D21C 1/04
Pretreatment of the finely-divided materials before digesting: with acid reacting compounds
Official title: with acid reacting compounds
D21C1/04 (Pretreatment of the finely-divided materials before digesting: with acid reacting compounds) appears on 134 US grants and 180 published applications in this corpus.
Search patents in D21C- Granted patents
- 134
- Published applications
- 180
- Assignees
- 116
- Inventors
- 382
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 2 | 0 |
| 2002 | 1 | 2 |
| 2003 | 2 | 2 |
| 2004 | 1 | 1 |
| 2005 | 0 | 2 |
| 2006 | 0 | 3 |
| 2007 | 2 | 1 |
| 2008 | 2 | 5 |
| 2009 | 1 | 3 |
| 2010 | 1 | 4 |
| 2011 | 1 | 12 |
| 2012 | 6 | 9 |
| 2013 | 3 | 5 |
| 2014 | 4 | 8 |
| 2015 | 7 | 8 |
| 2016 | 9 | 8 |
| 2017 | 5 | 8 |
| 2018 | 8 | 13 |
| 2019 | 4 | 9 |
| 2020 | 6 | 9 |
| 2021 | 10 | 22 |
| 2022 | 8 | 15 |
| 2023 | 8 | 10 |
| 2024 | 17 | 11 |
| 2025 | 14 | 6 |
| 2026 | 3 | 4 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method and system for treating biomass8 Sep 2026US 12,729,483 B2Valmet Corporation
- Optimization of chemical consumption in biomass delignification4 Aug 2026US 12,698,589 B2Sixring Inc.
- Methods for producing pulp and paper products from plants having bast and hurd fibers3 Mar 2026US 12,565,735 B2Goldcup 33965 AB (Unc. Hejmas Agrifibre Technologies AB)
- Method for preparing unbleached biomechanical pulp from straws and full utilization of by-products14 Oct 2025US 12,442,134 B2Qilu University of Technology
- Methods of processing lignocellulosic biomass using single-stage autohydrolysis and enzymatic hydrolysis with C5 bypass and post-hydrolysis23 Sep 2025US 12,421,536 B2New Energy Blue LLC
- Method and system for treating biomass material6 Aug 2026US 2026/0226397 A1Valmet Corporation
- Methods for producing pulp and paper products from plants having bast and hurd fibers25 Jun 2026US 2026/0176819 A1Goldcup 33965 AB (Unc. Hejmas Agrifibre Technologies AB)
- Methods of processing lignocellulosic biomass using single-stage autohydrolysis and enzymatic hydrolysis with c5 bypass and post-hydrolysis15 Jan 2026US 2026/0015638 A1New Energy Blue LLC
- Processes and systems for biomass impregnation to improve conversion to sugars, chemicals, fuels, and materials8 Jan 2026US 2026/0009178 A1GranBio Intellectual Property Holdings, LLC
- Use of in-situ ionic liquid (il) and deep eutectic solvent (des) synthesis using chemically synthesized or biomass-derived ions in the pretreatment of biomass4 Dec 2025US 2025/0369183 A1National Technology & Engineering Solutions of Sandia, LLC
Most cited
By later US patents
- Alkaline peroxide mechanical pulping of non-woody species86US 6,258,207 B1Alberta Research Council · 2001
- Acid pre-hydrolysis reactor system60US 5,338,366 AKamyr, Inc. · 1994
- Method of countercurrent acid hydrolysis of comminuted cellulosic fibrous material56US 4,668,340 AKamyr, Inc. · 1987
- Method of continuous processing of lignocellulosic feedstock44US 7,754,457 B2Iogen Energy Corporation · 2010
- Production of low ash lignin35US 4,946,946 AImperial Chemical Industries PLC · 1990