D21F 1/44
Watermarking devices
D21F1/44 (Watermarking devices) appears on 58 US grants and 55 published applications in this corpus.
Search patents in D21F- Granted patents
- 58
- Published applications
- 55
- Assignees
- 39
- Inventors
- 130
- Latest grant
- 11 Jun 2024
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1979 | 2 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 2 | 0 |
| 1986 | 1 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 1 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 5 | 0 |
| 2000 | 1 | 0 |
| 2001 | 3 | 1 |
| 2002 | 3 | 4 |
| 2003 | 3 | 3 |
| 2004 | 2 | 3 |
| 2005 | 1 | 4 |
| 2006 | 3 | 3 |
| 2007 | 0 | 0 |
| 2008 | 4 | 3 |
| 2009 | 0 | 5 |
| 2010 | 0 | 3 |
| 2011 | 3 | 3 |
| 2012 | 3 | 1 |
| 2013 | 5 | 3 |
| 2014 | 4 | 1 |
| 2015 | 0 | 1 |
| 2016 | 0 | 1 |
| 2017 | 2 | 4 |
| 2018 | 1 | 2 |
| 2019 | 1 | 1 |
| 2020 | 3 | 3 |
| 2021 | 0 | 1 |
| 2022 | 1 | 0 |
| 2023 | 0 | 3 |
| 2024 | 1 | 1 |
| 2025 | 0 | 0 |
| 2026 | 0 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Paper forming mold, mold manufacturing method, and paper manufactured by forming mold11 Jun 2024US 12,006,629 B2Chengdu Banknote Printing Co., Ltd
- Device for generating a pattern on a clothing for a machine for manufacturing a web material11 Oct 2022US 11,465,405 B2Voith Patent GmbH
- Watermark sheet, apparatus, and document, and methods for providing the same24 Nov 2020US 10,843,500 B2Crane Co.
- Paper including one or more multi-tonal watermarks having full tonality, and an improved watermarking tool for manufacturing such paper6 Oct 2020US 10,794,005 B2Crane Co.
- Watermarking28 Apr 2020US 10,632,780 B2Portals De La Rue Limited
- Security document with functional watermark and methods for making same9 Jul 2026US 2026/0192589 A1Crane Co.
- Micro-optic security device with enhanced wet-harvest resistance29 Aug 2024US 2024/0287739 A1Crane Co.
- Method for producing a green paper for producing a gas diffusion layer for a fuel cell21 Dec 2023US 2023/0411632 A1Giesecke+Devrient Currency Technology GmbH
- Method for producing a green paper for producing a gas diffusion layer for a fuel cell5 Oct 2023US 2023/0317974 A1Giesecke+Devrient Currency Technology GmbH
- Paper forming mold, mold manufacturing method, and paper manufactured by forming mold9 Feb 2023US 2023/0037506 A1Chengdu Banknote Printing Co., Ltd
Most cited
By later US patents
- Wet crepe, impingement-air dry process for making absorbent sheet110US 6,432,267 B1Georgia-Pacific Corporation · 2002
- Security paper73US 4,534,398 ACrane Co. · 1985
- Method for the manufacture of security paper72US 5,871,615 AThe Wiggins Teape Group Limited · 1999
- Process for making and detecting anti-counterfeit paper58US 6,045,656 AWestvaco Corporation · 2000
- Making paper45US 6,616,803 B1De La Rue International Limited · 2003