D21B 1/021
By chemical means
Official title: {by chemical means}
D21B1/021 (By chemical means) appears on 137 US grants and 130 published applications in this corpus.
Search patents in D21B- Granted patents
- 137
- Published applications
- 130
- Assignees
- 117
- Inventors
- 342
- Latest grant
- 7 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 2 | 0 |
| 1990 | 5 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 3 | 0 |
| 1994 | 2 | 0 |
| 1995 | 1 | 0 |
| 1996 | 6 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 3 | 0 |
| 2000 | 2 | 0 |
| 2001 | 0 | 1 |
| 2002 | 4 | 3 |
| 2003 | 1 | 2 |
| 2004 | 1 | 2 |
| 2005 | 1 | 3 |
| 2006 | 0 | 2 |
| 2007 | 1 | 1 |
| 2008 | 0 | 3 |
| 2009 | 0 | 4 |
| 2010 | 5 | 5 |
| 2011 | 2 | 2 |
| 2012 | 1 | 6 |
| 2013 | 3 | 5 |
| 2014 | 7 | 11 |
| 2015 | 7 | 6 |
| 2016 | 7 | 10 |
| 2017 | 12 | 9 |
| 2018 | 5 | 3 |
| 2019 | 2 | 8 |
| 2020 | 2 | 11 |
| 2021 | 4 | 9 |
| 2022 | 4 | 2 |
| 2023 | 8 | 5 |
| 2024 | 4 | 7 |
| 2025 | 3 | 3 |
| 2026 | 4 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Process for producing and using fibrillated biodegradable microfibers7 Jul 2026US 12,674,278 B2
- 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
- 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)
- Process for treating lignocellulosic biomass28 Oct 2025US 12,454,711 B2Agro Industries Recherche Et Developpement
- 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)
- Two-step impregnation in ht-ctmp production23 Jul 2026US 2026/0210040 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Process for pretreating particulate lignocellulosic material to remove heavy metals62US 4,599,138 AMooch Domsjo Aktiebolag · 1986
- Method and apparatus for mixing chemicals into fiber pulp48US 4,908,101 AHedemora AB · 1990
- Method for producing pulp using pre-treatment with stabilizers and refining40US 5,002,635 AScott Paper Company · 1991
- CTMP-process36US 5,607,546 AMolnlycke AB · 1997
- Method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a one-stage impregnation process34US 4,756,799 AEka AB · 1988