G03G 21/04
Preventing copies being made of an original
G03G21/04 (Preventing copies being made of an original) appears on 477 US grants and 356 published applications in this corpus.
Search patents in G03G- Granted patents
- 477
- Published applications
- 356
- Assignees
- 132
- Inventors
- 851
- Latest grant
- 19 May 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 2 | 0 |
| 1977 | 1 | 0 |
| 1978 | 2 | 0 |
| 1979 | 4 | 0 |
| 1980 | 3 | 0 |
| 1981 | 3 | 0 |
| 1982 | 5 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 4 | 0 |
| 1986 | 8 | 0 |
| 1987 | 1 | 0 |
| 1988 | 9 | 0 |
| 1989 | 3 | 0 |
| 1990 | 7 | 0 |
| 1991 | 2 | 0 |
| 1992 | 7 | 0 |
| 1993 | 9 | 0 |
| 1994 | 12 | 0 |
| 1995 | 17 | 0 |
| 1996 | 14 | 0 |
| 1997 | 16 | 0 |
| 1998 | 26 | 0 |
| 1999 | 13 | 0 |
| 2000 | 17 | 0 |
| 2001 | 11 | 1 |
| 2002 | 7 | 3 |
| 2003 | 6 | 14 |
| 2004 | 4 | 11 |
| 2005 | 5 | 24 |
| 2006 | 10 | 31 |
| 2007 | 7 | 45 |
| 2008 | 7 | 40 |
| 2009 | 19 | 52 |
| 2010 | 23 | 17 |
| 2011 | 37 | 16 |
| 2012 | 27 | 19 |
| 2013 | 32 | 15 |
| 2014 | 26 | 11 |
| 2015 | 13 | 5 |
| 2016 | 8 | 4 |
| 2017 | 4 | 7 |
| 2018 | 6 | 5 |
| 2019 | 4 | 8 |
| 2020 | 9 | 7 |
| 2021 | 9 | 5 |
| 2022 | 3 | 5 |
| 2023 | 3 | 2 |
| 2024 | 2 | 5 |
| 2025 | 4 | 3 |
| 2026 | 1 | 1 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Optical security device based on a surface of revolution19 May 2026US 12,632,002 B2Viavi Solutions Inc.
- Printing system, printing method, and computer-readable medium21 Oct 2025US 12,449,752 B2Ricoh Company, Ltd.
- Image forming apparatus, image forming method, and printed material29 Jul 2025US 12,372,897 B2Ricoh Company, Ltd.
- Optimizing a copy detection pattern to increase copy detecting performance1 Jul 2025US 12,348,692 B2Scantrust SA
- High-contrast electrical connector with machine readable indicia29 Apr 2025US 12,288,112 B2Aptiv Technologies AG
- Authentication of physical objects based on reliable parts of copy detection patterns23 Jul 2026US 2026/0212643 A1
- Image forming apparatus with overwriting of data from photosensitive drum28 Aug 2025US 2025/0271809 A1Hewlett-Packard Development Company, L. P.
- Producing Identity Markers by Electrostatic Printing20 Feb 2025US 2025/0060689 A1DUST Identity, Inc.
- High-contrast electrical connector with machine readable indicia23 Jan 2025US 2025/0028921 A1Aptiv Technologies AG
- Printing system, printing method, and computer-readable medium5 Dec 2024US 2024/0402639 A1Ricoh Company, Ltd.
Most cited
By later US patents
- Electronic copyright royalty accounting system using glyphs463US 5,444,779 AXerox Corporation · 1995
- System for electronically printing plural-color tamper-resistant documents338US 5,291,243 AXerox Corporation · 1994
- Document reproduction security system331US 4,908,873 A1990
- Confidential document reproduction method and apparatus265US 4,739,377 AEastman Kodak Company · 1988
- Printer mailbox system signaling overdue removals of print jobs from mailbox bins256US 5,435,544 AXerox Corporation · 1995