D21C 9/14
With clo2 or chlorites
Official title: with ClO2 or chlorites
D21C9/14 (With clo2 or chlorites) appears on 146 US grants and 145 published applications in this corpus.
Search patents in D21C- Granted patents
- 146
- Published applications
- 145
- Assignees
- 94
- Inventors
- 306
- Latest grant
- 17 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 2 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 5 | 0 |
| 1993 | 2 | 0 |
| 1994 | 1 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 3 | 0 |
| 2001 | 7 | 0 |
| 2002 | 2 | 2 |
| 2003 | 4 | 6 |
| 2004 | 3 | 5 |
| 2005 | 0 | 3 |
| 2006 | 0 | 8 |
| 2007 | 1 | 3 |
| 2008 | 2 | 5 |
| 2009 | 2 | 7 |
| 2010 | 0 | 8 |
| 2011 | 3 | 7 |
| 2012 | 6 | 5 |
| 2013 | 4 | 6 |
| 2014 | 10 | 5 |
| 2015 | 2 | 7 |
| 2016 | 2 | 7 |
| 2017 | 4 | 9 |
| 2018 | 10 | 9 |
| 2019 | 6 | 12 |
| 2020 | 9 | 5 |
| 2021 | 3 | 4 |
| 2022 | 6 | 6 |
| 2023 | 6 | 7 |
| 2024 | 3 | 4 |
| 2025 | 4 | 3 |
| 2026 | 1 | 2 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Hemp paper packaging material for foodstuff17 Feb 2026US 12,553,184 B2Wm. Wrigley Jr. Company
- Treated Kraft pulp compositions and methods of making the same19 Aug 2025US 12,392,086 B2International Paper Company
- 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
- Engineered corn husk compositions and methods13 May 2025US 12,297,595 B2Specialized Products & Services Co., Inc.
- Bleaching trichomes to remove proteins4 Feb 2025US 12,215,461 B2The Procter & Gamble Company
- Hemp paper packaging material for foodstuff21 May 2026US 2026/0139435 A1North Carolina State University
- Method and system for recycling textile material30 Apr 2026US 2026/0117462 A1Valmet Corporation
- Use of cellulase to improve viscosity control of kraft dissolving pulp9 Oct 2025US 2025/0314012 A1Novozymes A/S
- Method for distrubting chemicals in delignifiction stages of pulp bleaching process17 Apr 2025US 2025/0122668 A1Andritz Inc.
- Bleaching Trichomes to Remove Proteins10 Apr 2025US 2025/0116064 A1The Procter & Gamble Company
Most cited
By later US patents
- Multi-stage bleaching process including an enhanced oxidative extraction stage77US 4,568,420 AInternational Paper Company · 1986
- High-yield chemical pulping41US 4,869,783 AThe Mead Corporation · 1989
- Process for the production of chlorine dioxide39US 5,091,166 AEka Nobel AB · 1992
- Process for bleaching chemical pulp simultaneously with chlorine dioxide, peroxide and a reaction catalyst38US 6,432,266 B1Mitsubishi Gas Chemical Company, Inc. · 2002
- Process for the production of chlorine dioxide35US 5,091,167 AEka Nobel AB · 1992