D21C 9/153
With ozone
Official title: with ozone
D21C9/153 (With ozone) appears on 138 US grants and 69 published applications in this corpus.
Search patents in D21C- Granted patents
- 138
- Published applications
- 69
- Assignees
- 78
- Inventors
- 268
- Latest grant
- 7 Oct 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1990 | 2 | 0 |
| 1991 | 4 | 0 |
| 1992 | 6 | 0 |
| 1993 | 3 | 0 |
| 1994 | 11 | 0 |
| 1995 | 15 | 0 |
| 1996 | 8 | 0 |
| 1997 | 11 | 0 |
| 1998 | 11 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 7 | 0 |
| 2002 | 5 | 1 |
| 2003 | 4 | 4 |
| 2004 | 2 | 2 |
| 2005 | 0 | 6 |
| 2006 | 1 | 0 |
| 2007 | 1 | 2 |
| 2008 | 0 | 2 |
| 2009 | 0 | 2 |
| 2010 | 0 | 4 |
| 2011 | 2 | 4 |
| 2012 | 3 | 2 |
| 2013 | 0 | 0 |
| 2014 | 3 | 0 |
| 2015 | 0 | 2 |
| 2016 | 0 | 2 |
| 2017 | 1 | 7 |
| 2018 | 1 | 2 |
| 2019 | 2 | 3 |
| 2020 | 4 | 9 |
| 2021 | 3 | 2 |
| 2022 | 3 | 2 |
| 2023 | 4 | 5 |
| 2024 | 3 | 1 |
| 2025 | 2 | 4 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- High yield chemical pulping and bleaching process7 Oct 2025US 12,435,469 B2GPCP IP Holdings LLC
- Method for producing recycled pulp fibers, and recycled pulp fibers22 Jul 2025US 12,364,629 B2Unicharm Corporation
- Arrangement and method for degassing a pump24 Dec 2024US 12,173,451 B2Andritz Inc.
- Method for producing pulp fibers for cellulose nanofiberization, and pulp fibers for cellulose nanofiberization21 May 2024US 11,987,932 B2Unicharm Corporation
- Method for producing softwood-derived pulp fibers for paper and softwood-derived pulp fibers for paper23 Jan 2024US 11,879,210 B2Unicharm Corporation
- 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
- Method for distrubting chemicals in delignifiction stages of pulp bleaching process17 Apr 2025US 2025/0122668 A1Andritz Inc.
- Arrangement and method for degassing a pump27 Mar 2025US 2025/0101681 A1Andritz Inc.
Most cited
By later US patents
- Process for producing a pulp suitable for papermaking from nonwood fibrous materials101US 6,302,997 B1HurterConsult Incorporated · 2001
- Process for acid bleaching of lignocellulose-containing pulp with a magnesium compound49US 6,398,908 B1Eka Nobel AB · 2002
- Ozone sterilizer45US 5,069,880 A1991
- Environmentally improved process for bleaching lignocellulosic materials with oxygen, ozone and chlorine dioxide40US 5,296,099 AUnion Camp Holding, Inc. · 1994
- Pulp bleaching reactor for dispersing high consistency pulp into a gaseous bleaching agent containing ozone40US 5,863,389 AUnion Camp Patent Holding, Inc. · 1999