Method for making a lignin component, a lignin component and its use and a product
US-10100157-B2 · Oct 16, 2018 · US
with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take precedence)}
with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take 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 | D21C3/04 |
| Official title | with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take precedence)} |
| Display label | with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take precedence)} |
| Total patents | 153 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is declining.
| Year | Patents |
|---|---|
| 2015 | 20 |
| 2016 | 21 |
| 2017 | 14 |
| 2018 | 12 |
| 2019 | 20 |
| 2020 | 11 |
| 2021 | 18 |
| 2022 | 7 |
| 2023 | 7 |
| 2024 | 9 |
| 2025 | 13 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Processes and apparatus for producing nanocellulose, and compositions and products produced therefrom
US-10093748-B2 · Oct 9, 2018 · US
Methods of producing a paper product
US-2018245285-A1 · Aug 30, 2018 · US
Method for reducing pulp viscosity in production of dissolving pulp
US-2018163344-A1 · Jun 14, 2018 · US
Methods of producing a paper product
US-9945073-B2 · Apr 17, 2018 · US
Nanocellulose-reinforced corrugated medium
US-2017328003-A1 · Nov 16, 2017 · US
Method for manufacturing recycled pulp from used sanitary article
US-2017305037-A1 · Oct 26, 2017 · US
Methods of producing a paper product
US-2017306557-A1 · Oct 26, 2017 · US
Liquefaction of biomass at low pH
US-9783565-B2 · Oct 10, 2017 · US
Treatment of biomass to dissolve lignin with ionic liquid composition
US-9765478-B2 · Sep 19, 2017 · US
Method for making a lignin component, a lignin component and its use and a product
US-2017247514-A1 · Aug 31, 2017 · US
Biomass treatment for hydrothermal hydrocatalytic conversion
US-9732469-B2 · Aug 15, 2017 · US
Method for pretreating cellulose pulp
US-9725849-B2 · Aug 8, 2017 · US
Method for preparing nanofibrillar cellulose
US-2017218567-A1 · Aug 3, 2017 · US
Processes and apparatus for producing nanocellulose, and compositions and products produced therefrom
US-2017210827-A1 · Jul 27, 2017 · US
Method for making a lignin component, a lignin component and its use and a product
US-9688824-B2 · Jun 27, 2017 · US
Methods of producing a paper product
US-9683329-B2 · Jun 20, 2017 · US
Biomass fractionation processes employing sulfur dioxide
US-9631316-B2 · Apr 25, 2017 · US
Method and a system for manufacturing cellulose material
US-9611586-B2 · Apr 4, 2017 · US
Hydrogen peroxide compositions for the delignification of plant matter, and uses thereof
US-2016326694-A1 · Nov 10, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C3/04?
- CPC D21C3/04 is the Cooperative Patent Classification code for “with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take precedence)}.”
- How many patents are filed under CPC D21C3/04 (with acids, acid salts or acid anhydrides {(D21C3/003 and D21C3/222 take precedence)})?
- Our database includes 153 publications tagged with this CPC code.
- Is patent activity under CPC D21C3/04 growing?
- Publication counts under this code: 9 in 2024 vs 13 in 2025 (latest complete years).