B42D 25/328
Diffraction gratings
Official title: Diffraction gratings; Holograms
B42D25/328 (Diffraction gratings) appears on 1,083 US grants and 1,278 published applications in this corpus.
Search patents in B42D- Granted patents
- 1,083
- Published applications
- 1,278
- Assignees
- 418
- Inventors
- 1,625
- Latest grant
- 22 Sep 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 3 | 0 |
| 1980 | 1 | 0 |
| 1981 | 2 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 6 | 0 |
| 1987 | 4 | 0 |
| 1988 | 3 | 0 |
| 1989 | 5 | 0 |
| 1990 | 6 | 0 |
| 1991 | 8 | 0 |
| 1992 | 8 | 0 |
| 1993 | 5 | 0 |
| 1994 | 7 | 0 |
| 1995 | 9 | 0 |
| 1996 | 10 | 0 |
| 1997 | 16 | 0 |
| 1998 | 27 | 0 |
| 1999 | 15 | 0 |
| 2000 | 14 | 0 |
| 2001 | 14 | 3 |
| 2002 | 18 | 19 |
| 2003 | 10 | 27 |
| 2004 | 20 | 34 |
| 2005 | 16 | 38 |
| 2006 | 22 | 33 |
| 2007 | 13 | 57 |
| 2008 | 15 | 52 |
| 2009 | 18 | 50 |
| 2010 | 35 | 45 |
| 2011 | 33 | 43 |
| 2012 | 38 | 52 |
| 2013 | 36 | 51 |
| 2014 | 38 | 56 |
| 2015 | 39 | 59 |
| 2016 | 39 | 49 |
| 2017 | 40 | 79 |
| 2018 | 55 | 87 |
| 2019 | 76 | 76 |
| 2020 | 72 | 81 |
| 2021 | 66 | 72 |
| 2022 | 48 | 61 |
| 2023 | 34 | 48 |
| 2024 | 52 | 51 |
| 2025 | 54 | 27 |
| 2026 | 22 | 28 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
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- Optical devices and methods of manufacture thereof4 Aug 2026US 12,697,833 B2De La Rue International Limited
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- Compositions, comprising silver nanoplatelets8 Oct 2026US 2026/0307149 A1BASF SE
- Optical security components, manufacture of such components and secure objects provided with such components8 Oct 2026US 2026/0307422 A1Surys
- Security document verification apparatus and method for examining a security document1 Oct 2026US 2026/0301356 A1Veridos GmbH
- Precision watermarking of covert and overt authentication features24 Sep 2026US 2026/0285077 A1Crane Co.
- Optical Anti-Counterfeiting Element and Optical Anti-Counterfeiting Product17 Sep 2026US 2026/0273986 A1China Banknote Printing and Minting Corp.
Most cited
By later US patents
- Audio- and graphics-based linking to internet352US 6,286,036 B1Digimarc Corporation · 2001
- Transparent reflection-type340US 4,856,857 ADai Nippon Insatsu Kabushiki Kaisha · 1989
- Credit card with magnifying lens334US 5,608,203 A1997
- Transaction card262US 6,581,839 B1American Express Travel Related Services Company, Inc. · 2003
- Anticounterfeiting method and device utilizing holograms and pseudorandom dot patterns252US 5,396,559 A1995