System for decolorization of material comprising cellulose
US-2025283276-A1 · Sep 11, 2025 · US
with per compounds
with per compounds · 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 | D21C9/16 |
| Official title | with per compounds |
| Display label | with per compounds |
| Total patents | 59 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 4 |
| 2016 | 3 |
| 2017 | 3 |
| 2018 | 4 |
| 2019 | 3 |
| 2020 | 5 |
| 2021 | 9 |
| 2022 | 4 |
| 2023 | 8 |
| 2024 | 7 |
| 2025 | 9 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
High brightness non-wood pulp
US-2025146219-A1 · May 8, 2025 · US
Method for distrubting chemicals in delignifiction stages of pulp bleaching process
US-2025122668-A1 · Apr 17, 2025 · US
Bleaching Trichomes to Remove Proteins
US-2025116064-A1 · Apr 10, 2025 · US
Dispersible non-wood pulp
US-2025116065-A1 · Apr 10, 2025 · US
High brightness non-wood pulp
US-12227900-B2 · Feb 18, 2025 · US
Bleaching trichomes to remove proteins
US-12215461-B2 · Feb 4, 2025 · US
Dispersible non-wood pulp
US-12215464-B2 · Feb 4, 2025 · US
Non-wood pulp having high brightness and low debris
US-2025012010-A1 · Jan 9, 2025 · US
High porosity non-wood pulp
US-2024392505-A1 · Nov 28, 2024 · US
Non-wood pulp having high brightness and low debris
US-12146262-B2 · Nov 19, 2024 · US
High porosity non-wood pulp
US-12098507-B2 · Sep 24, 2024 · US
Bleaching Trichomes to Remove Proteins
US-2024052567-A1 · Feb 15, 2024 · US
Non-wood pulp having high brightness and low debris
US-2024018723-A1 · Jan 18, 2024 · US
High porosity non-wood pulp
US-2024011223-A1 · Jan 11, 2024 · US
Dispersible non-wood pulp
US-2024003087-A1 · Jan 4, 2024 · US
High brightness non-wood pulp
US-2023407562-A1 · Dec 21, 2023 · US
Bleaching trichomes to remove proteins
US-11846068-B2 · Dec 19, 2023 · US
High efficiency fiber bleaching process
US-11840805-B2 · Dec 12, 2023 · US
Enhanced peroxygen stability in multi-dispense TAED-containing peroxygen solid
US-11731889-B2 · Aug 22, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C9/16?
- CPC D21C9/16 is the Cooperative Patent Classification code for “with per compounds.”
- How many patents are filed under CPC D21C9/16 (with per compounds)?
- Our database includes 59 publications tagged with this CPC code.
- Is patent activity under CPC D21C9/16 growing?
- Publication counts under this code: 7 in 2024 vs 9 in 2025 (latest complete years).