D21H 21/28
Colorants
Official title: Colorants {; Pigments or opacifying agents}
D21H21/28 (Colorants) appears on 427 US grants and 279 published applications in this corpus.
Search patents in D21H- Granted patents
- 427
- Published applications
- 279
- Assignees
- 207
- Inventors
- 839
- Latest grant
- 13 Jan 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 8 | 0 |
| 1977 | 6 | 0 |
| 1978 | 12 | 0 |
| 1979 | 6 | 0 |
| 1980 | 10 | 0 |
| 1981 | 11 | 0 |
| 1982 | 14 | 0 |
| 1983 | 20 | 0 |
| 1984 | 14 | 0 |
| 1985 | 11 | 0 |
| 1986 | 6 | 0 |
| 1987 | 13 | 0 |
| 1988 | 7 | 0 |
| 1989 | 6 | 0 |
| 1990 | 9 | 0 |
| 1991 | 7 | 0 |
| 1992 | 9 | 0 |
| 1993 | 4 | 0 |
| 1994 | 5 | 0 |
| 1995 | 6 | 0 |
| 1996 | 12 | 0 |
| 1997 | 8 | 0 |
| 1998 | 7 | 0 |
| 1999 | 7 | 0 |
| 2000 | 11 | 0 |
| 2001 | 11 | 2 |
| 2002 | 12 | 9 |
| 2003 | 8 | 10 |
| 2004 | 5 | 8 |
| 2005 | 2 | 12 |
| 2006 | 2 | 9 |
| 2007 | 7 | 11 |
| 2008 | 5 | 8 |
| 2009 | 5 | 14 |
| 2010 | 1 | 15 |
| 2011 | 11 | 15 |
| 2012 | 8 | 16 |
| 2013 | 9 | 13 |
| 2014 | 13 | 9 |
| 2015 | 12 | 12 |
| 2016 | 4 | 12 |
| 2017 | 11 | 10 |
| 2018 | 10 | 12 |
| 2019 | 7 | 13 |
| 2020 | 9 | 13 |
| 2021 | 8 | 22 |
| 2022 | 13 | 9 |
| 2023 | 7 | 7 |
| 2024 | 12 | 10 |
| 2025 | 5 | 7 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Preparation method of eco-friendly long-lasting heat-sensitive paper13 Jan 2026US 12,522,982 B2Jiangxi Heshuofeng New Material Co., Ltd.
- Pulp quality monitoring28 Oct 2025US 12,454,796 B2Kemira Oyj
- Aqueous slurry for a coating colour composition for paper, board or the like19 Aug 2025US 12,392,088 B2Kemira Oyj
- Formulation for a fibrous non-woven facing material5 Aug 2025US 12,378,729 B2Owens Corning Intellectual Capital, LLC
- Process for producing coloured cardboard in a cardboard production apparatus, and coloured produced by such a process24 Jun 2025US 12,338,580 B2The Eska Company
- Compound, rubber blend containing the compound, vehicle tire comprising the rubber blend in at least one component, process for producing the compound, and use of the compound as an ageing protectant and/or antiozonant and/or dye3 Sep 2026US 2026/0257993 A1Continental Reifen Deutschland GmbH
- Lidar reflective black paper and non-woven articles20 Nov 2025US 2025/0354335 A1Toyota Jidosha Kabushiki Kaisha
- Coated cellulosic structures and method for manufacturing thereof30 Oct 2025US 2025/0333907 A1
- Anti-myopia paper sheet1 May 2025US 2025/0137201 A1Gansu Yuda Printing Materials Co., Ltd.
- Formulation for a fibrous non-woven facing material10 Apr 2025US 2025/0116066 A1Owens Corning Intellectual Capital, LLC
Most cited
By later US patents
- Cationic imidazole azo dyes292US 5,708,151 ACiba Specialty Chemicals Corporation · 1998
- Multi-elevational tissue paper containing selectively disposed chemical papermaking additive159US 5,840,403 AThe Procter & Gamble Company · 1998
- Reaction of carbon black with diazonium salts, resultant carbon black products and their uses157US 5,851,280 ACabot Corporation · 1998
- Multiply tissue paper156US 6,420,013 B1The Procter & Gamble Company · 2002
- Super microfibrillated cellulose, process for producing the same, and coated paper and tinted paper using the same136US 6,183,596 B2Tokushu Paper Mfg. Co., Ltd. · 2001