D21H 21/44
Latent security elements, i.e. detectable or becoming apparent only by use of
Official title: Latent security elements, i.e. detectable or becoming apparent only by use of special verification or tampering devices or methods
D21H21/44 (Latent security elements, i.e. detectable or becoming apparent only by use of) appears on 287 US grants and 262 published applications in this corpus.
Search patents in D21H- Granted patents
- 287
- Published applications
- 262
- Assignees
- 186
- Inventors
- 570
- Latest grant
- 28 Jul 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 4 | 0 |
| 1984 | 10 | 0 |
| 1985 | 4 | 0 |
| 1986 | 5 | 0 |
| 1987 | 7 | 0 |
| 1988 | 5 | 0 |
| 1989 | 4 | 0 |
| 1990 | 7 | 0 |
| 1991 | 7 | 0 |
| 1992 | 8 | 0 |
| 1993 | 8 | 0 |
| 1994 | 4 | 0 |
| 1995 | 5 | 0 |
| 1996 | 2 | 0 |
| 1997 | 3 | 0 |
| 1998 | 0 | 0 |
| 1999 | 1 | 0 |
| 2000 | 7 | 0 |
| 2001 | 4 | 0 |
| 2002 | 2 | 6 |
| 2003 | 6 | 7 |
| 2004 | 3 | 6 |
| 2005 | 2 | 14 |
| 2006 | 6 | 7 |
| 2007 | 7 | 15 |
| 2008 | 7 | 23 |
| 2009 | 3 | 14 |
| 2010 | 5 | 21 |
| 2011 | 9 | 11 |
| 2012 | 15 | 15 |
| 2013 | 13 | 11 |
| 2014 | 11 | 17 |
| 2015 | 8 | 13 |
| 2016 | 15 | 31 |
| 2017 | 11 | 10 |
| 2018 | 9 | 6 |
| 2019 | 20 | 9 |
| 2020 | 8 | 8 |
| 2021 | 9 | 4 |
| 2022 | 2 | 6 |
| 2023 | 4 | 4 |
| 2024 | 5 | 2 |
| 2025 | 5 | 1 |
| 2026 | 1 | 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
- 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
- Electrically conductive paper structure, method for manufacturing same and use17 Jun 2025US 12,331,464 B2Giesecke+Devrient Currency Technology GmbH
- Multi-layer printing substrate with hidden information18 Mar 2025US 12,252,846 B2Landqart
- 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
- Water Resistant Paper and Solution for Producing Same and Building Structure Employing Same15 May 2025US 2025/0154726 A1Agriboard International, LLC
- Diffractive Structures Within Polymer Substrates, Their Manufacture and Use8 Aug 2024US 2024/0262124 A1Bank of Canada
- Method and device for processing an object11 Jan 2024US 2024/0009993 A1SWISS KRONO Tec AG
- Paper substrates incorporating covert marking pigments, and processes for obtaining and using same14 Dec 2023US 2023/0399800 A1International Paper Company
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
- Security threads125US 5,465,301 APortals (Bathford) Limited · 1995
- Security papers124US 4,183,989 APortals Limited · 1980