High yield chemical pulping and bleaching process
US-12435469-B2 · Oct 7, 2025 · US
with oxygen or its allotropic modifications (D21C9/16 takes precedence)
with oxygen or its allotropic modifications (D21C9/16 takes precedence) · Cooperative Patent Classification (CPC)
Textile and paper production, treatment, and products.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | D21C9/147 |
| Official title | with oxygen or its allotropic modifications (D21C9/16 takes precedence) |
| Display label | with oxygen or its allotropic modifications (D21C9/16 takes precedence) |
| Total patents | 55 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 9 |
| 2016 | 5 |
| 2017 | 7 |
| 2018 | 7 |
| 2019 | 4 |
| 2020 | 6 |
| 2021 | 3 |
| 2022 | 3 |
| 2023 | 4 |
| 2024 | 1 |
| 2025 | 6 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Treated Kraft pulp compositions and methods of making the same
US-12392086-B2 · Aug 19, 2025 · US
Fluff pulp
US-12297600-B2 · May 13, 2025 · US
Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby
US-12286750-B2 · Apr 29, 2025 · US
Oxygen treatment of high kappa fibers
US-12286751-B2 · Apr 29, 2025 · US
Method for distrubting chemicals in delignifiction stages of pulp bleaching process
US-2025122668-A1 · Apr 17, 2025 · US
Method for preparing fluff pulp from bamboos and fluff pulp prepared thereby
US-2024328083-A1 · Oct 3, 2024 · US
Crosslinked kraft pulp compositions and method
US-2023383467-A1 · Nov 30, 2023 · US
Short-sequence ecf bleaching process x/z/d-eop-d or x/d/z-eop-d for kraft wood pulp
US-2023349098-A1 · Nov 2, 2023 · US
High yield chemical pulping and bleaching process
US-2023265609-A1 · Aug 24, 2023 · US
Treated kraft pulp compositions and methods of making the same
US-2023142284-A1 · May 11, 2023 · US
Fluff pulp
US-2022290376-A1 · Sep 15, 2022 · US
Oxygen Treatment of High Kappa Fibers
US-2022213648-A1 · Jul 7, 2022 · US
Treated Kraft pulp compositions and methods of making the same
US-11332883-B2 · May 17, 2022 · US
Method for enhanced oxygen delignification of chemical wood pulps
US-11193237-B2 · Dec 7, 2021 · US
Bleaching and shive reduction for non-wood fibers
US-2021032801-A1 · Feb 4, 2021 · US
Bleaching and shive reduction process for non-wood fibers
US-2021032812-A1 · Feb 4, 2021 · US
Bleaching and shive reduction process for non-wood fibers
US-10844538-B2 · Nov 24, 2020 · US
Crosslinked cellulose as precursor in production of high-grade cellulose derivatives and related technology
US-10829892-B2 · Nov 10, 2020 · US
Bleaching and shive reduction process for non-wood fibers
US-2020332466-A1 · Oct 22, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C9/147?
- CPC D21C9/147 is the Cooperative Patent Classification code for “with oxygen or its allotropic modifications (D21C9/16 takes precedence).”
- How many patents are filed under CPC D21C9/147 (with oxygen or its allotropic modifications (D21C9/16 takes precedence))?
- Our database includes 55 publications tagged with this CPC code.
- Is patent activity under CPC D21C9/147 growing?
- Publication counts under this code: 1 in 2024 vs 6 in 2025 (latest complete years).