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US4339492A
Expired / Lapsed
US
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Heat-sensitive recording material
Assignee: Sanyo Kokusaku Pulp Co Ltd
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Filing: 1980-06-05
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Granted: 1982-07-13
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Expires: 2000-06-05
Abstract
Abstract A heat-sensitive recording material having a heat-sensitive layer composed mainly of a leuco dye, a phenolic compound and a water-soluble binding agent is characterized in that a combination of bisphenol A and p-phenylphenol is applied as the developer in a ratio by weight between 10:1 and 1:1, preferably 7:1 and 1:1.
Inventors
- 👤 Hisashi Mino
- 👤 Masao Matsukawa
- 👤 Minematsu Nagashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:09
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A heat-sensitive recording material having a heat-sensitive layer comprising a leuco dye, a phenolic compound and a water-soluble binding agent, wherein said phenolic compound comprises bisphenol A and p-phenylphenol in a ratio by weight between 8:1 and 4:3.
Claim 2
Dependent Claim
38 words
A heat-sensitive recording material having a heat-sensitive layer comprising a leuco dye, a phenolic compound and a water-soluble binding agent, wherein said phenolic compound comprises bisphenol A and p-phenylphenol in a ratio by weight between 8:1 and 4:3.
References Cited (Backward Citations)
US3539375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |