| 11976816 |
Method and apparatus for improved operation of chemical recovery boilers |
Daniel R. Higgins |
2024-05-07 |
| 11015800 |
Solid fuel burning-furnace having a vertically mounted cylindrical combustion chamber |
Daniel R. Higgins |
2021-05-25 |
| 10627105 |
Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification |
Daniel R. Higgins |
2020-04-21 |
| 10215398 |
Solid fuel burning-furnace having a vertically mounted cylindrical combustion chamber |
Daniel R. Higgins |
2019-02-26 |
| 9964303 |
Combustion boiler with pre-drying fuel chute |
Daniel R. Higgins |
2018-05-08 |
| 9581325 |
Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification |
Daniel R. Higgins |
2017-02-28 |
| 9581326 |
Power boiler having vertically mounted cylindrical combustion chamber |
Daniel R. Higgins |
2017-02-28 |
| 9140446 |
Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification |
Daniel R. Higgins |
2015-09-22 |
| 8707876 |
Stepped floor for solid fuel boilers |
Daniel R. Higgins |
2014-04-29 |
| D698945 |
Tile for a solid fuel boiler |
Daniel R. Higgins |
2014-02-04 |
| 8590463 |
Method and apparatus for drying solid fuels |
Daniel R. Higgins |
2013-11-26 |
| RE43733 |
Method and apparatus for improving boiler combustion |
Daniel R. Higgins |
2012-10-16 |
| 8276528 |
Pneumatic fuel distributor for solid fuel boilers |
Daniel R. Higgins |
2012-10-02 |
| 7185594 |
Method and apparatus for improving combustion in recovery boilers |
Daniel R. Higgins |
2007-03-06 |
| 6497230 |
Air port damper |
Daniel R. Higgins, Robert B. Hill |
2002-12-24 |
| 4934352 |
Surgical retractor handle construction |
— |
1990-06-19 |