D21B
Fibrous raw materials or their mechanical treatment
D21B (Fibrous raw materials or their mechanical treatment) appears on 1,584 US grants and 1,170 published applications in this corpus.
Search patents in D21B- Granted patents
- 1,584
- Published applications
- 1,170
- Assignees
- 713
- Inventors
- 2,538
- Latest grant
- 18 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 18 | 0 |
| 1977 | 21 | 0 |
| 1978 | 12 | 0 |
| 1979 | 22 | 0 |
| 1980 | 42 | 0 |
| 1981 | 37 | 0 |
| 1982 | 20 | 0 |
| 1983 | 32 | 0 |
| 1984 | 25 | 0 |
| 1985 | 19 | 0 |
| 1986 | 30 | 0 |
| 1987 | 30 | 0 |
| 1988 | 34 | 0 |
| 1989 | 24 | 0 |
| 1990 | 30 | 0 |
| 1991 | 29 | 0 |
| 1992 | 33 | 0 |
| 1993 | 28 | 0 |
| 1994 | 36 | 0 |
| 1995 | 35 | 0 |
| 1996 | 39 | 0 |
| 1997 | 38 | 0 |
| 1998 | 40 | 0 |
| 1999 | 35 | 0 |
| 2000 | 30 | 0 |
| 2001 | 45 | 13 |
| 2002 | 33 | 29 |
| 2003 | 20 | 35 |
| 2004 | 19 | 49 |
| 2005 | 17 | 37 |
| 2006 | 13 | 34 |
| 2007 | 25 | 35 |
| 2008 | 13 | 40 |
| 2009 | 19 | 23 |
| 2010 | 21 | 44 |
| 2011 | 22 | 30 |
| 2012 | 29 | 40 |
| 2013 | 29 | 54 |
| 2014 | 41 | 46 |
| 2015 | 47 | 46 |
| 2016 | 35 | 64 |
| 2017 | 42 | 64 |
| 2018 | 33 | 52 |
| 2019 | 48 | 78 |
| 2020 | 47 | 76 |
| 2021 | 59 | 61 |
| 2022 | 45 | 39 |
| 2023 | 39 | 54 |
| 2024 | 36 | 59 |
| 2025 | 42 | 44 |
| 2026 | 26 | 24 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Main groups
Granted patents with any code in the group
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
- Compostable sleeve apparatus and method of manufacture17 Sep 2026US 2026/0274549 A1
- 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)
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
- Biocomposite material and method of making155US 5,593,625 APhenix Biocomposites, Inc. · 1997