Topic leaderboard
Treatment of materials before paper-making
Ranked by the PatentIndex Score — a 1–99 percentile within D21D · public-visibility date · generated 2026
top 25 per window · public-visibility date
Rising· last 2 yrs
Inventors whose newest D21D patents became public in the last 2 years — the current frontier
- 199Luc Gingras49 patents · 587 citations
- 296Zhiying Yu2 patents · 5 citations
- 392Christophe Roger Hayart3 patents · 3 citations
- 488Robert William Gooding4 patents · 2 citations
- 583Benoit Martineau3 patents · 2 citations
- 679Jeffrey Leigh Jennings2 patents · 2 citations
- 775Israel Paquette2 patents · 2 citations
- 871Mathieu Hamelin4 patents · 0 citations
- 967Cameron Coale Demler2 patents · 0 citations
- 1063Robert Short3 patents · 0 citations
- 1158ANDERSON DWIGHT EDWARD1 patents · 0 citations
- 1254Alain Lascar1 patents · 0 citations
- 1350Bryson Hepler1 patents · 0 citations
- 1446Constantin Kemmer1 patents · 0 citations
- 1542Duane D. Ehlke1 patents · 0 citations
- 1638Hugues Grossmann1 patents · 0 citations
- 1733Matthew D. Eggert1 patents · 0 citations
- 1829Sotaro Oana1 patents · 0 citations
- 1925Steve Enzor1 patents · 0 citations
- 2021Thomas Jaschek1 patents · 0 citations
- 2117Uwe Rothaug1 patents · 0 citations
- 2213DEBNATH MRITTIKA1 patents · 0 citations
- 238HEJDUK MAREK1 patents · 0 citations
- 244HELLSTRÖM LARS1 patents · 0 citations
- 251KARNETH AARON1 patents · 0 citations
Active· last 5 yrs
Sustained D21D output across the last 5 years
- 199Luc Gingras49 patents · 587 citations
- 296John Claude Husband10 patents · 92 citations
- 392Per Svending10 patents · 92 citations
- 488Christopher L. Demler8 patents · 171 citations
- 583Tafadzwa Motsi8 patents · 82 citations
- 679Alan Coles5 patents · 81 citations
- 775Mikko Likitalo5 patents · 81 citations
- 871Kari Peltonen6 patents · 88 citations
- 967Harshad Pande7 patents · 45 citations
- 1063Bruno Marcoccia5 patents · 43 citations
- 1158Petteri Vuorio9 patents · 43 citations
- 1254Christer Hedlund9 patents · 28 citations
- 1350Lahoucine Ettaleb4 patents · 58 citations
- 1446Valentina Kucher5 patents · 26 citations
- 1542Dwight Edward Anderson6 patents · 12 citations
- 1638Thommy Lindblom14 patents · 16 citations
- 1733Håkan Sjöström10 patents · 14 citations
- 1829Ronald J. Defoe3 patents · 44 citations
- 1925Tomi Iisakkila7 patents · 10 citations
- 2021Dale Gary Kavalew5 patents · 7 citations
- 2117Alexander Moeller3 patents · 11 citations
- 2213Nastaran Krawczyk3 patents · 11 citations
- 238Makhlouf Laleg2 patents · 49 citations
- 244Alexander Gscheider8 patents · 12 citations
- 251Yves Raymond5 patents · 12 citations
All-time canon
Career PatentIndex Score in D21D
- 199Luc Gingras49 patents · 587 citations
- 296Rolf B. Reinhall19 patents · 444 citations
- 392David E. Chupka22 patents · 481 citations
- 488Klaus Doelle7 patents · 257 citations
- 583Frey Frejborg16 patents · 317 citations
- 679William A. Gero8 patents · 274 citations
- 775Marc Sabourin16 patents · 278 citations
- 871Mark S. Lutz6 patents · 170 citations
- 967John B. Matthew10 patents · 207 citations
- 1063Johan Gullichsen8 patents · 235 citations
- 1158Toivo Niskanen7 patents · 196 citations
- 1254Ola M. Johansson15 patents · 234 citations
- 1350Ronny Hoglund8 patents · 249 citations
- 1446Nils Virving19 patents · 282 citations
- 1542Rune H. Frykhult15 patents · 279 citations
- 1638Lars Obitz5 patents · 178 citations
- 1733Frank Paskowski6 patents · 187 citations
- 1829Toshiaki Yamagami13 patents · 144 citations
- 1925Risto Ljokkoi11 patents · 230 citations
