D21H 21/32
Bleaching agents
Official title: Bleaching agents (bleaching cellulose pulp D21C9/10)
D21H21/32 (Bleaching agents) appears on 67 US grants and 103 published applications in this corpus.
Search patents in D21H- Granted patents
- 67
- Published applications
- 103
- Assignees
- 51
- Inventors
- 145
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 2 | 0 |
| 2000 | 1 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 1 |
| 2003 | 1 | 0 |
| 2004 | 1 | 2 |
| 2005 | 0 | 1 |
| 2006 | 1 | 1 |
| 2007 | 1 | 4 |
| 2008 | 0 | 3 |
| 2009 | 1 | 3 |
| 2010 | 0 | 4 |
| 2011 | 2 | 5 |
| 2012 | 7 | 1 |
| 2013 | 3 | 13 |
| 2014 | 4 | 5 |
| 2015 | 7 | 21 |
| 2016 | 5 | 8 |
| 2017 | 4 | 6 |
| 2018 | 5 | 5 |
| 2019 | 4 | 4 |
| 2020 | 2 | 4 |
| 2021 | 5 | 6 |
| 2022 | 1 | 2 |
| 2023 | 3 | 2 |
| 2024 | 0 | 1 |
| 2025 | 2 | 1 |
| 2026 | 1 | 0 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method for reducing amount of bacterial endospores in an aqueous fibre suspension28 Apr 2026US 12,612,736 B2Kemira Oyj
- Oxidized cellulose materials15 Apr 2025US 12,276,069 B2GP Cellulose GmbH
- Sulfite-based processes for producing nanocellulose, and compositions and products produced therefrom7 Jan 2025US 12,188,181 B2GranBio Intellectual Property Holdings, LLC
- Enhanced peroxygen stability in multi-dispense TAED-containing peroxygen solid22 Aug 2023US 11,731,889 B2Ecolab USA Inc.
- Light-selective mulch4 Apr 2023US 11,617,311 B2
- Sulfite-based processes for producing nanocellulose, and compositions and products produced therefrom14 Aug 2025US 2025/0257527 A1GranBio Intellectual Property Holdings, LLC
- Method for reducing amount of bacterial endospores in an aqueous fibre suspension18 Jan 2024US 2024/0018726 A1Kemira Oyj
- Oxidized cellulose materials19 Oct 2023US 2023/0332358 A1GP Cellulose GmbH
- Odor control pulp composition12 Jan 2023US 2023/0009849 A1International Paper Company
- Paperboard structures and methods for manufacturing paperboard structures22 Sep 2022US 2022/0297335 A1
Most cited
By later US patents
- Lignocellulosic materials and the products made therefrom35US 8,007,635 B2International Paper Company · 2011
- Method of whitening lignin-containing paper pulps28US 5,902,454 ACiba Specialty Chemicals Corporation · 1999
- Ligno cellulosic materials and the products made therefrom26US 8,282,774 B2International Paper Company · 2012
- Pattern forming saturator and method15US 4,740,391 AMiply Equipment, Inc. · 1988
- Use of aminonitrile N-oxides as bleach activators15US 6,007,583 AClariant GmbH · 1999