D21C 9/1073
With o3
Official title: {with O3 (closed, see D21C9/153)}
D21C9/1073 (With o3) appears on 15 US grants and 8 published applications in this corpus.
Search patents in D21C- Granted patents
- 15
- Published applications
- 8
- Assignees
- 16
- Inventors
- 39
- Latest grant
- 22 Jul 2025
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 3 | 0 |
| 1979 | 0 | 0 |
| 1980 | 2 | 0 |
| 1981 | 3 | 0 |
| 1982 | 1 | 0 |
| 1983 | 1 | 0 |
| 1984 | 2 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 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 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 0 | 1 |
| 2021 | 0 | 2 |
| 2022 | 0 | 0 |
| 2023 | 1 | 0 |
| 2024 | 0 | 1 |
| 2025 | 1 | 2 |
By publication year. Applications have been published since 2001.
Recent patents
- Method for producing recycled pulp fibers, and recycled pulp fibers22 Jul 2025US 12,364,629 B2Unicharm Corporation
- Method for producing recycled pulp fibers by decomposing super absorbant polymers with ozone3 Oct 2023US 11,771,604 B2Unicharm Corporation
- Method for treating chemical pulps by treatment with ozone in the presence of magnesium ions26 Jun 2018US 10,006,168 B2Arkema France
- Method of gas treatment of fluffed pulp28 Aug 1984US 4,468,286 AMyrens Verksted A/S
- Apparatus for treating fibrous material with a gas17 Jan 1984US 4,426,256 AMyrens Verksted A/S
- Use of cellulase to improve viscosity control of kraft dissolving pulp9 Oct 2025US 2025/0314012 A1Novozymes A/S
- Recycling of mixtures of textiles comprising cellulose8 May 2025US 2025/0146218 A1Circulose AB
- Method for producing recycled pulp fibers, and recycled pulp fibers15 Feb 2024US 2024/0050290 A1Unicharm Corporation
- Absorption and filtration media23 Dec 2021US 2021/0395465 A1Wool Research Organisation of New Zealand, Inc.
- Method For Preparing Dissolving Pulp By Totally Chlorine-Free Bleaching Of Poplar Kraft Pulp4 Mar 2021US 2021/0062419 A1Qilu University of Technology
Most cited
By later US patents
- Delignification and bleaching of a lignocellulosic pulp slurry with ozone38US 4,080,249 AInternational Paper Company · 1978
- Method for bleaching pulp with ozone35US 4,278,496 AMyrens Verksted A/S · 1981
- Method for treating refined mechanical pulp and thermo mechanical pulp with ozone35US 4,279,694 AMyrens Verksted A/S · 1981
- Ozone effluent bleaching33US 4,283,251 AScott Paper Company · 1981
- Method and an apparatus for processing finely divided fibrous pulp with gas without overpressure31US 4,123,317 AMyrens Verksted A/S · 1978