- 2021Louis O. Torregrossa5 patents · 157 citations
- 2117Emil Holz12 patents · 229 citations
- 2213Gregory A. Garasimowicz5 patents · 128 citations
- 238Olavi Pikka10 patents · 163 citations
- 244Reimund Rienecker12 patents · 179 citations
- 251W. Thomas Gauld5 patents · 158 citations
Rising· last 2 yrs
The top-scoring D21D patents made public in the last 2 years
- 199US12146262B2✦ AINon-wood pulp having high brightness and low debris5 cites · 202469% earned
- 295US11905661B1✦ AIPaper pulp pressure screen2 cites · 202461% earned
- 389US12553182B2✦ AIApparatus and method for processing wood fibers0 cites · 20240% earned
- 484US12440870B2Rotor with forward-swept struts for pressure screen cylinders0 cites · 20240% earned
- 579US12215462B2Refiner0 cites · 20240% earned
- 674US11851816B2Supported toothed plates in a disperser including bridge between teeth with cross-sectiona0 cites · 20240% earned
- 768US12060680B2Accessory for disc refiner0 cites · 20240% earned
- 863US12123141B2Screen cylinder0 cites · 20240% earned
- 958US12508601B2Refining device0 cites · 20240% earned
- 1053US12264440B2Process and apparatus for producing a molded fiber article0 cites · 20240% earned
- 1147US12533679B2Refining device0 cites · 20240% earned
- 1242US12509825B2Screen cylinder with bars configured to receive a wear resistant spray coating0 cites · 20250% earned
- 1337US12129599B2Pressure screen for a fiber web product process with removable cover0 cites · 20240% earned
- 1432US12571161B2Deflaking element for pulper0 cites · 20240% earned
- 1526US12553184B2Hemp paper packaging material for foodstuff0 cites · 20240% earned
- 1621US12435470B2Method for optimizing the refining energy during an operation of refining of a fiber compo0 cites · 20250% earned
- 1716US12239997B2Multistage screen sorting device0 cites · 20240% earned
- 1811US12214359B1Colloid mill0 cites · 20250% earned
- 195US12565735B2Methods for producing pulp and paper products from plants having bast and hurd fibers0 cites · 20240% earned
- 201US12595624B2Water and air separation device for removing air from a whitewater spray0 cites · 20240% earned
Active· last 5 yrs
The top-scoring D21D patents of the last 5 years
- 199US12146262B2✦ AINon-wood pulp having high brightness and low debris5 cites · 202469% earned
- 296US11624154B2✦ AIMethod for preparing unbleached biomechanical pulp from straw6 cites · 202185% earned
- 392US11905661B1✦ AIPaper pulp pressure screen2 cites · 202461% earned
- 488US11828023B2Pulp transportation system2 cites · 202376% earned
- 583US12037745B2Process for producing binderless formaldehyde-free fiberboard and coproducing fulvic acid 2 cites · 202276% earned
- 679US11846070B2Screen cylinder2 cites · 202167% earned
- 775US11628446B2Flinger apparatus for a counter-rotating refiner2 cites · 202176% earned
- 871US11834785B2Method of transforming high consistency pulp fibers into pre-dispersed semi-dry and dry fi3 cites · 202180% earned
- 967US11674264B2System for treatment of a biomass material and a method for connecting a valve to a transp2 cites · 202176% earned
- 1063US11982053B2Refiner plate having inter-bar wear protrusions2 cites · 202276% earned
- 1158US11831017B2Redox flow battery electrolytes2 cites · 202176% earned
- 1254US11660661B2Method for producing a refiner disc segment1 cites · 202267% earned
- 1350US11732411B2Paper filler composition1 cites · 202239% earned
- 1446US12116732B2Paper products incorporating surface enhanced pulp fibers and having decoupled wet and dry1 cites · 202267% earned
