Patent US4168845A successfully refreshed from Google Patents.
US4168845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive record material
Assignee: New Oji Paper Co Ltd
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Filing: 1978-01-05
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Granted: 1979-09-25
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Expires: 1998-01-05
Abstract
Abstract In a heat-sensitive record material comprising a base sheet and a color developing layer formed thereon, a pigment having an oil absorption within the range of 80 to 800 ml/100 g is additionally included in the color developing layer.
Inventors
- 👤 Yoshitaka Oeda
- 👤 Takeshi Murakami
- 👤 Hiroo Hayashi
- 👤 Teruo Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:23
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337; B41M5/3377; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/165; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/27; Y10T428/273; Y10T428/277
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
In a heat-sensitive record material comprising a base sheet and a color developing layer formed on at least one surface of said base sheet, said color developing layer comprising colorless chromogenic material and acceptor which is reactive with said colorless chromogenic material to develop a color, the improvement in said color developing layer further including pigment having an oil absorption within the range of 80 to 800 ml/100 g, in which said pigment is finely divided silicon dioxide.
Claim 2
Dependent Claim
78 words
In a heat-sensitive record material comprising a base sheet and a color developing layer formed on at least one surface of said base sheet, said color developing layer comprising colorless chromogenic material and acceptor which is reactive with said colorless chromogenic material to develop a color, the improvement in said color developing layer further including pigment having an oil absorption within the range of 80 to 800 ml/100 g, in which said pigment is finely divided silicon dioxide.
Claim 3
Dependent Claim
54 words
A heat-sensitive record material as defined in claim 1, in which the coating amount of said color developing layer is within the range of 1 to 15 g/m 2 on dry basis and said pigment is included in said color developing layer in an amount within the range of 5 to 80% by weight.
Claim 4
Dependent Claim
51 words
A heat-sensitive record material as defined in claim 2, in which the coating amount of said color developing layer is within the range of 2 to 9 g/m 2 on dry basis and said pigment is included in said color developing layer in an amount of 10 to 65% by weight.
Claim 5
Dependent Claim
48 words
A heat-sensitive record material as defined in claim 1, in which said color developing layer is formed by forming at least one surface of said base sheet a coating layer comprising said colorless chromogenic material and said acceptor and then superposing thereon a coating layer including said pigment.
Claim 6
Dependent Claim
60 words
A heat sensitive record material as defined in claim 4, in which the coating amount of said coating layer comprising said colorless chromogenic material and said acceptor is 1 to 15 g/m 2 on dry basis and the coating amount of said coating layer including said pigment is within the range of 1 to 15 g/m 2 on dry basis.
Claim 7
Dependent Claim
58 words
A heat-sensitive record material as defined in claim 5, in which the coating amount of said coating layer comprising said colorless chromogenic material and said acceptor is within 2 to 10 g/m 2 on dry basis and the coating amount of said coating layer including said pigment is within the range of 2 to 9 g/m 2 .
Claim 8
Dependent Claim
49 words
A heat-sensitive record material as defined in claim 1, in which said color developing layer is formed by forming on at least one surface of said base sheet a coating layer including said pigment and then superposing thereon a coating layer comprising said colorless chromogenic material and said acceptor.
Claim 9
Dependent Claim
63 words
A heat-sensitive record material as defined in claim 7, in which the coating amount of said coating layer including said pigment is within the range of 1 to 20 g/m 2 on dry basis and the coating amount of said coating layer comprising said colorless chromogenic material and said acceptor is within the range of 1 to 15 g/m 2 on dry basis.
Claim 10
Dependent Claim
63 words
A heat-sensitive record material as defined in claim 8, in which the coating amount of said coating layer including said pigment is within the range of 5 to 10 g/m 2 on dry basis and the coating amount of said coating layer comprising said colorless chromogenic material and said acceptor is within the range of 2 to 9 g/m 2 on dry basis.
Claim 11
Dependent Claim
41 words
A heat-sensitive record material as defined in claim 1, in which said color developing layer is formed by coating on at least one surface of said base sheet a coating composition comprising said colorless chromogenic material, said acceptor and said pigment.
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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |