D21C 3/003
Pulping cellulose-containing materials: with organic compounds
Official title: {with organic compounds (D21C3/20 and D21C3/222 take precedence)}
D21C3/003 (Pulping cellulose-containing materials: with organic compounds) appears on 88 US grants and 107 published applications in this corpus.
Search patents in D21C- Granted patents
- 88
- Published applications
- 107
- Assignees
- 74
- Inventors
- 242
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 2 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 2 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 3 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 1 | 0 |
| 2004 | 0 | 1 |
| 2005 | 0 | 0 |
| 2006 | 1 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 1 |
| 2010 | 0 | 3 |
| 2011 | 2 | 2 |
| 2012 | 1 | 2 |
| 2013 | 4 | 1 |
| 2014 | 0 | 8 |
| 2015 | 2 | 9 |
| 2016 | 1 | 4 |
| 2017 | 3 | 6 |
| 2018 | 2 | 4 |
| 2019 | 4 | 8 |
| 2020 | 2 | 3 |
| 2021 | 4 | 8 |
| 2022 | 4 | 18 |
| 2023 | 7 | 8 |
| 2024 | 13 | 9 |
| 2025 | 13 | 9 |
| 2026 | 4 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Processes for fractionation of biomass4 Aug 2026US 12,698,590 B2The Board of Trustees of The University of Alabama
- Approach to biomass delignification28 Jul 2026US 12,692,653 B2Sixring Inc.
- Extraction of delignified, cellulose-based fibers from natural plant material, and materials incorporating such fibers12 May 2026US 12,624,500 B2University of Maryland, College Park
- Foam-based manufacturing system and process14 Apr 2026US 12,601,113 B2Kimberly-Clark Worldwide, Inc.
- Evaporative devices having delignified plant materials, and systems and methods for fabrication and use thereof30 Dec 2025US 12,509,822 B2University of Maryland, College Park
- Foam-Based Manufacturing System and Process6 Aug 2026US 2026/0226679 A1Kimberly-Clark Worldwide, Inc.
- Foam-Based Manufacturing System and Process23 Jul 2026US 2026/0210038 A1Kimberly-Clark Worldwide, Inc.
- Extraction of delignified, cellulose-based fibers from natural plant material, and materials incorporating such fibers26 Feb 2026US 2026/0055552 A1University of Maryland, College Park
- Method for producing pulp softeners using waste cooking oil6 Nov 2025US 2025/0341053 A1Chengdu Huadian Rongyu Biotechnology Co., Ltd
- Efficient methods and compositions for recovery of products from organic acid pretreatment of plant materials6 Nov 2025US 2025/0341054 A1Pierson Capital Environmental (Beijing) Limited
Most cited
By later US patents
- Porphyrins97US 4,892,941 A1990
- Production of pulp by the soda-anthraquinone process (SAP) with recovery of the cooking chemicals77US 5,595,628 AGrant S.A. · 1997
- Process for bleaching organic peroxyacid cooked material with an alkaline solution of hydrogen peroxide73US 4,793,898 AOy Keskuslaboratorio-Centrallaboratorium AB · 1988
- Method of producing pulp using single-stage cooking with formic acid and washing with performic acid56US 6,156,156 AChempolis Oy · 2000
- Method for the simultaneous delignification of wood and other ligno-cellulosic materials and hydrolysis of the hemicellulose component thereof35US 4,511,433 ABattelle Memorial Institute · 1985