D21C 9/12
With halogens or halogen-containing compounds
Official title: with halogens or halogen-containing compounds (D21C9/16 takes precedence)
D21C9/12 (With halogens or halogen-containing compounds) appears on 182 US grants and 182 published applications in this corpus.
Search patents in D21C- Granted patents
- 182
- Published applications
- 182
- Assignees
- 117
- Inventors
- 370
- Latest grant
- 8 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 4 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 4 | 0 |
| 1984 | 1 | 0 |
| 1985 | 4 | 0 |
| 1986 | 2 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 3 | 0 |
| 1990 | 3 | 0 |
| 1991 | 3 | 0 |
| 1992 | 6 | 0 |
| 1993 | 2 | 0 |
| 1994 | 2 | 0 |
| 1995 | 2 | 0 |
| 1996 | 1 | 0 |
| 1997 | 3 | 0 |
| 1998 | 3 | 0 |
| 1999 | 5 | 0 |
| 2000 | 4 | 0 |
| 2001 | 7 | 1 |
| 2002 | 3 | 2 |
| 2003 | 4 | 6 |
| 2004 | 3 | 6 |
| 2005 | 1 | 5 |
| 2006 | 0 | 8 |
| 2007 | 1 | 5 |
| 2008 | 2 | 6 |
| 2009 | 2 | 7 |
| 2010 | 0 | 8 |
| 2011 | 3 | 7 |
| 2012 | 7 | 7 |
| 2013 | 4 | 8 |
| 2014 | 13 | 8 |
| 2015 | 3 | 9 |
| 2016 | 4 | 8 |
| 2017 | 5 | 12 |
| 2018 | 12 | 11 |
| 2019 | 6 | 14 |
| 2020 | 10 | 9 |
| 2021 | 6 | 5 |
| 2022 | 8 | 8 |
| 2023 | 6 | 8 |
| 2024 | 5 | 5 |
| 2025 | 5 | 6 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Crystalline cellulose reinforced cement8 Sep 2026US 12,729,158 B2
- Hemp paper packaging material for foodstuff17 Feb 2026US 12,553,184 B2Wm. Wrigley Jr. Company
- Collapsible engagement mechanism13 Jan 2026US 12,522,537 B2
- 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
- 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
- Collapsible engagement mechanism23 Apr 2026US 2026/0109646 A1
- Composition and use thereof25 Dec 2025US 2025/0388501 A1Shikoku Chemicals Corporation
- Use of cellulase to improve viscosity control of kraft dissolving pulp9 Oct 2025US 2025/0314012 A1Novozymes A/S
Most cited
By later US patents
- Process to manufacture stabilized alkali or alkaline earth metal hypobromite and uses thereof in water treatment to control microbial fouling95US 5,683,654 A1997
- Multi-stage bleaching process including an enhanced oxidative extraction stage77US 4,568,420 AInternational Paper Company · 1986
- Process to manufacture stabilized alkali or alkaline earth metal hypobromite and uses thereof in water treatment to control microbial fouling55US 5,795,487 ANalco Chemical Company · 1998
- Process to manufacture stabilized alkali or alkaline earth metal hypobromite and uses thereof in water treatment to control microbial fouling46US 5,942,126 ANalco Chemical Company · 1999
- High-yield chemical pulping41US 4,869,783 AThe Mead Corporation · 1989