D21C 1/06
Pretreatment of the finely-divided materials before digesting: with alkaline reacting compounds
Official title: with alkaline reacting compounds
D21C1/06 (Pretreatment of the finely-divided materials before digesting: with alkaline reacting compounds) appears on 96 US grants and 136 published applications in this corpus.
Search patents in D21C- Granted patents
- 96
- Published applications
- 136
- Assignees
- 94
- Inventors
- 299
- Latest grant
- 31 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 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 | 2 | 0 |
| 2000 | 2 | 0 |
| 2001 | 1 | 1 |
| 2002 | 1 | 1 |
| 2003 | 2 | 0 |
| 2004 | 1 | 2 |
| 2005 | 0 | 2 |
| 2006 | 0 | 3 |
| 2007 | 1 | 6 |
| 2008 | 1 | 2 |
| 2009 | 3 | 3 |
| 2010 | 2 | 7 |
| 2011 | 2 | 9 |
| 2012 | 5 | 11 |
| 2013 | 5 | 7 |
| 2014 | 5 | 6 |
| 2015 | 7 | 7 |
| 2016 | 5 | 4 |
| 2017 | 3 | 12 |
| 2018 | 6 | 2 |
| 2019 | 4 | 4 |
| 2020 | 2 | 6 |
| 2021 | 1 | 6 |
| 2022 | 3 | 8 |
| 2023 | 3 | 8 |
| 2024 | 6 | 3 |
| 2025 | 11 | 10 |
| 2026 | 1 | 6 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Paper pulp, a method for producing paper pulp, and paper pulp products31 Mar 2026US 12,590,411 B2ShenZhen YUTO Packaging Technology Co., Ltd.
- Method for co-producing molded food-container pulp and fulvic acid from cotton stalk16 Dec 2025US 12,497,734 B2
- Method for preparing biomechanical unbleached pulp from wheat straw and full utilization of by-products thereof28 Oct 2025US 12,454,792 B2Qilu University of Technology
- Preparation of cellulose fibers21 Oct 2025US 12,448,730 B2Jena Trading Aps
- Method for preparing unbleached biomechanical pulp from straws and full utilization of by-products14 Oct 2025US 12,442,134 B2Qilu University of Technology
- Pulp mixture6 Aug 2026US 2026/0226680 A1SöDra SkogsäGarna Ekonomisk FöRening
- Preparation of Maple Wood for CTMP Production30 Jul 2026US 2026/0218448 A1Billerud Aktiebolag (publ)
- Maple HT-CTMP30 Jul 2026US 2026/0218449 A1Billerud Aktiebolag (publ)
- Production of ctmp from a hardwood/softwood mixture23 Jul 2026US 2026/0210039 A1Billerud Aktiebolag (publ)
- Two-step impregnation in ht-ctmp production23 Jul 2026US 2026/0210040 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals96US 6,770,168 B1Kiram AB · 2004
- Combined physical and chemical treatment to improve lignocellulose digestibility48US 4,997,488 AThe United States of America as represented by the Secretary of Agriculture · 1991
- Modified kraft fibers37US 7,520,958 B2International Paper Company · 2009
- Biomass pretreatment process24US 8,168,840 B2KiOR, Inc. · 2012
- Chemithermomechanical pulping process employing separate alkali and sulfite treatments22US 4,486,267 AThe Mead Corporation · 1984