US3925416A
Expired / Lapsed
US
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Benz{8 c{9 fluoran compounds and recording sheet containing the same
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1974-06-27
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Granted: 1975-12-09
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Expires: 1994-06-27
Abstract
Abstract Novel benz(c)fluoran compounds such as 2-amino-8dimethylaminobenz(c)fluoran and N,N''-o-xylylene-bis-(2-amino-8dimethylbenz(c)fluoran), which 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
- 👤 Takashi Akamatsu
- 👤 Koichi Koga
- 👤 Mitsuru Kondo
- 👤 Makoto Miyake
- 👤 Hiroshi Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:39
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; C07; C07D; C07D493/00; C07D493/02; C07D493/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
6 words
A compound represented by the formula,
Claim 4
Dependent Claim
6 words
A compound represented by the formula,
Claim 5
Dependent Claim
6 words
A compound represented by the formula,
Claim 6
Dependent Claim
6 words
A compound represented by the formula,
Claim 7
Dependent Claim
6 words
A compound represented by the formula,
Claim 8
Dependent Claim
6 words
A compound represented by the formula,
Claim 9
Dependent Claim
6 words
A compound represented by the formula,
Claim 10
Dependent Claim
6 words
A compound represented by the formula,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |