 1158US11256187B2Process cartridge and electrophotographic apparatus12 cites · 202188% earned
- 1254US11249408B2Toner12 cites · 202188% earned
- 1350US12001158B2Fixing member, method for producing the same, fixing apparatus, and electrophotographic im8 cites · 202386% earned
- 1446US11281152B1Housing and image forming apparatus10 cites · 202287% earned
- 1542US11644777B2Pressurizing member, fixing device, and electrophotographic image-forming apparatus7 cites · 202286% earned
- 1638US12066785B2Cartridge and image forming apparatus5 cites · 202372% earned
- 1733US11314178B2Toner10 cites · 202181% earned
- 1829US12044992B2Image-forming apparatus provided with mechanism for opening and closing shutter of fixing 5 cites · 202377% earned
- 1925US11347157B2Toner10 cites · 202187% earned
- 2021US11175602B2Electroconductive member, process cartridge, and electrophotographic image forming apparat10 cites · 202187% earned
- 2117US11353822B2Cartridge and electrophotographic image forming apparatus8 cites · 202166% earned
- 2213US11327435B2Drum unit, cartridge, process cartridge and electrophotographic image forming apparatus ha8 cites · 202169% earned
- 238US11397400B2Image forming apparatus with developer collection8 cites · 202176% earned
- 244US11467514B2Image forming apparatus and image forming system8 cites · 202180% earned
- 251US11385588B2Sheet laminator, image forming apparatus, and image forming system8 cites · 202186% earned
All-time canon
The defining G03G patents of the whole record
- 199US7361168B2✦ AIImplantable device and methods for delivering drugs and other substances to treat sinusiti1,458 cites · 200589% earned
- 296US4265990A✦ AIImaging system with a diamine charge transport material in a polycarbonate resin1,169 cites · 198195% earned
- 392US8599450B2✦ AIImage read device and copier1,026 cites · 201295% earned
- 488US5290654AMicrosuspension processes for toner compositions900 cites · 199495% earned
- 583US6055062AElectronic printer having wireless power and communications connections to accessory units807 cites · 200095% earned
- 679US5287194ADistributed printing772 cites · 199495% earned
- 775US4338390AQuarternary ammonium sulfate or sulfonate charge control agents for electrophotographic de730 cites · 198295% earned
- 871US7002728B2Electrophoretic particles, and processes for the production thereof708 cites · 200595% earned
- 967US6323989B1Electrophoretic displays using nanoparticles668 cites · 200195% earned
- 1063US5346797AToner processes666 cites · 199495% earned
- 1158US4421264AVariable thickness set compensation for stapler657 cites · 198395% earned
- 1254US5418108AToner emulsion aggregation process646 cites · 199595% earned
- 1350US5403693AToner aggregation and coalescence processes644 cites · 199595% earned
- 1446US5364729AToner aggregation processes635 cites · 199495% earned
- 1542US5444779AElectronic copyright royalty accounting system using glyphs622 cites · 199595% earned
- 1638US4937166APolymer coated carrier particles for electrophotographic developers613 cites · 199095% earned
- 1733US5308734AToner processes592 cites · 199495% earned
- 1829US4935326AElectrophotographic carrier particles coated with polymer mixture589 cites · 199095% earned
- 1925US5278020AToner composition and processes thereof572 cites · 199495% earned
- 2021US4961088AMonitor/warranty system for electrostatographic reproducing machines using replaceable car561 cites · 199095% earned
- 2117US4587189APhotoconductive imaging members with perylene pigment compositions560 cites · 198695% earned
- 2213US5370963AToner emulsion aggregation processes560 cites · 199495% earned
- 238US5344738AProcess of making toner compositions556 cites · 199495% earned
- 244US4560635AToner compositions with ammonium sulfate charge enhancing additives538 cites · 198595% earned
- 251US5501935AToner aggregation processes508 cites · 199695% earned
Rising· last 2 yrs
Assignees whose newest G03G patents became public in the last 2 years — the current frontier
