D21B 1/04
Fibrous raw materials or their mechanical treatment: by dividing raw materials into
Official title: by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B27L; mechanical separation of fibres from plant material D01B1/00; hackling or heckling machines D01B5/00)
D21B1/04 (Fibrous raw materials or their mechanical treatment: by dividing raw materials into) appears on 1,244 US grants and 934 published applications in this corpus.
Search patents in D21B- Granted patents
- 1,244
- Published applications
- 934
- Assignees
- 558
- Inventors
- 1,966
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 17 | 0 |
| 1977 | 14 | 0 |
| 1978 | 9 | 0 |
| 1979 | 17 | 0 |
| 1980 | 34 | 0 |
| 1981 | 29 | 0 |
| 1982 | 18 | 0 |
| 1983 | 28 | 0 |
| 1984 | 19 | 0 |
| 1985 | 13 | 0 |
| 1986 | 24 | 0 |
| 1987 | 22 | 0 |
| 1988 | 26 | 0 |
| 1989 | 19 | 0 |
| 1990 | 19 | 0 |
| 1991 | 22 | 0 |
| 1992 | 22 | 0 |
| 1993 | 22 | 0 |
| 1994 | 26 | 0 |
| 1995 | 20 | 0 |
| 1996 | 26 | 0 |
| 1997 | 27 | 0 |
| 1998 | 30 | 0 |
| 1999 | 25 | 0 |
| 2000 | 23 | 0 |
| 2001 | 33 | 13 |
| 2002 | 27 | 20 |
| 2003 | 17 | 22 |
| 2004 | 9 | 37 |
| 2005 | 14 | 29 |
| 2006 | 11 | 26 |
| 2007 | 24 | 25 |
| 2008 | 11 | 35 |
| 2009 | 17 | 20 |
| 2010 | 18 | 38 |
| 2011 | 20 | 26 |
| 2012 | 27 | 37 |
| 2013 | 26 | 50 |
| 2014 | 36 | 32 |
| 2015 | 41 | 35 |
| 2016 | 24 | 48 |
| 2017 | 25 | 48 |
| 2018 | 28 | 41 |
| 2019 | 39 | 64 |
| 2020 | 38 | 60 |
| 2021 | 54 | 48 |
| 2022 | 39 | 33 |
| 2023 | 31 | 43 |
| 2024 | 31 | 48 |
| 2025 | 33 | 40 |
| 2026 | 20 | 16 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Method for producing a biofuel by steam cracking18 Aug 2026US 12,709,715 B2Europeenne De Biomasse
- Sheet manufacturing apparatus21 Jul 2026US 12,686,969 B2Seiko Epson Corporation
- Recycling of lignocellulosic fibers from fiberboards21 Jul 2026US 12,686,970 B2Inter IKEA Systems B.V.
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials14 Jul 2026US 12,678,759 B2Circ, LLC
- Process for producing and using fibrillated biodegradable microfibers7 Jul 2026US 12,674,278 B2
- A mill for an air-formed cellulose blank product and method for using the same17 Sep 2026US 2026/0273540 A1PulPac AB
- Process and System for Producing Pulp, Energy, and Bioderivatives from Plant-Based and Recycled Materials10 Sep 2026US 2026/0264040 A1Circ, LLC
- Method and device for producing a fibrous web20 Aug 2026US 2026/0243021 A1Andritz Kuesters GmbH
- Preparation of Maple Wood for CTMP Production30 Jul 2026US 2026/0218448 A1Billerud Aktiebolag (publ)
- Maple HT-CTMP30 Jul 2026US 2026/0218449 A1Billerud Aktiebolag (publ)
Most cited
By later US patents
- Microfibrillated cellulose207US 4,374,702 AInternational Telephone and Telegraph Corporation · 1983
- Method for increasing the accessibility of cellulose in lignocellulosic materials, particularly hardwoods agricultural residues and the like177US 4,461,648 A1984
- Processing biomass176US 7,932,065 B2Xyleco, Inc. · 2011
- Method of treating papermaking fibers for making tissue173US 5,348,620 AKimberly-Clark Corporation · 1994
- Method of treating papermaking fibers for making tissue146US 5,501,768 AKimberly-Clark Corporation · 1996