D21B 1/00
Fibrous raw materials or their mechanical treatment
Official title: Fibrous raw materials or their mechanical treatment (pretreatment of the finely-divided materials before digesting D21C1/00; methods of beating or refining pulp D21D1/00; purification of the pulp suspension by mechanical means D21D5/00)
D21B1/00 (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.
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
- 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