US3825561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluoran compounds
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1971-10-08
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Granted: 1974-07-23
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Expires: 1991-10-08
Abstract
Abstract NOVEL FLUORAN DERIVATIVES SUCH AS, FOR EXAMPLE, 2-DIALLYLAMINO - 6 - DIETHYLAMINOFLUORAN, 2,2''-IMINOBIS(6-DIETHYLAMINOFLUORAN), 2-(BIS(P - CHLOROBENZYL)AMINO)-6-DIMETHYLAMINOFLUORAN, 2-(O-CHLOROBENZYLAMINO) - 6 - DIETHYLAMINOFLUORAN, AND 2-(N - PHENYL-N-ALLYLAMINO-6-DIMETHYLAMINOFLUORAN. THESE FLUORAN DERIVATIVES ARE USEFUL AS A COLORING MATERIAL FOR RECORD MATERIAL SYSTEMS, SUCH AS PRESSURE-SENSITIVE COPYING PAPER OR HEAT-SENSITIVE COPYING PAPER, WHEREIN COLORED IMAGES FORMED BY AN ELECTRON-DONOR-ACCEPTOR COLOR-FORMING REACTION BETWEEN COLORING MATERIAL AND ACIDIC MATERIAL.
Inventors
- 👤 T Akamatsu
- 👤 M Miyake
- 👤 H Iwasaki
- 👤 K Koga
- 👤 M Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:50
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/24; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/1455; B41M5/26; B41M5/30; B41M5/323; B41M5/327; B41M5/3275
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |