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US4246318A
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US
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Thermally-responsive record material
Assignee: WTA Inc
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Filing: 1979-04-09
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Granted: 1981-01-20
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Expires: 1999-04-09
Abstract
Abstract A thermally sensitive record material is disclosed which comprises chromogenic material which is a mixture of the isomers 7-(1-ethyl-2-methylindol-3-yl)-7-(4-dimethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-5-one and 5-(1-ethyl-2-methylindol-3-yl)-5-(4-diethylamino-2-ethoxyphenyl)-5,7-dihydrofuro[3,4-b]pyridin-7-one. This record material has superior color forming efficiency and greater image stability, especially resistance to fading in incident light.
Inventors
- 👤 Henry H. Baum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:17
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/323; B41M5/327; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31855; Y10T428/31971; Y10T428/31975; Y10T428/31978; Y10T428/31982
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
59 words
A thermally-responsive record material comprising a substrate coated with finely divided solid Pyridyl Blue and a finely divided phenolic material held in contiguous relationship by a binder present in said coating in an amount of about 1 to about 30 weight percent whereby the melting or sublimation of either finely divided material produces a mark-forming reaction upon reactive contact.
Claim 2
Dependent Claim
59 words
A thermally-responsive record material comprising a substrate coated with finely divided solid Pyridyl Blue and a finely divided phenolic material held in contiguous relationship by a binder present in said coating in an amount of about 1 to about 30 weight percent whereby the melting or sublimation of either finely divided material produces a mark-forming reaction upon reactive contact.
Claim 3
Dependent Claim
22 words
The record material of claim 1 in which the phenolic material is selected from the group consisting of 4,4'-isopropylidenediphenol, 4,4'-thiodiphenol and 4-phenylphenol.
Claim 4
Dependent Claim
13 words
The record material of claim 2 in which the phenolic material is 4,4'-isopropylidenediphenol.
Claim 5
Dependent Claim
24 words
The record material of claim 1 in which said binder is present in said coating in an amount of 5 to 30 weight percent.
Claim 6
Dependent Claim
26 words
The record material of claim 1 in which the binder material is selected from the group consisting of poly(vinylalcohol), methylcellulose, methyl-hydroxypropylcellulose, starch, hydroxyethylcellulose and mixtures thereof.
Claim 7
Dependent Claim
18 words
The record material of claim 5 in which the binder material is a mixture of poly(vinylalcohol) and methylcellulose.
Claim 8
Dependent Claim
25 words
The record material of claim 1 in which the Pyridyl Blue is present in said coating in an amount of 0.5 to 10 weight percent.
Claim 9
Dependent Claim
25 words
The record material of claim 7 in which the Pyridyl Blue is present in said coating in an amount of 3 to 6 weight percent.
Claim 10
Dependent Claim
14 words
A thermally-responsive record material in accordance with claim 1, which further comprises a pigment.
Claim 11
Dependent Claim
14 words
A thermally-responsive record material in accordance with claim 9, wherein the pigment is clay.
Claim 12
Dependent Claim
15 words
A thermally-responsive record material in accordance with claim 10, wherein the pigment is kaolin clay.
Claim 13
Dependent Claim
16 words
A thermally-responsive record material in accordance with claim 9, wherein the pigment is urea-formaldehyde resin 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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |