D21C 9/142
With clo2/cl2 in a multistage process involving clo2/cl2 exclusively
Official title: {with ClO2/Cl2 in a multistage process involving ClO2/Cl2 exclusively}
D21C9/142 (With clo2/cl2 in a multistage process involving clo2/cl2 exclusively) appears on 19 US grants and 19 published applications in this corpus.
Search patents in D21C- Granted patents
- 19
- Published applications
- 19
- Assignees
- 17
- Inventors
- 37
- Latest grant
- 17 Jun 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 2 | 0 |
| 1984 | 0 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 1 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 0 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 1 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 1 |
| 2009 | 0 | 0 |
| 2010 | 0 | 1 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 1 |
| 2014 | 2 | 1 |
| 2015 | 1 | 0 |
| 2016 | 0 | 2 |
| 2017 | 0 | 2 |
| 2018 | 2 | 2 |
| 2019 | 3 | 2 |
| 2020 | 3 | 0 |
| 2021 | 0 | 1 |
| 2022 | 0 | 1 |
| 2023 | 0 | 2 |
| 2024 | 1 | 0 |
| 2025 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Method of replacing sodium losses in a pulp mill, a method of producing bleached cellulosic pulp, and a system17 Jun 2025US 12,331,460 B2Metsa Fibre Oy
- Process for producing refined cotton with high polymerization degree19 Mar 2024US 11,932,989 B2Hubei Jinhanjiang Refined Cotton Co., Ltd.
- Method for production of cellulose nanocrystals from Miscanthus giganteus and composites therefrom6 Oct 2020US 10,793,647 B2Case Western Reserve University
- Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same25 Aug 2020US 10,753,043 B2GP Cellulose GmbH
- Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same4 Feb 2020US 10,550,516 B2GP Cellulose GmbH
- Method for pitch control during bleaching6 Jul 2023US 2023/0212821 A1Kemira Oyj
- Process for producing refined cotton with high polymerization degree16 Feb 2023US 2023/0046123 A1Hubei Jinhanjiang Refined Cotton Co., Ltd.
- A method of replacing sodium losses in a pulp mill, a method of producing bleached cellulosic pulp, and a system7 Apr 2022US 2022/0106737 A1Andritz Inc.
- Method for production of cellulose nanocrystals from miscanthus giganteus and composites therefrom13 May 2021US 2021/0139613 A1Case Western Reserve University
- Low Viscosity Kraft Fiber Having an Enhanced Carboxyl Content and Methods of Making and Using the Same9 May 2019US 2019/0136450 A1
Most cited
By later US patents
- Method for multistage bleaching and washing with recycle of displaced bleaching liquor16US 4,529,479 ARauma-Repola Oy · 1985
- High efficiency two-step, high-low pH chlorine dioxide pulp bleaching process3US 5,268,075 ANorth Carolina State University · 1993
- Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same2US 10,174,455 B2GP Cellulose GmbH · 2019
- Method of bleaching pulp with an aqueous solution of chlorine dioxide and chlorine followed by a chlorine solution2US 4,299,653 AERCO Industries Limited · 1981
- Bleaching procedure using chlorine dioxide and chlorine solutions2US 4,421,598 AERCO Industries Limited · 1983