D21H 21/30
Luminescent or fluorescent substances
Official title: Luminescent or fluorescent substances, e.g. for optical bleaching (D21H21/40 takes precedence)
D21H21/30 (Luminescent or fluorescent substances) appears on 213 US grants and 213 published applications in this corpus.
Search patents in D21H- Granted patents
- 213
- Published applications
- 213
- Assignees
- 103
- Inventors
- 464
- Latest grant
- 28 Apr 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 4 | 0 |
| 1977 | 0 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 5 | 0 |
| 1981 | 1 | 0 |
| 1982 | 3 | 0 |
| 1983 | 2 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 1 | 0 |
| 1990 | 1 | 0 |
| 1991 | 5 | 0 |
| 1992 | 5 | 0 |
| 1993 | 3 | 0 |
| 1994 | 3 | 0 |
| 1995 | 1 | 0 |
| 1996 | 1 | 0 |
| 1997 | 2 | 0 |
| 1998 | 4 | 0 |
| 1999 | 4 | 0 |
| 2000 | 6 | 0 |
| 2001 | 6 | 2 |
| 2002 | 8 | 4 |
| 2003 | 3 | 6 |
| 2004 | 2 | 10 |
| 2005 | 6 | 9 |
| 2006 | 4 | 15 |
| 2007 | 4 | 12 |
| 2008 | 2 | 14 |
| 2009 | 9 | 15 |
| 2010 | 7 | 13 |
| 2011 | 7 | 17 |
| 2012 | 6 | 14 |
| 2013 | 12 | 12 |
| 2014 | 13 | 14 |
| 2015 | 10 | 12 |
| 2016 | 7 | 10 |
| 2017 | 6 | 7 |
| 2018 | 9 | 8 |
| 2019 | 7 | 6 |
| 2020 | 10 | 2 |
| 2021 | 7 | 6 |
| 2022 | 3 | 2 |
| 2023 | 0 | 2 |
| 2024 | 1 | 1 |
| 2025 | 2 | 0 |
| 2026 | 2 | 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
- Coating composition for paper and paperboard20 Jan 2026US 12,529,190 B2Stora Enso OYJ
- Engineered corn husk compositions and methods13 May 2025US 12,297,595 B2Specialized Products & Services Co., Inc.
- Optically variable security devices21 Jan 2025US 12,204,120 B2Viavi Solutions Inc.
- Multi-luminescent security element and value or security product containing said security element23 Jan 2024US 11,879,083 B2Bundesdruckerei GmbH
- Method for reducing amount of bacterial endospores in an aqueous fibre suspension18 Jan 2024US 2024/0018726 A1Kemira Oyj
- Optically variable security devices28 Sep 2023US 2023/0305202 A1Viavi Solutions Inc.
- Binding material and method for manufacturing molded body13 Apr 2023US 2023/0116888 A1Seiko Epson Corporation
- Multi-Luminescent Security Element and Value or Security Product Containing Said Security Element23 Jun 2022US 2022/0195293 A1Bundesdruckerei GmbH
- Engineered Corn Husk Compositions And Methods3 Feb 2022US 2022/0034028 A1DW Specialized Products & Services, Inc.
Most cited
By later US patents
- Ink jet recording process using certain benzotriazole derivatives as light stabilizers74US 4,926,190 ACiba-Geigy Corporation · 1990
- Process of manufacturing authenticatable paper products73US 6,054,021 AWestvaco Corporation · 2000
- Light-stabilized ink composition69US 5,124,723 ACiba-Geigy Corporation · 1992
- Whitened fluff pulp51US 6,893,473 B2Weyerhaeuser Company · 2005
- Fluorescent particles, method for preparing the same and paper preventing forgery using the fluorescent particle42US 6,663,960 B1Tokushu Paper Mfg. Co., Ltd. · 2003