D21H 21/143
Agents preventing ageing of paper
Official title: {Agents preventing ageing of paper, e.g. radiation absorbing substances}
D21H21/143 (Agents preventing ageing of paper) appears on 22 US grants and 19 published applications in this corpus.
Search patents in D21H- Granted patents
- 22
- Published applications
- 19
- Assignees
- 18
- Inventors
- 65
- Latest grant
- 19 Jul 2022
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 1 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 0 |
| 2002 | 4 | 5 |
| 2003 | 2 | 1 |
| 2004 | 0 | 1 |
| 2005 | 0 | 1 |
| 2006 | 2 | 1 |
| 2007 | 1 | 2 |
| 2008 | 0 | 2 |
| 2009 | 0 | 0 |
| 2010 | 2 | 0 |
| 2011 | 0 | 1 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 1 |
| 2015 | 0 | 0 |
| 2016 | 0 | 0 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
| 2019 | 0 | 1 |
| 2020 | 1 | 1 |
| 2021 | 0 | 0 |
| 2022 | 1 | 1 |
| 2023 | 0 | 0 |
| 2024 | 0 | 1 |
By publication year. Applications have been published since 2001.
Recent patents
- Flame retardant paper19 Jul 2022US 11,390,998 B2Toray Industries, Inc.
- UV blocking film and composition comprising microfibrillated cellulose, a method for producing said film and use of the composition25 Aug 2020US 10,752,741 B2Stora Enso OYJ
- Processes and compositions for brightness improvement in paper production3 Apr 2018US 9,932,709 B2Ecolab USA Inc.
- Chlorohydrin and cationic compounds having high affinity for pulp or paper17 Aug 2010US 7,776,182 B2Ciba Specialty Chemicals Corporation
- Light stabilizer emulsion composition2 Mar 2010US 7,671,096 B2Adeka Corporation
- Decorative panel and a decorative foil for a decorative panel18 Jul 2024US 2024/0240405 A1Unilin BV
- Platelike thermal insulation material made from recycled and environmentally friendly raw materials5 May 2022US 2022/0136176 A1Balticfloc, Sia
- Flame retardant paper24 Dec 2020US 2020/0399833 A1Toray Industries, Inc.
- A uv blocking film and composition comprising microfibrillated cellulose, a method for producing said film and use of the composition26 Sep 2019US 2019/0292337 A1Stora Enso OYJ
- Processes and compositions for brightness improvement in paper production18 Sep 2014US 2014/0259458 A1Ecolab USA Inc.
Most cited
By later US patents
- Paper and a method of paper manufacture51US 5,368,689 AMo och Domsjo Aktiebolag · 1994
- Preparation of brightness stabilization agent for lignin containing pulp from biomass pyrolysis oils49US 6,193,837 B1Midwest Research Institute · 2001
- Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives44US 6,254,724 B1Ciba Specialty Chemicals Corporation · 2001
- Inhibition of pulp and paper yellowing using hydroxylamines and other coadditives17US 6,599,326 B1Ciba Specialty Chemicals Corporation · 2003
- Inhibition of pulp and paper yellowing using nitroxides, hydroxylamines and other coadditives13US 6,447,644 B1Ciba Specialty Chemicals Corporation · 2002