- 199XEROX CORP7,866 patents · 179,905 citations
- 296CANON KK15,546 patents · 202,786 citations
- 392EASTMAN KODAK CO1,969 patents · 38,393 citations
- 488BROTHER IND LTD3,346 patents · 17,001 citations
- 583HEWLETT PACKARD DEVELOPMENT CO1,060 patents · 4,899 citations
- 679SEIKO EPSON CORP790 patents · 6,558 citations
- 775LEXMARK INT INC1,015 patents · 9,474 citations
- 871SHARP KK1,985 patents · 17,934 citations
- 967TOSHIBA TEC KK1,106 patents · 5,454 citations
- 1063RICOH CO LTD876 patents · 3,518 citations
- 1158E INK CORP8 patents · 1,426 citations
- 1254LANDA CORP LTD43 patents · 483 citations
- 1350OKI ELECTRIC IND CO LTD101 patents · 1,001 citations
- 1446GEN PLASTIC IND CO LTD65 patents · 565 citations
- 1542MITSUBISHI CHEM CORP136 patents · 801 citations
- 1638TAKAMI NOBUO11 patents · 59 citations
- 1733TOSHIBA LIGHTING & TECHNOLOGY13 patents · 132 citations
- 1829LANDA LABS 2012 LTD24 patents · 69 citations
- 1925KYOCERA DOCUMENT SOLUTIONS INC2,708 patents · 1,748 citations
- 2021FUJIFILM CORP76 patents · 218 citations
- 2117KONICA MINOLTA INC1,499 patents · 967 citations
- 2213AVISION INC46 patents · 108 citations
- 238MATSUDA NAOKI22 patents · 37 citations
- 244OBUCHI YUSUKE21 patents · 80 citations
- 251SAMSUNG DISPLAY CO LTD8 patents · 55 citations
Active· last 5 yrs
Sustained G03G output across the last 5 years
- 199XEROX CORP7,866 patents · 179,905 citations
- 296CANON KK15,546 patents · 202,786 citations
- 392EASTMAN KODAK CO1,969 patents · 38,393 citations
- 488BROTHER IND LTD3,346 patents · 17,001 citations
- 583HEWLETT PACKARD DEVELOPMENT CO1,060 patents · 4,899 citations
- 679FUJI XEROX CO LTD3,577 patents · 27,483 citations
- 775TOSHIBA KK1,870 patents · 17,186 citations
- 871SEIKO EPSON CORP790 patents · 6,558 citations
- 967IBM266 patents · 6,878 citations
- 1063LEXMARK INT INC1,015 patents · 9,474 citations
- 1158CABOT CORP32 patents · 1,096 citations
- 1254SHARP KK1,985 patents · 17,934 citations
- 1350TOSHIBA TEC KK1,106 patents · 5,454 citations
- 1446DAINIPPON PRINTING CO LTD82 patents · 1,320 citations
- 1542SAMSUNG ELECTRONICS CO LTD1,833 patents · 12,959 citations
- 1638RICOH CO LTD876 patents · 3,518 citations
- 1733KYOCERA CORP85 patents · 1,071 citations
- 1829OKI DATA KK792 patents · 4,094 citations
- 1925E INK CORP8 patents · 1,426 citations
- 2021LANDA CORP LTD43 patents · 483 citations
- 2117STRATASYS INC34 patents · 563 citations
- 2213OKI ELECTRIC IND CO LTD101 patents · 1,001 citations
- 238GEN PLASTIC IND CO LTD65 patents · 565 citations
- 244FUJI ELECTRIC CO LTD172 patents · 1,555 citations
- 251BRIDGESTONE CORP89 patents · 1,245 citations
All-time canon
All-time PatentIndex Score in G03G
- 199XEROX CORP7,866 patents · 179,905 citations
- 296RICOH KK4,280 patents · 112,974 citations
- 392HEWLETT PACKARD CO286 patents · 10,557 citations
- 488CANON KK15,546 patents · 202,786 citations
- 583SILVERBROOK RES PTY LTD163 patents · 1,720 citations
- 679EASTMAN KODAK CO1,969 patents · 38,393 citations
- 775COPYTELE INC15 patents · 2,220 citations
- 871TR SYSTEMS INC9 patents · 802 citations
- 967BROTHER IND LTD3,346 patents · 17,001 citations
- 1063HEWLETT PACKARD DEVELOPMENT CO1,060 patents · 4,899 citations
- 1158FUJI XEROX CO LTD3,577 patents · 27,483 citations
- 1254TOSHIBA KK1,870 patents · 17,186 citations
- 1350SEIKO EPSON CORP790 patents · 6,558 citations
- 1446TEXAS INSTRUMENTS INC23 patents · 1,404 citations
- 1542IBM266 patents · 6,878 citations
- 1638FOTO WEAR INC17 patents · 1,043 citations
- 1733LEXMARK INT INC1,015 patents · 9,474 citations
- 1829FUJI PHOTO FILM CO LTD574 patents · 6,358 citations
- 1925MINOLTA CAMERA KK1,168 patents · 19,655 citations
- 2021KONISHIROKU PHOTO IND1,111 patents · 19,507 citations
- 2117CABOT CORP32 patents · 1,096 citations
- 2213SAWGRASS SYSTEMS INC18 patents · 1,351 citations
- 238UENO TAKAHITO7 patents · 249 citations
- 244IMATION CORP28 patents · 1,231 citations
- 251T R SYSTEMS7 patents · 721 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth