D21B 1/02
Pretreatment of the raw materials by chemical or physical means
Official title: Pretreatment of the raw materials by chemical or physical means (removal of bark B27L)
D21B1/02 (Pretreatment of the raw materials by chemical or physical means) appears on 480 US grants and 336 published applications in this corpus.
Search patents in D21B- Granted patents
- 480
- Published applications
- 336
- Assignees
- 268
- Inventors
- 818
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 7 | 0 |
| 1978 | 4 | 0 |
| 1979 | 6 | 0 |
| 1980 | 13 | 0 |
| 1981 | 10 | 0 |
| 1982 | 2 | 0 |
| 1983 | 5 | 0 |
| 1984 | 7 | 0 |
| 1985 | 5 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 9 | 0 |
| 1989 | 8 | 0 |
| 1990 | 15 | 0 |
| 1991 | 9 | 0 |
| 1992 | 13 | 0 |
| 1993 | 13 | 0 |
| 1994 | 15 | 0 |
| 1995 | 16 | 0 |
| 1996 | 18 | 0 |
| 1997 | 9 | 0 |
| 1998 | 10 | 0 |
| 1999 | 18 | 0 |
| 2000 | 11 | 0 |
| 2001 | 13 | 1 |
| 2002 | 9 | 9 |
| 2003 | 4 | 7 |
| 2004 | 7 | 9 |
| 2005 | 4 | 4 |
| 2006 | 2 | 9 |
| 2007 | 4 | 8 |
| 2008 | 1 | 10 |
| 2009 | 1 | 7 |
| 2010 | 9 | 9 |
| 2011 | 5 | 6 |
| 2012 | 2 | 7 |
| 2013 | 6 | 11 |
| 2014 | 12 | 17 |
| 2015 | 14 | 18 |
| 2016 | 17 | 24 |
| 2017 | 22 | 21 |
| 2018 | 10 | 22 |
| 2019 | 15 | 21 |
| 2020 | 13 | 24 |
| 2021 | 12 | 18 |
| 2022 | 11 | 8 |
| 2023 | 15 | 20 |
| 2024 | 11 | 21 |
| 2025 | 15 | 13 |
| 2026 | 9 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process for producing and using fibrillated biodegradable microfibers7 Jul 2026US 12,674,278 B2
- Hygromorphic composite material16 Jun 2026US 12,655,582 B2Nanyang Technological University
- Separation device and sheet manufacturing apparatus12 May 2026US 12,624,499 B2Seiko Epson Corporation
- Lignocellulosic bioplastics and composites, and methods for forming and use thereof12 May 2026US 12,624,502 B2University of Maryland, College Park
- Method and processing system for reducing volatile organic compounds from wood chips21 Apr 2026US 12,606,954 B2Fiberboard GmbH
- Compostable sleeve apparatus and method of manufacture17 Sep 2026US 2026/0274549 A1
- Preparation of Maple Wood for CTMP Production30 Jul 2026US 2026/0218448 A1Billerud Aktiebolag (publ)
- Maple HT-CTMP30 Jul 2026US 2026/0218449 A1Billerud Aktiebolag (publ)
- HT-CTMP Formed from a Maple Wood/Softwood Mixture30 Jul 2026US 2026/0218453 A1Billerud Aktiebolag (publ)
- Production of ctmp from a hardwood/softwood mixture23 Jul 2026US 2026/0210039 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Materials size reduction systems and process73US 6,045,070 A2000
- Paper products and methods and systems for manufacturing such products66US 7,867,358 B2Xyleco, Inc. · 2011
- Process for pretreating particulate lignocellulosic material to remove heavy metals62US 4,599,138 AMooch Domsjo Aktiebolag · 1986
- Method for recycling plastic coated paper product waste and polymeric film52US 5,277,758 AAdvanced Environmental Recycling Technologies, Inc. · 1994
- Process and apparatus for the recovery of cellulose fibers from paper-plastic mixtures51US 4,440,635 A1984