- 1542US12215463B2Process for producing paper or board and a product thereof1 cites · 202267% earned
- 1638US11773537B2Sulfonated lignin-derived compounds and uses thereof0 cites · 20230% earned
- 1733US11834787B2Process for producing strong and soft tissue and towel products0 cites · 20210% earned
- 1829US11879211B2Process for separating trichomes from non-trichome materials0 cites · 20220% earned
- 1925US11905658B2Apparatus and method for processing wood fibers0 cites · 20210% earned
- 2021US11982054B2Apparatus and method for processing wood fibers0 cites · 20230% earned
- 2117US12553182B2Apparatus and method for processing wood fibers0 cites · 20240% earned
- 2213US12070776B2Rotor with forward-swept struts for pressure screen cylinders0 cites · 20230% earned
- 238US12442135B2Screen cylinder with improved slot width protection and method of removing solid contamina0 cites · 20220% earned
- 244US12123140B2Process to produce microfibrillated cellulose by impacts0 cites · 20210% earned
- 251US11643778B2Disperser plates with intermeshing teeth and outer refining section0 cites · 20220% earned
All-time canon
The defining D21D patents of the whole record
- 199US6183596B1✦ AISuper microfibrillated cellulose, process for producing the same, and coated paper and tin290 cites · 200191% earned
- 296US6214163B1✦ AISuper microfibrillated cellulose, process for producing the same, and coated paper and tin181 cites · 200190% earned
- 392US5527473A✦ AIProcess for performing reactions in a liquid-solid catalyst slurry162 cites · 199694% earned
- 488US5209641AApparatus for fluidizing, degassing and pumping a suspension of fibrous cellulose material141 cites · 199393% earned
- 583US7381294B2Method and apparatus for manufacturing microfibrillated cellulose fiber140 cites · 200593% earned
- 679US5385640AProcess for making microdenominated cellulose129 cites · 199593% earned
- 775US5425508AHigh flow, low intensity plate for disc refiner121 cites · 199593% earned
- 871US6202946B1Method and apparatus of defibrating a fibre-containing material115 cites · 200193% earned
- 967US6617720B1Integrated paper pulp and process machinery having integrated drive and control and method104 cites · 200393% earned
- 1063US3996012ACatalytic reactor having disk-shaped, rotor-stator, reaction surfaces98 cites · 197693% earned
- 1158US5269470AMethod of producing finely divided fibrous cellulose particles95 cites · 199393% earned
- 1254US5893525ARefiner plate with variable pitch93 cites · 199993% earned
- 1350US5968357AScreen basket having a removable and replaceable cylindrical mesh liner92 cites · 199993% earned
- 1446US4011027AStain removal apparatus90 cites · 197793% earned
- 1542US8012312B2Cellulose-based fibrous materials84 cites · 200993% earned
- 1638US8795470B2System and method for producing bonded fiber/cellulose products82 cites · 201389% earned
- 1733US5618424ARotary drum type device for separating solid particles from a liquid81 cites · 199789% earned
- 1829US5803270AMethods and apparatus for acoustic fiber fractionation80 cites · 199889% earned
- 1925US5405499ACellulose pulps having improved softness potential77 cites · 199589% earned
- 2021US5601690AMethod for screening pulp77 cites · 199793% earned
- 2117US5064537ASeamless screen cylinder with laser cut openings76 cites · 199193% earned
- 2213US4986900ASectional screen cylinder73 cites · 199193% earned
- 238US4954249AWave screen plate73 cites · 199093% earned
- 244US5695136ARefining element72 cites · 199793% earned
- 251US8882965B2Paper recycling system and paper recycling method71 cites · 201483% earned
