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US4333984A
Expired / Lapsed
US
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Heat-sensitive recording sheets
Assignee: Fujifilm Holdings Corp
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Filing: 1980-12-18
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Granted: 1982-06-08
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Expires: 2000-12-18
Abstract
Abstract A heat-sensitive recording sheet which comprises a support, a white or light-colored pigment coating layer having an oil absorption determined by JIS K5101 of 75 ml/100 g or more on the support, and a heat-sensitive color forming layer comprising an electron donor colorless dye and an electron acceptor compound on the coating layer.
Inventors
- 👤 Akira Igarashi
- 👤 Hiroharu Matsukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:52
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/40; B41M5/42; B41M5/426; B41M5/44; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
72 words
A heat-sensitive recording sheet which comprises a support, a white or light-colored pigment coating layer having an oil absorption determined by JIS K5101 of 75 ml/100 g or more on the support, and a heat-sensitive color forming layer comprising an electron donor colorless dye and an electron acceptor compound on said coating layer wherein recording occurs due to a color reaction upon melting one or both of said dye and said acceptor.
Claim 2
Dependent Claim
72 words
A heat-sensitive recording sheet which comprises a support, a white or light-colored pigment coating layer having an oil absorption determined by JIS K5101 of 75 ml/100 g or more on the support, and a heat-sensitive color forming layer comprising an electron donor colorless dye and an electron acceptor compound on said coating layer wherein recording occurs due to a color reaction upon melting one or both of said dye and said acceptor.
Claim 3
Dependent Claim
23 words
The heat-sensitive recording sheet according to claim 1, wherein the thickness of the heat-sensitive color forming layer is about 7 μm or less.
Claim 4
Dependent Claim
21 words
The heat-sensitive recording sheet according to claim 1, wherein the support is paper, a synthetic paper or a synthetic resin film.
Claim 5
Dependent Claim
18 words
The heat-sensitive recording sheet according to claim 1, wherein the oil absorption is 100 ml/100 g or more.
Claim 6
Dependent Claim
34 words
The heat-sensitive recording sheet according to claim 1, wherein the pigment is kaolin, calcined kaolin, talc, agalmatolite, diatomaceous earth, calcium carbonate, aluminum hydroxide, magnesium carbonate, magnesium hydroxide, titanium oxide, barium carbonate, or urea-formaldehyde filler.
Claim 7
Dependent Claim
35 words
The heat-sensitive recording sheet of claim 1, wherein said electron donor colorless dye is a triarylmethane compound or a xanthene compound and wherein said electron acceptor compound is a phenol or an aromatic carboxylic acid.
Claim 8
Dependent Claim
26 words
The heat-sensitive recording sheet according to claim 1, wherein said pigment coating layer is coated in an amount of about 1 to 15 g/m 2 .
Claim 9
Dependent Claim
14 words
The heat-sensitive recording sheet according to claim 1, wherein the pigment is calcined kaolin.
Claim 10
Dependent Claim
13 words
The heat-sensitive recording sheet according to claim 1, wherein the pigment is talc.
Claim 11
Dependent Claim
13 words
The heat-sensitive recording sheet according to claim 1, wherein the pigment is agalmatolite.
Claim 12
Dependent Claim
14 words
The heat-sensitive recording sheet according to claim 1, wherein the pigment is diatomaceous earth.
Claim 13
Dependent Claim
14 words
The heat-sensitive recording sheet according to claim 1, wherein the pigment is calcium carbonate.
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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) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |