B41M 5/323
Organic colour formers
Official title: Organic colour formers, e.g. leuco dyes
B41M5/323 (Organic colour formers) appears on 760 US grants and 371 published applications in this corpus.
Search patents in B41M- Granted patents
- 760
- Published applications
- 371
- Assignees
- 161
- Inventors
- 957
- Latest grant
- 4 Aug 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 11 | 0 |
| 1977 | 19 | 0 |
| 1978 | 12 | 0 |
| 1979 | 9 | 0 |
| 1980 | 17 | 0 |
| 1981 | 20 | 0 |
| 1982 | 17 | 0 |
| 1983 | 11 | 0 |
| 1984 | 15 | 0 |
| 1985 | 26 | 0 |
| 1986 | 22 | 0 |
| 1987 | 31 | 0 |
| 1988 | 22 | 0 |
| 1989 | 41 | 0 |
| 1990 | 26 | 0 |
| 1991 | 31 | 0 |
| 1992 | 26 | 0 |
| 1993 | 33 | 0 |
| 1994 | 19 | 0 |
| 1995 | 22 | 0 |
| 1996 | 9 | 0 |
| 1997 | 13 | 0 |
| 1998 | 12 | 0 |
| 1999 | 7 | 0 |
| 2000 | 14 | 0 |
| 2001 | 7 | 2 |
| 2002 | 8 | 4 |
| 2003 | 7 | 18 |
| 2004 | 9 | 17 |
| 2005 | 12 | 11 |
| 2006 | 9 | 12 |
| 2007 | 13 | 19 |
| 2008 | 3 | 16 |
| 2009 | 8 | 9 |
| 2010 | 3 | 8 |
| 2011 | 5 | 11 |
| 2012 | 5 | 7 |
| 2013 | 12 | 17 |
| 2014 | 22 | 18 |
| 2015 | 12 | 14 |
| 2016 | 15 | 20 |
| 2017 | 19 | 14 |
| 2018 | 17 | 22 |
| 2019 | 17 | 14 |
| 2020 | 8 | 25 |
| 2021 | 8 | 21 |
| 2022 | 14 | 17 |
| 2023 | 9 | 14 |
| 2024 | 17 | 18 |
| 2025 | 12 | 16 |
| 2026 | 4 | 7 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Subgroups
Granted patents
Recent patents
- Composition4 Aug 2026US 12,697,831 B2Datalase Ltd.
- Thermosensitive recording layer forming liquid, thermosensitive recording medium and production method thereof, and image recording method12 May 2026US 12,623,478 B2Ricoh Company, Ltd.
- Direct thermal recording media with diarylurea combinations for oil resistance10 Feb 2026US 12,545,045 B2Appvion, Inc.
- Heat-sensitive recording body20 Jan 2026US 12,528,307 B2Oji Holdings Corporation
- Drawing system and drawing method11 Nov 2025US 12,466,196 B2Sony Group Corporation
- Image forming method and image forming apparatus8 Oct 2026US 2026/0307414 A1Brother Kogyo Kabushiki Kaisha
- Composition20 Aug 2026US 2026/0241736 A1Datalase Ltd.
- Thermal recording material30 Apr 2026US 2026/0116113 A1Osaka Sealing Printing Co., Ltd.
- Reversibly thermochromic composition, reversibly thermochromic microcapsule pigment encapsulating reversibly thermochromic composition, and writing instrument using reversibly thermochromic microcapsule pigment5 Mar 2026US 2026/0062580 A1KABUSHIKI KAISHA PILOT CORPORATION (also trading as PILOT CORPORATION)
- Heat-sensitive recording medium1 Jan 2026US 2026/0001368 A1Osaka Sealing Printing Co., Ltd.
Most cited
By later US patents
- Optical storage identification card and read/write system234US 4,663,518 APolaroid Corporation · 1987
- Thermal imaging method148US 4,602,263 APolaroid Corporation · 1986
- Thermal imaging method121US 4,720,449 APolaroid Corporation · 1988
- Thermal imaging method81US 4,720,450 APolaroid Corporation · 1988
- Color-shifted dyes with thermally unstable carbamate moiety comprising T-alkoxycarbonyl group81US 4,826,976 APolaroid Corporation · 1989