D21C 9/147
With oxygen or its allotropic modifications
Official title: with oxygen or its allotropic modifications (D21C9/16 takes precedence)
D21C9/147 (With oxygen or its allotropic modifications) appears on 270 US grants and 169 published applications in this corpus.
Search patents in D21C- Granted patents
- 270
- Published applications
- 169
- Assignees
- 132
- Inventors
- 457
- Latest grant
- 24 Feb 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 3 | 0 |
| 1987 | 1 | 0 |
| 1988 | 0 | 0 |
| 1989 | 2 | 0 |
| 1990 | 4 | 0 |
| 1991 | 5 | 0 |
| 1992 | 13 | 0 |
| 1993 | 11 | 0 |
| 1994 | 18 | 0 |
| 1995 | 18 | 0 |
| 1996 | 12 | 0 |
| 1997 | 18 | 0 |
| 1998 | 16 | 0 |
| 1999 | 12 | 0 |
| 2000 | 11 | 0 |
| 2001 | 13 | 3 |
| 2002 | 9 | 6 |
| 2003 | 5 | 6 |
| 2004 | 11 | 5 |
| 2005 | 2 | 9 |
| 2006 | 1 | 5 |
| 2007 | 3 | 4 |
| 2008 | 0 | 7 |
| 2009 | 0 | 5 |
| 2010 | 0 | 6 |
| 2011 | 3 | 9 |
| 2012 | 6 | 4 |
| 2013 | 2 | 3 |
| 2014 | 5 | 4 |
| 2015 | 4 | 8 |
| 2016 | 3 | 9 |
| 2017 | 5 | 19 |
| 2018 | 8 | 7 |
| 2019 | 7 | 7 |
| 2020 | 11 | 13 |
| 2021 | 6 | 7 |
| 2022 | 4 | 6 |
| 2023 | 5 | 9 |
| 2024 | 6 | 1 |
| 2025 | 6 | 4 |
| 2026 | 1 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Process and apparatus for producing bleached cellulose24 Feb 2026US 12,559,885 B2Messer Austria GmbH
- High yield chemical pulping and bleaching process7 Oct 2025US 12,435,469 B2GPCP IP Holdings LLC
- Process and apparatus for white liquor oxidation9 Sep 2025US 12,410,557 B2Messer Austria GmbH
- Method for producing recycled pulp fibers, and recycled pulp fibers22 Jul 2025US 12,364,629 B2Unicharm Corporation
- Fluff pulp13 May 2025US 12,297,600 B2Stora Enso OYJ
- 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
- Method and system for recycling textile material30 Apr 2026US 2026/0117462 A1Valmet Corporation
- System for decolorization of material comprising cellulose11 Sep 2025US 2025/0283276 A1Andritz Inc.
- A Bleaching Process29 May 2025US 2025/0171958 A1AB Enzymes Oy
Most cited
By later US patents
- Process for producing a pulp suitable for papermaking from nonwood fibrous materials101US 6,302,997 B1HurterConsult Incorporated · 2001
- Stabilized gas-enriched and gas-supersaturated liquids101US 6,344,489 B12002
- Process for oxygen pulping of lignocellulosic material and recorvery of pulping chemicals96US 6,770,168 B1Kiram AB · 2004
- Method and apparatus for injection of gas hydrates75US 5,261,875 AWayne State University · 1993
- Method of microencapsulation of hyperbaric gas73US 5,086,620 AWayne State University · 1992