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USPTO Patent Rankings Data through Dec 31, 2025
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Daniel J. Despen — 39 Patents

CACarbon: 33 patents #4 of 29Top 15%
Oakdale, MN: #10 of 368 inventorsTop 3%
Minnesota: #1,357 of 52,454 inventorsTop 3%
Overall (All Time): #81,245 of 4,157,543Top 2%
39 Patents All Time
Daniel J. Despen has been granted 39 US patents. The first was granted in 2014 and the most recent in December 2025. Daniel J. Despen ranks #81,245 of 4,157,543 US inventors in our database (top 2.0%). Patent records list Daniel J. Despen in Oakdale, MN, US.

Patents per Year

Patents granted per year, 2014 to 2025Bar chart with a peak of 12 patents in 2025.peak 122014: 1 patents20142016: 3 patents20162017: 3 patents20172019: 2 patents20192020: 1 patents20202021: 3 patents20212022: 7 patents20222023: 1 patents20232024: 6 patents20242025: 12 patents2025

Issued Patents All Time

Showing 1–25 of 39 patents

Patent #TitleCo-InventorsDate
12497570 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2025-12-16
12441947 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2025-10-14
12404472 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2025-09-02
12404471 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2025-09-02
12350648 Methods and apparatus for producing activated carbon from biomass through carbonized ash intermediates James A. Mennell, David Reamer 2025-07-08
12351770 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2025-07-08
12297398 Methods and apparatus for enhancing the energy content of carbonaceous materials from pyrolysis James A. Mennell 2025-05-13
12297399 Process for producing high-carbon biogenic reagents James A. Mennell 2025-05-13
12296316 Highly mesoporous activated carbon James A. Mennell, David Reamer 2025-05-13
12239953 Biogenic porous carbon silicon dioxide compositions James A. Mennell, Dustin Slack 2025-03-04
12208368 Halogenated activated carbon compositions and methods of making and using same James A. Mennell 2025-01-28
12208369 Halogenated activated carbon compositions and methods of making and using same James A. Mennell 2025-01-28
12151226 Biogenic activated carbon and methods of making and using same James A. Mennell 2024-11-26
12084623 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2024-09-10
11965139 Systems and apparatus for production of high-carbon biogenic reagents James A. Mennell 2024-04-23
11959038 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2024-04-16
11891582 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2024-02-06
11879107 High-carbon biogenic reagents and uses thereof James A. Mennell, Steve Filips 2024-01-23
11674101 Process for producing high-carbon biogenic reagents James A. Mennell 2023-06-13
11458452 Highly mesoporous activated carbon James A. Mennell, David Reamer 2022-10-04
11413601 Halogenated activated carbon compositions and methods of making and using same James A. Mennell 2022-08-16
11358119 Carbon micro-plant James A. Mennell, David Reamer 2022-06-14
11359154 Systems and apparatus for production of high-carbon biogenic reagents James A. Mennell 2022-06-14
11285454 Biogenic activated carbon and methods of making and using same James A. Mennell 2022-03-29
11286440 Methods and apparatus for enhancing the energy content of carbonaceous materials from pyrolysis James A. Mennell 2022-03-29

Frequent Collaborators

James A. Mennell39 shared
Steve Filips12 shared
David Reamer7 shared
Dustin Slack1 shared

Nearby-Ranked Inventors

Andre M. J. Boule39
Ga Young An39
Jong-Heon Yang39
Kenta OGATA39
Dongwon Seo39
Darshan R. Kasar39
Daniel Braunstein39
Katharine Geramita39
Yoichi Katsumoto39