Rising· last 2 yrs
Assignees whose newest D21D patents became public in the last 2 years — the current frontier
- 199ANDRITZ INC62 patents · 393 citations
- 294INT PAPER CO16 patents · 164 citations
- 388AIKAWA TEKKO23 patents · 211 citations
- 481SEIKO EPSON CORP41 patents · 133 citations
- 575KIMBERLY CLARK CO5 patents · 76 citations
- 669VALMET OY32 patents · 85 citations
- 763VOITH PATENT GMBH19 patents · 25 citations
- 856KADANT LAMORT4 patents · 22 citations
- 950VALMET TECHNOLOGIES INC5 patents · 3 citations
- 1044KADANT BLACK CLAWSON LLC5 patents · 0 citations
- 1138AIKAWA FIBER TECH OY3 patents · 2 citations
- 1231JENNINGS JEFFREY LEIGH2 patents · 2 citations
- 1325FRISTAM PUMPS USA LP1 patents · 0 citations
- 1419GOLDCUP 33965 AB UNC HEJMAS AGRIFIBRE TECH AB1 patents · 0 citations
- 1513KURTZ GMBH & CO KG1 patents · 0 citations
- 166VALMET AB1 patents · 0 citations
- 171WRIGLEY W M JUN CO1 patents · 0 citations
Active· last 5 yrs
Sustained D21D output across the last 5 years
- 199ANDRITZ INC62 patents · 393 citations
- 296INT PAPER CO16 patents · 164 citations
- 392AIKAWA TEKKO23 patents · 211 citations
- 488PROCTER & GAMBLE8 patents · 141 citations
- 583SEIKO EPSON CORP41 patents · 133 citations
- 679ANDRITZ AG MASCHF23 patents · 124 citations
- 775KIMBERLY CLARK CO5 patents · 76 citations
- 871FIBERLEAN TECH LTD12 patents · 35 citations
- 967DOMTAR PAPER CO LLC8 patents · 44 citations
- 1063VALMET OY32 patents · 85 citations
- 1158VOITH PATENT GMBH19 patents · 25 citations
- 1254FPINNOVATIONS4 patents · 16 citations
- 1350ANDRITZ OY8 patents · 11 citations
- 1446KADANT LAMORT4 patents · 22 citations
- 1542WESTROCK MWV LLC4 patents · 10 citations
- 1638DAPROX AB6 patents · 6 citations
- 1733UNIV QILU TECHNOLOGY4 patents · 8 citations
- 1829VALMET TECHNOLOGIES OY14 patents · 3 citations
- 1925STORA ENSO OYJ6 patents · 3 citations
- 2021VALMET TECHNOLOGIES INC5 patents · 3 citations
- 2117PULMAC SYSTEMS INT INC4 patents · 3 citations
- 2213KADANT BLACK CLAWSON LLC5 patents · 0 citations
- 238AIKAWA FIBER TECH OY3 patents · 2 citations
- 244JENNINGS JEFFREY LEIGH2 patents · 2 citations
- 251SUZANO SA3 patents · 2 citations
All-time canon
All-time PatentIndex Score in D21D
- 199AHLSTROEM OY56 patents · 1,018 citations
- 296DURAMETAL CORP9 patents · 412 citations
- 392BELOIT TECHNOLOGIES INC25 patents · 600 citations
- 488KAMYR AB37 patents · 751 citations
- 583J & L FIBER SERVICES INC28 patents · 614 citations
- 679VOITH GMBH J M33 patents · 529 citations
- 775BLACK CLAWSON CO39 patents · 750 citations
- 871SUNDS DEFIBRATOR IND AB25 patents · 447 citations
- 967SPROUT BAUER INC ANDRITZ10 patents · 295 citations
- 1063BELOIT CORP40 patents · 753 citations
- 1158REINHALL ROLF BERTIL8 patents · 219 citations
- 1254ANDRITZ INC62 patents · 393 citations
- 1350WEYERHAEUSER CO10 patents · 234 citations
- 1446ESCHER WYSS GMBH24 patents · 427 citations
- 1542VOITH SULZER PAPER TECHNOLOGY9 patents · 235 citations
- 1638FIEDLER HEINRICH GMBH5 patents · 172 citations
- 1733LAMORT E & M16 patents · 279 citations
- 1829SUNDS DEFIBRATOR17 patents · 248 citations
- 1925INT PAPER CO16 patents · 164 citations
- 2021VALMET FIBERTECH AB23 patents · 264 citations
- 2117KAMYR INC14 patents · 194 citations
- 2213NORWALK IND COMPONENTS LLC5 patents · 114 citations
- 238SCA DEVELOPMENT AB7 patents · 145 citations
- 244FINCKH MASCHF15 patents · 256 citations
- 251INGERSOLL RAND CO13 patents · 185 citations
90–99 field-defining50–89 strong<50 emergingearned by citationsfrom family breadth