US4590498A
Expired / Lapsed
US
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Chromogenic recording materials
Assignee: Nippon Soda Co Ltd
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Filing: 1984-02-23
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Granted: 1986-05-20
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Expires: 2004-02-23
Abstract
Abstract Chromogenic recording materials which utilizes a fluoran compound of the formula ##STR1## wherein R is methyl or ethyl, is described.
Inventors
- 👤 Masakichi Yahagi
- 👤 Tetsuo Igaki
- 👤 Sinzi Yosinaka
- 👤 Kousaku Morita
- 👤 Morikuni Saito
- 👤 Kimiaki Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:04
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; B41M5/333; B41M5/3333; B41M5/3335; B41M5/337; B41M5/3375; C07; C07D; C07D493/00; C07D493/02; C07D493/10; B41M5/3336
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
47 words
A chromogenic material which comprises a fluoran compound of the formula ##STR9## wherein R represents a methyl or ethyl group, an acidic material capable of causing color formation of said fluoran compound and a substrate which supports the fluoran compound and the acidic substance on its surface.
Claim 2
Dependent Claim
47 words
A chromogenic material which comprises a fluoran compound of the formula ##STR9## wherein R represents a methyl or ethyl group, an acidic material capable of causing color formation of said fluoran compound and a substrate which supports the fluoran compound and the acidic substance on its surface.
Claim 3
Dependent Claim
17 words
The chromogenic recording material of claim 1 wherein the chromogenic recording material is a heat-sensitive recording paper.
Claim 4
Dependent Claim
17 words
The chromogenic recording material of claim 1 wherein the chromogenic recording material is a pressure-sensitive copying paper.
Claim 5
Dependent Claim
14 words
The chromogenic recording material of claim 1 comprising bisphenol A as an acidic substance.
Claim 6
Dependent Claim
14 words
The chromogenic recording material of claim 1 comprising benzyl 4-hydroxybenzoate as the acidic substance.
Claim 7
Dependent Claim
15 words
The chromogenic recording material of claim 1 comprising 4-hydroxy-4'-methyl diphenyl sulfone as the acidic substance.
Claim 8
Dependent Claim
14 words
The chromogenic recording material of claim 1 comprising diphenylmethyl 4-hydroxybenzoate as the acidic substance.
Claim 9
Dependent Claim
13 words
The chromogenic recording material of claim 1 comprising 4-hydroxy-4'-isopropoxydiphenylsulfone as the acidic substance.
Claim 10
Dependent Claim
13 words
The chromogenic recording material of claim 1 comprising 4-hydroxy-4'-n-butoxydiphenylsulfone as the acidic substance.
Claim 11
Dependent Claim
24 words
The chromogenic recording material of any one of claims 2, 4, 5, 6, 7, 8 or 9 further comprising dibenzyl terephthalate as a sensitizer.
Claim 12
Dependent Claim
24 words
The chromogenic recording material of any one of claims 2, 4, 5, 6, 7, 8 or 9 further comprising dibenzyl isophthalate as a sensitizer.
Claim 13
Dependent Claim
23 words
The chromogenic recording material of any one of claims 2, 4, 5, 6, 7, 8 or 9 further comprising 4,4'-di-n-butoxydiphenylsulfone as a sensitizer.
Claim 14
Dependent Claim
23 words
The chromogenic recording material of any one of claims 2, 4, 5, 6, 7, 8 or 9 further comprising 4,4'-di-n-pentyloxydiphenylsulfone as a sensitizer.
References Cited (Backward Citations)
US2548366A
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US2800458A
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US3681390A
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JPS4896137A
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JPS5610193A
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JPS58208092A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |