Patent US4613879A successfully refreshed from Google Patents.
US4613879A
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US
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Chromogenic recording materials
Assignee: Nippon Soda Co Ltd
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Filing: 1984-04-18
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Granted: 1986-09-23
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Expires: 2004-04-18
Abstract
Abstract This invention relates to chromogenic recording materials comprising as a chromogenic substance 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran of the following formula (I) ##STR1##
Inventors
- 👤 Masakichi Yahagi
- 👤 Tetsuo Igaki
- 👤 Sinzi Yoshinaka
- 👤 Kousaku Morita
- 👤 Morikuni Saito
- 👤 Kimiaki Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:33
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10; 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
Total Claims: 10
Claim 1
Independent Claim
33 words
A chromogenic recording material comprising 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran, an acidic substance capable of causing the color formation of said fluoran compound and a substrate which supports the fluoran compound the acidic substance on its surface.
Claim 2
Dependent Claim
33 words
A chromogenic recording material comprising 3-N-isobutylethylamino-6-methyl-7-phenylaminofluoran, an acidic substance capable of causing the color formation of said fluoran compound and a substrate which supports the fluoran compound the acidic substance on its surface.
Claim 3
Dependent Claim
18 words
The chromogenic recording material according to claim 1, wherein said chromogenic recording material is a pressure-sensitive copying paper.
Claim 4
Dependent Claim
18 words
The chromogenic recording material according to claim 1, wherein said chromogenic recording material is a heat-sensitive recording paper.
Claim 5
Dependent Claim
15 words
The chromogenic recording material according to claim 3, wherein the acidic substance is bisphenol A.
Claim 6
Dependent Claim
15 words
The chromogenic recording material according to claim 3, wherein the acidic substance is benzyl 4-hydroxybenzoate.
Claim 7
Dependent Claim
15 words
The chromogenic recording material according to claim 3, wherein the acidic substance is 4-hydroxy-4-methyldiphenyl sulfone.
Claim 8
Dependent Claim
15 words
The chromogenic recording material according to claim 3, wherein the acidic substance is 4-hydroxy-4'-isopropoxydiphenyl sulfone.
Claim 9
Dependent Claim
20 words
The chromogenic recording material according to any one of claims 3 to 7, further comprising dibenzyl terephthalate as a sensitizer.
Claim 10
Dependent Claim
20 words
The chromogenic recording material according to any one of claims 3 to 7, further comprising dibenzyl isophthalate as a sensitizer.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |