Inventor · disambiguated record
Douglas W. Karkow
Also filed as: KARKOW DOUGLAS W · KARKOW DOUGLAS WAYNE
48 granted patents·30 pending applications·216 citations·filing 2013–2024
97Inventor score
Top patents by PatentIndex Score
78 records- 0199US9447965B2Burner with a perforated reaction holder and heating apparatusCLEARSIGN COMB CORP·Filed 2015·Granted Sep 20, 2016·31 cites·12 claims
- 0299US9388981B2Method for flame location transition from a start-up location to a perforated flame holderCLEARSIGN COMB CORP·Filed 2015·Granted Jul 12, 2016·51 cites·18 claims
- 0399US9377190B2Burner with a perforated flame holder and pre-heat apparatusCLEARSIGN COMB CORP·Filed 2015·Granted Jun 28, 2016·55 cites·16 claims
- 0498US9562682B2Burner with a series of fuel gas ejectors and a perforated flame holderCLEARSIGN COMB CORP·Filed 2015·Granted Feb 7, 2017·14 cites·20 claims
- 0596US9885496B2Fluid heater with perforated flame holderCLEARSIGN COMB CORP·Filed 2015·Granted Feb 6, 2018·5 cites·16 claims
- 0696US9797595B2Fuel combustion system with a perforated reaction holderCLEARSIGN COMB CORP·Filed 2014·Granted Oct 24, 2017·10 cites·54 claims
- 0793US10088153B2Radiant wall burner including perforated flame holdersCLEARSIGN COMB CORP·Filed 2016·Granted Oct 2, 2018·3 cites·15 claims
- 0892US10088154B2Down-fired burner with a perforated flame holderCLEARSIGN COMB CORP·Filed 2016·Granted Oct 2, 2018·3 cites·43 claims
- 0992US9828288B2Perforated burner for a rotary kilnCLEARSIGN COMB CORP·Filed 2015·Granted Nov 28, 2017·5 cites·18 claims
- 1091US10077899B2Startup method and mechanism for a burner having a perforated flame holderCLEARSIGN COMB CORP·Filed 2014·Granted Sep 18, 2018·5 cites·8 claims
- 1191US10066835B2Combustion system with flame location actuationCLEARSIGN COMB CORP·Filed 2014·Granted Sep 4, 2018·8 cites·33 claims
- 1291US10006715B2Tunnel burner including a perforated flame holderCLEARSIGN COMB CORP·Filed 2016·Granted Jun 26, 2018·4 cites·34 claims
- 1387US10337729B2Fuel combustion system with a perforated reaction holderCLEARSIGN COMB CORP·Filed 2017·Granted Jul 2, 2019·1 cites·8 claims
- 1486US11313553B2Plug and play burnerCLEARSIGN COMB CORP·Filed 2018·Granted Apr 26, 2022·4 cites·32 claims
- 1586US10808927B2Pre-mixed fuel burner with perforated flame holderCLEARSIGN COMB CORP·Filed 2016·Granted Oct 20, 2020·2 cites·25 claims
- 1685US9791171B2Fluid heater with a variable-output burner including a perforated flame holder and method of operationCLEARSIGN COMB CORP·Filed 2015·Granted Oct 17, 2017·2 cites·42 claims
- 1785US2025093024A1Burner system including a distal flame holder and a non-reactive fluid sourceCLEARSIGN TECH CORPORATION·Filed 2024·Application pending·0 cites
- 1882US9857076B2Perforated flame holder and burner including a perforated flame holderCLEARSIGN COMB CORP·Filed 2014·Granted Jan 2, 2018·4 cites·34 claims
- 1980US9803855B2Selectable dilution low NOx burnerCLEARSIGN COMB CORP·Filed 2014·Granted Oct 31, 2017·4 cites·44 claims
- 2079US11156356B2Fuel combustion system with a perforated reaction holderCLEARSIGN COMB CORP·Filed 2019·Granted Oct 26, 2021·0 cites·20 claims
- 2178US11953199B2Burner and burner system with flange mountCLEARSIGN TECH CORPORATION·Filed 2022·Granted Apr 9, 2024·0 cites·38 claims
- 2278US10156356B2Flame visualization control for a burner including a perforated flame holderCLEARSIGN COMB CORP·Filed 2016·Granted Dec 18, 2018·1 cites·19 claims
- 2374US11248786B2Method for a perforated flame holder with adjustable fuel nozzleCLEARSIGN TECH CORPORATION·Filed 2019·Granted Feb 15, 2022·0 cites·11 claims
- 2473US10539326B2Duplex burner with velocity-compensated mesh and thicknessCLEARSIGN COMB CORP·Filed 2017·Granted Jan 21, 2020·1 cites·26 claims
- 2573US2019003705A1Startup method and mechanism for a burner having a perforated flame holderCLEARSIGN COMB CORP·Filed 2018·Application pending·0 cites
- 2670US10240788B2Combustion system with flame location actuationCLEARSIGN COMB CORP·Filed 2018·Granted Mar 26, 2019·0 cites·24 claims
- 2769US11047572B2Porous flame holder for low NOx combustionCLEARSIGN COMB CORP·Filed 2014·Granted Jun 29, 2021·1 cites·30 claims
- 2868US10823401B2Burner system including a non-planar perforated flame holderCLEARSIGN TECH CORPORATION·Filed 2018·Granted Nov 3, 2020·0 cites·50 claims
- 2967US10760784B2Burner including a perforated flame holder spaced away from a fuel nozzleCLEARSIGN TECH CORPORATION·Filed 2017·Granted Sep 1, 2020·0 cites·44 claims
- 3067US10139131B2Fluid heater with perforated flame holder, and method of operationCLEARSIGN COMB CORP·Filed 2017·Granted Nov 27, 2018·0 cites·10 claims
- 3166US12066248B2Burner system including a plurality of perforated flame holdersCLEARSIGN TECH CORPORATION·Filed 2020·Granted Aug 20, 2024·0 cites·50 claims
- 3266US2019011124A1Radiant wall burner including perforated flame holdersCLEARSIGN COMB CORP·Filed 2018·Application pending·0 cites
- 3365US10190767B2Electrically controlled combustion fluid flowCLEARSIGN COMB CORP·Filed 2014·Granted Jan 29, 2019·1 cites·23 claims
- 3465US10125979B2Combustion system and method for electrically assisted start-upCLEARSIGN COMB CORP·Filed 2014·Granted Nov 13, 2018·1 cites·45 claims
- 3564US10808925B2Method for electrically controlled combustion fluid flowCLEARSIGN COMB CORP·Filed 2018·Granted Oct 20, 2020·0 cites·13 claims
- 3663US10578301B2Perforated flame holder with adjustable fuel nozzleCLEARSIGN TECH CORPORATION·Filed 2017·Granted Mar 3, 2020·0 cites·33 claims
- 3763US10119704B2Burner system including a non-planar perforated flame holderCLEARSIGN COMB CORP·Filed 2016·Granted Nov 6, 2018·0 cites·56 claims
- 3862US12359804B2Burner system with discrete transverse flame stabilizersCLEARSIGN TECH CORPORATION·Filed 2022·Granted Jul 15, 2025·0 cites·44 claims
- 3962US2016161115A1Burner with electrodynamic flame position control systemCLEARSIGN COMB CORP·Filed 2013·Application pending·0 cites
- 4060US11221137B2Field installed perforated flame holder and method of assembly and installationCLEARSIGN COMB CORP·Filed 2019·Granted Jan 11, 2022·0 cites·48 claims
- 4159US2021190310A9Burner system including a distal flame holder and a non-reactive fluid sourceCLEARSIGN TECH CORPORATION·Filed 2020·Application pending·0 cites
- 4258US10571124B2Selectable dilution low NOx burnerCLEARSIGN COMB CORP·Filed 2017·Granted Feb 25, 2020·0 cites·62 claims
- 4357US11953201B2Control system and method for a burner with a distal flame holderCLEARSIGN TECH CORPORATION·Filed 2020·Granted Apr 9, 2024·0 cites·47 claims
- 4457US11435143B2Burner system with discrete transverse flame stabilizersCLEARSIGN TECH CORPORATION·Filed 2018·Granted Sep 6, 2022·0 cites·36 claims
- 4557US10386062B2Method for operating a combustion system including a perforated flame holderCLEARSIGN COMB CORP·Filed 2016·Granted Aug 20, 2019·0 cites·37 claims
- 4657US10125983B2High output porous tile burnerCLEARSIGN COMB CORP·Filed 2016·Granted Nov 13, 2018·0 cites·18 claims
- 4756US11460188B2Ultra low emissions firetube boiler burnerCLEARSIGN TECH CORPORATION·Filed 2019·Granted Oct 4, 2022·0 cites·19 claims
- 4856US10551058B2Multi-nozzle combustion assemblies including perforated flame holder, combustion systems including the combustion assemblies, and related methodsCLEARSIGN COMB CORP·Filed 2017·Granted Feb 4, 2020·0 cites·26 claims
- 4956US2015079524A1LIFTED FLAME LOW NOx BURNER WITH FLAME POSITION CONTROLCLEARSIGN COMB CORP·Filed 2013·Application pending·0 cites
- 5054US10514165B2Perforated flame holder and system including protection from abrasive or corrosive fuelCLEARSIGN COMB CORP·Filed 2017·Granted Dec 24, 2019·0 cites·33 claims
Showing the top 50 of 78 patent records by PatentIndex Score.
Join the waitlist — get patent alerts
Get an alert when Douglas W. Karkow files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →