D21H 21/40
Agents facilitating proof of genuineness or preventing fraudulent alteration
Official title: Agents facilitating proof of genuineness or preventing fraudulent alteration, e.g. for security paper (watermarking B41M3/10, D21F1/44; security printing B41M3/14; securities or banknotes characterised by colour effects B42D25/29, B42D25/30; testing paper currency or valuable papers for genuineness G07D7/00)
D21H21/40 (Agents facilitating proof of genuineness or preventing fraudulent alteration) appears on 465 US grants and 461 published applications in this corpus.
Search patents in D21H- Granted patents
- 465
- Published applications
- 461
- Assignees
- 261
- Inventors
- 912
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 2 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 5 | 0 |
| 1984 | 13 | 0 |
| 1985 | 6 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 6 | 0 |
| 1989 | 4 | 0 |
| 1990 | 8 | 0 |
| 1991 | 9 | 0 |
| 1992 | 11 | 0 |
| 1993 | 11 | 0 |
| 1994 | 5 | 0 |
| 1995 | 8 | 0 |
| 1996 | 5 | 0 |
| 1997 | 7 | 0 |
| 1998 | 2 | 0 |
| 1999 | 9 | 0 |
| 2000 | 11 | 0 |
| 2001 | 8 | 1 |
| 2002 | 8 | 13 |
| 2003 | 11 | 11 |
| 2004 | 4 | 12 |
| 2005 | 3 | 25 |
| 2006 | 10 | 11 |
| 2007 | 8 | 28 |
| 2008 | 13 | 40 |
| 2009 | 3 | 30 |
| 2010 | 13 | 42 |
| 2011 | 16 | 24 |
| 2012 | 24 | 22 |
| 2013 | 26 | 17 |
| 2014 | 20 | 23 |
| 2015 | 11 | 23 |
| 2016 | 21 | 41 |
| 2017 | 20 | 19 |
| 2018 | 13 | 20 |
| 2019 | 30 | 12 |
| 2020 | 17 | 13 |
| 2021 | 16 | 8 |
| 2022 | 3 | 11 |
| 2023 | 6 | 6 |
| 2024 | 9 | 4 |
| 2025 | 7 | 4 |
| 2026 | 3 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Methods for producing optical effect layers comprising magnetic or magnetizable pigment particles and exhibiting one or more indicia28 Jul 2026US 12,692,660 B2Sicpa Holding SA
- Fully micro-optic security document12 May 2026US 12,623,479 B2Crane Co.
- Preparation method of eco-friendly long-lasting heat-sensitive paper13 Jan 2026US 12,522,982 B2Jiangxi Heshuofeng New Material Co., Ltd.
- Method and device for processing an object26 Aug 2025US 12,397,541 B2SWISS KRONO Tec AG
- Microparticle composition comprising an organic IR absorbing pigment5 Aug 2025US 12,378,424 B2BASF SE
- Methods for producing optical effect layers comprising magnetic or magnetizable pigment particles and exhibiting one or more indicia15 Jan 2026US 2026/0015799 A1Sicpa Holding SA
- Lidar reflective black paper and non-woven articles20 Nov 2025US 2025/0354335 A1Toyota Jidosha Kabushiki Kaisha
- Biocidal product with luminescent marker additive for textile surfaces or the like10 Jul 2025US 2025/0221404 A1Ancor TecnolóGica Canaria, S.L.
- Water Resistant Paper and Solution for Producing Same and Building Structure Employing Same15 May 2025US 2025/0154726 A1Agriboard International, LLC
- Luminescent printing ink for security printing, item having luminescent feature, and production method17 Apr 2025US 2025/0122394 A1Giesecke+Devrient Currency Technology GmbH
Most cited
By later US patents
- Method and apparatus for checking the authenticity of documents194US 4,820,912 AN. V. Bekaert S. A. · 1989
- Security paper158US 6,159,585 AGeorgia-Pacific Corporation · 2000
- Security paper with color mark145US 5,449,200 ADomtar Inc. · 1995
- Process and apparatus for applying authenticating coding to value-carrying paper128US 4,740,269 AOesterreichische Nationalbank · 1988
- Security threads125US 5,465,301 APortals (Bathford) Limited · 1995