Methods of producing a paper product
US-2017306557-A1 · Oct 26, 2017 · US
with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
with inorganic bases or alkaline reacting compounds, e.g. sulfate processes · 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 | D21C3/02 |
| Official title | with inorganic bases or alkaline reacting compounds, e.g. sulfate processes |
| Display label | with inorganic bases or alkaline reacting compounds, e.g. sulfate processes |
| Total patents | 193 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is growing.
| Year | Patents |
|---|---|
| 2015 | 28 |
| 2016 | 20 |
| 2017 | 18 |
| 2018 | 13 |
| 2019 | 13 |
| 2020 | 10 |
| 2021 | 18 |
| 2022 | 16 |
| 2023 | 10 |
| 2024 | 18 |
| 2025 | 24 |
| 2026 | 5 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method of processing and fractionating biomass and use of fractions thus obtained
US-2017298152-A1 · Oct 19, 2017 · US
Preparation of lactic acid and/or a lactate salt from lignocellulosic material by separate saccharification and fermentation steps
US-2017292133-A1 · Oct 12, 2017 · US
Production of Cellulose Nanocrystals From Raw Wood Via Hydrothermal Treatment
US-2017260692-A1 · Sep 14, 2017 · US
Biomass treatment for hydrothermal hydrocatalytic conversion
US-9732469-B2 · Aug 15, 2017 · US
Processes for producing cellulose pulp and pulp-derived products from lignocellulosic biomass
US-2017204563-A1 · Jul 20, 2017 · US
Method for manufacturing monosaccharides, oligosaccharides, and furfurals from biomass
US-9708356-B2 · Jul 18, 2017 · US
Method and apparatus for pumping sawdust feed in a sawdust pulping system
US-2017175328-A1 · Jun 22, 2017 · US
Methods of producing a paper product
US-9683329-B2 · Jun 20, 2017 · US
Method and a system for manufacturing cellulose material
US-9611586-B2 · Apr 4, 2017 · US
Processes for producing cellulose pulp and pulp-derived products from lignocellulosic biomass
US-9556557-B2 · Jan 31, 2017 · US
Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in papermaking
US-2017009399-A1 · Jan 12, 2017 · US
Cellulose solution manufacturing method, cellulose precipitate manufacturing method, cellulose saccharification method, cellulose solution, and cellulose precipitate
US-9522991-B2 · Dec 20, 2016 · US
Method of improving dewatering efficiency, increasing sheet wet web strength, increasing sheet wet strength and enhancing filler retention in papermaking
US-9487916-B2 · Nov 8, 2016 · US
Biomass treatment for hydrothermal hydrocatalytic conversion
US-2016298292-A1 · Oct 13, 2016 · US
Nanocellulose
US-2016289893-A1 · Oct 6, 2016 · US
Cross-linked glycerol based polymers as digestion aids for improving wood pulping processes
US-9416490-B2 · Aug 16, 2016 · US
Method for producing microcrystalline cellulose from tobacco and related tobacco product
US-2016227834-A1 · Aug 11, 2016 · US
Processes for producing cellulose pulp and pulp-derived products from lignocellulosic biomass
US-2016222586-A1 · Aug 4, 2016 · US
Cross-linked glycerol based polymers as digestion aids for improving wood pulping processes
US-2016215449-A9 · Jul 28, 2016 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC D21C3/02?
- CPC D21C3/02 is the Cooperative Patent Classification code for “with inorganic bases or alkaline reacting compounds, e.g. sulfate processes.”
- How many patents are filed under CPC D21C3/02 (with inorganic bases or alkaline reacting compounds, e.g. sulfate processes)?
- Our database includes 193 publications tagged with this CPC code.
- Is patent activity under CPC D21C3/02 growing?
- Publication counts under this code: 18 in 2024 vs 24 in 2025 (latest complete years).