Patent US4868151A successfully refreshed from Google Patents.
US4868151A
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US
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Heat-sensitive recording material
Assignee: Nippon Paper Industries Co Ltd
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Filing: 1987-06-10
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Granted: 1989-09-19
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Expires: 2007-06-10
Abstract
Abstract A heat-sensitive recording material has a support and a color-developing layer which comprises a particular sulfone as an organic color-developing agent and a particular fluorene-type leuco dyestuff as a colorless basic chromogenic dyestuff. This heat-sensitive recording material is superior in light resistance, weather resistance, oil resistance and optical readability in the near infrared region.
Inventors
- 👤 Toshimi Satake
- 👤 Toshiaki Minami
- 👤 Tomoaki Nagai
- 👤 Fumio Fujimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:33
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335; B41M5/3336; B41M5/337; B41M5/3377; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A heat-sensitive recording material comprising a support having thereon a color-developing layer which contains as its ingredient a colorless or pale colored basic chromogenic dyestuff and an organic color-developing agent, said color-developing layer comprising as said organic color-developing agent at least one substance selected from the group consisting of 2,4'-dihydroxydiphenylsulfone and bis-(3-tert.-butyl-4-hydroxy-6-methylphenyl)sulfone and as said colorless basic chromogenic dyestuff 3,6,6'-tris-(dimethylamino)spiro[fluorene-9,3'-phthalide].
Claim 2
Dependent Claim
60 words
A heat-sensitive recording material comprising a support having thereon a color-developing layer which contains as its ingredient a colorless or pale colored basic chromogenic dyestuff and an organic color-developing agent, said color-developing layer comprising as said organic color-developing agent at least one substance selected from the group consisting of 2,4'-dihydroxydiphenylsulfone and bis-(3-tert.-butyl-4-hydroxy-6-methylphenyl)sulfone and as said colorless basic chromogenic dyestuff 3,6,6'-tris-(dimethylamino)spiro[fluorene-9,3'-phthalide].
Claim 3
Dependent Claim
25 words
The heat-snsitive recording material according to claim 1, wherein said color-developing layer comprises said fluorene-type leuco dyestuff and further a black color forming fluoran dyestuff.
Claim 4
Dependent Claim
19 words
The heat-sensitive recording material according to claim 1, wherein said color-developing layer comprises further a halogen-sustituted zinc benzoate derivative.
Claim 5
Dependent Claim
55 words
The heat-sensitive recording material according to claim 1, wherein said color-developing layer comprises 1-8 parts by weight of organic color-developing agent and 1-20 parts by weight of filler, based on 1 part by weight of basic colorless chromogenic dyestuff, and 10-25 parts by weight of binder in 100 parts by weight of total solid content.
Claim 6
Dependent Claim
27 words
The heat-sensitive recording material according to claim 1, wherein said support is at least one member selected from a group consisting of paper, synthetic paper and film.
Claim 7
Dependent Claim
23 words
The heat-sensitive recording material according to claim 1, wherein the back surface of said substrate is laminated with a thin transparent resin film.
Claim 8
Dependent Claim
26 words
The heat-sensitive recording material according to claim 6, wherein said resin film is at least one member selected from a group consisting of polyester and polypropylene.
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) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |