D21C 5/00
Production of cellulose by removing non-cellulose substances from cellulose-containing materials: other processes
Official title: Other processes for obtaining cellulose, e.g. cooking cotton linters (obtaining fibres for spinning D01C); {Processes characterised by the choice of cellulose-containing starting materials}
D21C5/00 (Production of cellulose by removing non-cellulose substances from cellulose-containing materials: other processes) appears on 1,364 US grants and 1,158 published applications in this corpus.
Search patents in D21C- Granted patents
- 1,364
- Published applications
- 1,158
- Assignees
- 748
- Inventors
- 3,060
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 10 | 0 |
| 1977 | 6 | 0 |
| 1978 | 5 | 0 |
| 1979 | 4 | 0 |
| 1980 | 9 | 0 |
| 1981 | 9 | 0 |
| 1982 | 10 | 0 |
| 1983 | 11 | 0 |
| 1984 | 10 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 10 | 0 |
| 1988 | 8 | 0 |
| 1989 | 9 | 0 |
| 1990 | 14 | 0 |
| 1991 | 20 | 0 |
| 1992 | 25 | 0 |
| 1993 | 30 | 0 |
| 1994 | 43 | 0 |
| 1995 | 41 | 0 |
| 1996 | 40 | 0 |
| 1997 | 56 | 0 |
| 1998 | 68 | 0 |
| 1999 | 68 | 0 |
| 2000 | 43 | 0 |
| 2001 | 55 | 9 |
| 2002 | 35 | 30 |
| 2003 | 25 | 28 |
| 2004 | 9 | 33 |
| 2005 | 8 | 43 |
| 2006 | 13 | 38 |
| 2007 | 18 | 30 |
| 2008 | 15 | 36 |
| 2009 | 10 | 39 |
| 2010 | 21 | 47 |
| 2011 | 26 | 44 |
| 2012 | 29 | 49 |
| 2013 | 26 | 59 |
| 2014 | 51 | 65 |
| 2015 | 38 | 71 |
| 2016 | 33 | 56 |
| 2017 | 47 | 62 |
| 2018 | 44 | 52 |
| 2019 | 35 | 60 |
| 2020 | 49 | 58 |
| 2021 | 50 | 63 |
| 2022 | 35 | 44 |
| 2023 | 33 | 42 |
| 2024 | 33 | 40 |
| 2025 | 50 | 42 |
| 2026 | 15 | 18 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Starch fixation and retention in recycled fiber systems28 Jul 2026US 12,692,654 B2Kemira Oyj
- Method of controlling enzymatic activities and tools related thereto21 Jul 2026US 12,686,971 B2Kemira Oyj
- Process and system for producing pulp, energy, and bioderivatives from plant-based and recycled materials14 Jul 2026US 12,678,759 B2Circ, LLC
- Method for preparing cellulose and lignin oil by depolymerizing lignocellulose without exogenous hydrogen30 Jun 2026US 12,668,669 B2East China University of Science and Technology
- Hygromorphic composite material16 Jun 2026US 12,655,582 B2Nanyang Technological University
- Process and System for Producing Pulp, Energy, and Bioderivatives from Plant-Based and Recycled Materials10 Sep 2026US 2026/0264040 A1Circ, LLC
- An apparatus for recycling paper and cardboard materials3 Sep 2026US 2026/0258603 A1Point of Origin Waste Solutions Limited
- Process for producing rigid cellulosic product20 Aug 2026US 2026/0243023 A1Honext Material, Sl
- Pulp mixture6 Aug 2026US 2026/0226680 A1SöDra SkogsäGarna Ekonomisk FöRening
- Chemical wood pulp with enhanced tensile strength6 Aug 2026US 2026/0226685 A1SöDra SkogsäGarna Ekonomisk FöRening
Most cited
By later US patents
- Hesperaloe tissue having improved cross-machine direction properties809US 10,337,148 B2Kimberly-Clark Worldwide, Inc. · 2019
- Method for increasing the accessibility of cellulose in lignocellulosic materials, particularly hardwoods agricultural residues and the like177US 4,461,648 A1984
- Microfibrillated cellulose and method for preparing a microfibrillated cellulose174US 5,964,983 AGeneral Sucriere · 1999
- Process for recovery of cellulose141US 5,057,334 AOrt's Inc. · 1991
- Modified cellulosic fibers and fibrous webs containing these fibers137US 6,146,494 AThe Procter & Gamble Company · 2000