Pulp quality monitoring
US-2023287629-A1 · Sep 14, 2023 · US
Removal of fats, resins, pitch or waxes; {Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching (fats, waxes C11B; natural resins C09F1/00; hemicellulose C08B37/14; purification by mechanical means D21D5/00)}
Removal of fats, resins, pitch or waxes; {Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching (fats, waxes C11B; natural resins C09F1/00; hemicellulose C08B37/14; purification by mechanical means D21D5/00)} · 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 | D21C9/08 |
| Official title | Removal of fats, resins, pitch or waxes; {Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching (fats, waxes C11B; natural resins C09F1/00; hemicellulose C08B37/14; purification by mechanical means D21D5/00)} |
| Display label | Removal of fats, resins, pitch or waxes; {Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching (fats, waxes C11B; natural resins C09F1/00; hemicellulose C08B37/14; purification by mechanical means D21D5/00)} |
| Total patents | 72 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 8 |
| 2016 | 5 |
| 2017 | 7 |
| 2018 | 5 |
| 2019 | 9 |
| 2020 | 11 |
| 2021 | 4 |
| 2022 | 6 |
| 2023 | 6 |
| 2024 | 7 |
| 2025 | 4 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Pulp quality monitoring
US-11692312-B2 · Jul 4, 2023 · US
Method for controlling volatile fatty acid content in pulp, paper, and/or board making processes
US-2023193562-A1 · Jun 22, 2023 · US
Method of reducing hydrophobic contaminants in a pulping or papermaking process
US-2023071350-A1 · Mar 9, 2023 · US
Method for manufacturing a fibrous web
US-11598051-B2 · Mar 7, 2023 · US
Method for suppressing sedimentation of suspended substance, method for suppressing pitch trouble, and method for detecting sedimentation of suspended substance
US-2022325473-A1 · Oct 13, 2022 · US
Method of obtaining rayon fibers
US-11441264-B1 · Sep 13, 2022 · US
Use of a polymer product for deposit formation control in manufacture of paper or board
US-11441273-B2 · Sep 13, 2022 · US
Method for manufacturing bleached pulp, feedstock, and packaging system
US-2022267957-A1 · Aug 25, 2022 · US
Processes for biomass treatments
US-2022213276-A1 · Jul 7, 2022 · US
Composition of matter effluent from refiner of a wet laid process
US-11306433-B2 · Apr 19, 2022 · US
Use of a polymer product for deposit formation control in manufacture of paper or board
US-2021301473-A1 · Sep 30, 2021 · US
Pulp quality monitoring
US-2021156092-A1 · May 27, 2021 · US
Processes and systems for producing nanocellulose from old corrugated containers
US-2021148048-A1 · May 20, 2021 · US
Method of increasing efficiency of chemical additives in a papermarking systems
US-2021047780-A1 · Feb 18, 2021 · US
Pitch trouble prevention method
US-2020407921-A1 · Dec 31, 2020 · US
Method for Predicting or Controlling Microbial Status of a Paper or Board Making Process
US-2020299903-A1 · Sep 24, 2020 · US
Method of directed fouling of a substance onto a selected surface
US-10760213-B2 · Sep 1, 2020 · US
Processes and systems for producing nanocellulose from old corrugated containers
US-10753042-B2 · Aug 25, 2020 · US
Method for producing cellulose filaments with less refining energy
US-10683612-B2 · Jun 16, 2020 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C9/08?
- CPC D21C9/08 is the Cooperative Patent Classification code for “Removal of fats, resins, pitch or waxes; {Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching (fats, waxes C11B; natural resins C09F1/00; hemicellulose C08B37/14; purification by mechanical means D21D5/00)}.”
- How many patents are filed under CPC D21C9/08 (Removal of fats, resins, pitch or waxes; {Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching (fats, waxes C11B; natural resins C09F1/00; hemicellulose C08B37/14; purification by mechanical means D21D5/00)})?
- Our database includes 72 publications tagged with this CPC code.
- Is patent activity under CPC D21C9/08 growing?
- Publication counts under this code: 7 in 2024 vs 4 in 2025 (latest complete years).