D21C 9/1042
Use of chelating agents
Official title: {Use of chelating agents}
D21C9/1042 (Use of chelating agents) appears on 91 US grants and 72 published applications in this corpus.
Search patents in D21C- Granted patents
- 91
- Published applications
- 72
- Assignees
- 79
- Inventors
- 270
- Latest grant
- 1 Oct 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 1 | 0 |
| 1991 | 2 | 0 |
| 1992 | 4 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 2 | 0 |
| 1997 | 4 | 0 |
| 1998 | 2 | 0 |
| 1999 | 7 | 0 |
| 2000 | 8 | 0 |
| 2001 | 7 | 0 |
| 2002 | 1 | 3 |
| 2003 | 4 | 2 |
| 2004 | 4 | 4 |
| 2005 | 1 | 4 |
| 2006 | 1 | 2 |
| 2007 | 3 | 3 |
| 2008 | 1 | 4 |
| 2009 | 0 | 7 |
| 2010 | 1 | 8 |
| 2011 | 4 | 3 |
| 2012 | 5 | 4 |
| 2013 | 3 | 4 |
| 2014 | 6 | 4 |
| 2015 | 2 | 0 |
| 2016 | 0 | 2 |
| 2017 | 0 | 2 |
| 2018 | 2 | 3 |
| 2019 | 1 | 1 |
| 2020 | 1 | 2 |
| 2021 | 2 | 3 |
| 2022 | 2 | 1 |
| 2023 | 2 | 3 |
| 2024 | 1 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Oxygen bleaching method of pulp1 Oct 2024US 12,104,321 B2Beijing Forestry University
- Aminocarboxylate chelating agents and detergent compositions containing them1 Aug 2023US 11,713,435 B2Eastman Chemical Company
- Method for preparing dissolving pulp by TCF bleaching of poplar KP9 May 2023US 11,643,777 B2Qilu University of Technology
- Method for bleaching paper pulp12 Jul 2022US 11,384,480 B2Centre Technique De L' Industrie Des Papiers, Cartons Et Celluloses
- Process for the preparation of a mixture of chelating agents, mixture of chelating agents and methods of using them18 Jan 2022US 11,225,456 B2Kemira Oyj
- Carboxymethylated lysine-based polymer and compositions comprising the same16 Jul 2026US 2026/0201119 A1BASF SE
- Producing nanofibers, microfibers, and lignin from lignocellulosic biomass22 Jan 2026US 2026/0022519 A1University of Washington
- Edds adduct compositions29 Aug 2024US 2024/0286992 A1Innospec Limited
- Method for bleaching pulp from recycled textile material7 Dec 2023US 2023/0392320 A1Valmet Corporation
- Oxygen bleaching method of pulp31 Aug 2023US 2023/0272580 A1Beijing Forestry University
Most cited
By later US patents
- Alkaline peroxide mechanical pulping of non-woody species86US 6,258,207 B1Alberta Research Council · 2001
- Use of glycine-N,N-diacetic acid derivatives as biodegradable complexing agents for alkaline earth metal ions and heavy metal ions and process for the preparation thereof59US 5,786,313 ABASF SE · 1998
- A process for delignifying pulp with organic peroxyacid in the presence of phosphonic acids and their salts50US 5,552,018 ASolvay Interox (Societe Anonyme) · 1996
- Process for increasing pulp brightness with zeolites and easily decomposable organic chelating agents46US 5,227,022 ADegussa AG · 1993
- Chemical method for lignin depolymerization39US 6,214,976 B12001