Method for preparing biomechanical unbleached pulp from wheat straw and full utilization of by-products thereof
US-12454792-B2 · Oct 28, 2025 · US
in the presence of chemical agents
in the presence of chemical agents · 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 | D21B1/16 |
| Official title | in the presence of chemical agents |
| Display label | in the presence of chemical agents |
| Total patents | 30 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is rapidly declining.
| Year | Patents |
|---|---|
| 2015 | 1 |
| 2016 | 3 |
| 2017 | 1 |
| 2018 | 3 |
| 2019 | 3 |
| 2020 | 1 |
| 2021 | 6 |
| 2022 | 5 |
| 2023 | 3 |
| 2024 | 2 |
| 2025 | 2 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for preparing unbleached biomechanical pulp from straws and full utilization of by-products
US-12442134-B2 · Oct 14, 2025 · US
Method of making fire retardant materials and related products
US-2024191430-A1 · Jun 13, 2024 · US
Method for producing softwood-derived pulp fibers for paper and softwood-derived pulp fibers for paper
US-11879210-B2 · Jan 23, 2024 · US
Method for preparing unbleached biomechanical pulp and fully utilizing by-products by treating straws with heat steam in synergy with biological enzyme
US-11834784-B2 · Dec 5, 2023 · US
Method for preparing unbleached biomechanical pulp from straw
US-11624154-B2 · Apr 11, 2023 · US
Method of increasing the throughput and/or decreasing energy usage of a pulping process
US-11624153-B2 · Apr 11, 2023 · US
Method for dissolving lignocellulosic biomass
US-11492737-B1 · Nov 8, 2022 · US
Method for preparing biomechanical unbleached pulp from wheat straw and full utilization of by-products thereof
US-2022205177-A1 · Jun 30, 2022 · US
Method for preparing unbleached biomechanical pulp from straws and full utilization of by-products
US-2022205179-A1 · Jun 30, 2022 · US
Method for preparing unbleached biomechanical pulp and fully utilizing by-products by treating straws with heat steam in synergy with biological enzyme
US-2022205178-A1 · Jun 30, 2022 · US
Method for producing softwood-derived pulp fibers for paper and softwood-derived pulp fibers for paper
US-2022074138-A1 · Mar 10, 2022 · US
Process for the production of nano-fibrillar cellulose suspensions
US-2021262164-A1 · Aug 26, 2021 · US
Method for producing cellulose nanofiber dry solid
US-10988549-B2 · Apr 27, 2021 · US
Process for the production of nano-fibrillar cellulose suspensions
US-10982387-B2 · Apr 20, 2021 · US
Fiber blend having high yield and enhanced pulp performance and method for making same
US-10975520-B2 · Apr 13, 2021 · US
Method for improved production of fermentable sugars from lignocellulosic biomass using additive and enzyme
US-10968322-B2 · Apr 6, 2021 · US
Method for preparing unbleached biomechanical pulp from straw
US-2021054566-A1 · Feb 25, 2021 · US
Method of increasing the throughput and/or decreasing energy usage of a pulping process
US-2020123707-A1 · Apr 23, 2020 · US
Additive composition for improved production of fermentable sugars from lignocellulosic biomass
US-2019248962-A1 · Aug 15, 2019 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21B1/16?
- CPC D21B1/16 is the Cooperative Patent Classification code for “in the presence of chemical agents.”
- How many patents are filed under CPC D21B1/16 (in the presence of chemical agents)?
- Our database includes 30 publications tagged with this CPC code.
- Is patent activity under CPC D21B1/16 growing?
- Publication counts under this code: 2 in 2024 vs 2 in 2025 (latest complete years).