US4558335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoresponsive recording sheet
Assignee: API Corp
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Filing: 1982-03-11
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Granted: 1985-12-10
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Expires: 2002-03-11
Abstract
Abstract There is disclosed the use of benzyl 4-benzyloxybenzoate as a responsiveness-increasing agent in a thermoresponsive recording paper sheet comprising a normally colorless or pale-colored chromogenic substance in combination with a phenolic compound.
Inventors
- 👤 Naoki Hanayama
- 👤 Eisaburo Kaku
- 👤 Ryoichi Kinishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:11
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/337
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
47 words
A thermoresponsive recording paper sheet comprising a paper substrate and a thermoresponsive recording layer on said substrate, wherein said thermoresponsive recording layer comprises at least one normally colorless or pale-colored chromogenic substance in combination with at least one phenolic compound and benzyl 4-benzyl-oxybenzoate as a responsiveness-increasing agent.
Claim 2
Dependent Claim
47 words
A thermoresponsive recording paper sheet comprising a paper substrate and a thermoresponsive recording layer on said substrate, wherein said thermoresponsive recording layer comprises at least one normally colorless or pale-colored chromogenic substance in combination with at least one phenolic compound and benzyl 4-benzyl-oxybenzoate as a responsiveness-increasing agent.
Claim 3
Dependent Claim
15 words
A thermoresponsive recording paper sheet according to claim 1, wherein the phenolic compound is 4,4'-isopropylidenediphenol.
Claim 4
Dependent Claim
16 words
A thermoresponsive recording paper sheet according to claim 1, wherein the phenolic compound is benzyl 4-hydroxybenzoate.
Claim 5
Dependent Claim
17 words
A thermoresponsive recording paper sheet according to claim 1, wherein the chromogenic substance is a fluoran compound.
Claim 6
Dependent Claim
15 words
A thermoresponsive recording paper sheet according to claim 4, wherein the fluoran compound is 3-diethylamino-6-methyl-7-anilinofluoran.
Claim 7
Dependent Claim
17 words
A thermoresponsive recording paper sheet according to claim 1, wherein the chromogenic substance is crystal violet lactone.
References Cited (Backward Citations)
US3539375A
Cited
GB1531121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |