D21C 9/1084
With reducing compounds
Official title: {with reducing compounds}
D21C9/1084 (With reducing compounds) appears on 58 US grants and 46 published applications in this corpus.
Search patents in D21C- Granted patents
- 58
- Published applications
- 46
- Assignees
- 43
- Inventors
- 150
- Latest grant
- 12 Dec 2023
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 1 | 0 |
| 1987 | 1 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 2 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 1 | 3 |
| 2003 | 2 | 2 |
| 2004 | 1 | 8 |
| 2005 | 0 | 0 |
| 2006 | 2 | 4 |
| 2007 | 3 | 5 |
| 2008 | 0 | 1 |
| 2009 | 0 | 1 |
| 2010 | 1 | 2 |
| 2011 | 2 | 2 |
| 2012 | 2 | 1 |
| 2013 | 1 | 3 |
| 2014 | 3 | 1 |
| 2015 | 1 | 2 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 3 |
| 2019 | 0 | 1 |
| 2020 | 3 | 1 |
| 2021 | 2 | 3 |
| 2022 | 0 | 2 |
| 2023 | 4 | 1 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- High efficiency fiber bleaching process12 Dec 2023US 11,840,805 B2GPCP IP Holdings LLC
- Method for producing bleached wood fibre material15 Aug 2023US 11,725,338 B2BASF SE
- Dissolving wood pulps and methods of making and using the same30 May 2023US 11,661,704 B2GP Cellulose GmbH
- High efficiency fiber bleaching process28 Feb 2023US 11,591,751 B2GPCP IP Holdings LLC
- Dissolving wood pulps and methods of making and using the same31 Aug 2021US 11,105,042 B2GP Cellulose GmbH
- High Efficiency Fiber Bleaching Process1 Jun 2023US 2023/0167604 A1GPCP IP Holdings LLC
- Cellulose material plasticization and viscosity controlled cellulosic material22 Sep 2022US 2022/0298725 A1Upm-Kymmene Corporation
- Method for manufacturing bleached pulp, feedstock, and packaging system25 Aug 2022US 2022/0267957 A1WestRock MWV, LLC
- Novel dissolving wood pulps and methods of making and using the same18 Nov 2021US 2021/0355635 A1GP Cellulose GmbH
- Method for producing bleached wood fibre material19 Aug 2021US 2021/0254280 A1BASF SE
Most cited
By later US patents
- Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner18US 5,129,987 AMorton Thiokol, Inc. · 1992
- Sulphinic acid derivatives, method for producing them, and their use18US 6,211,400 B1L. BrüGgemann GmbH & Co. KG · 2001
- Bleaching recycled pulp with a reductive-oxidative sequence17US 5,464,501 ASociete Anonyme pour l'Etude et l'Exploitation l'Air Liquide, des Procedes Georges Claude · 1995
- Stabilized sodium dithionite solutions15US 3,985,674 AVirginia Chemicals Inc. · 1976
- Process for de-inking recycled paper pulp with a reducing agent13US 5,429,716 AMorton International, Inc. · 1995