Patent US4511910A successfully refreshed from Google Patents.
US4511910A
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Thermosensitive recording material
Assignee: Ricoh Co Ltd
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Filing: 1984-04-12
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Granted: 1985-04-16
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Expires: 2004-04-12
Abstract
Abstract A thermosensitive recording material is disclosed, which comprises a colorless or light-colored coloring material, and a color developer capable of inducing color formation in the colorless or light-colored coloring material upon application of heat thereto, in which the color developer is a phenolic material of the formula <IMAGE> wherein R represents an straight-chain or branched alkylene group having at least one hydroxyl group.
Inventors
- 👤 Keishi Taniguchi
- 👤 Kiyotaka Iiyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:59
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/333; B41M5/3333; B41M5/3335; B41M5/3336
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
62 words
In a thermosensitive recording material comprising a colorless or light-colored coloring material, and a color developer capable of inducing color formation in said colorless or light-colored coloring material upon application of heat thereto, the improvement wherein said color developer is a phenolic material of the formula ##STR16## wherein R represents an straight-chain or branched alkylene group having at least one hydroxyl group.
Claim 2
Dependent Claim
62 words
In a thermosensitive recording material comprising a colorless or light-colored coloring material, and a color developer capable of inducing color formation in said colorless or light-colored coloring material upon application of heat thereto, the improvement wherein said color developer is a phenolic material of the formula ##STR16## wherein R represents an straight-chain or branched alkylene group having at least one hydroxyl group.
Claim 3
Dependent Claim
62 words
A therosensitive recording material as claimed in claim 1, wherein said colorless or light-colored coloring material is a fluoran compound of the formula ##STR17## wherein R 1 and R 2 each represent an alkyl group having 1 to 6 carbon atoms; R 3 represents an alkyl group having 1 to 2 carbon atoms; and n is an integer of 0 or 1.
Claim 4
Dependent Claim
37 words
A thermosensitive recording material as claimed in claim 1, wherein said colorless or light-colored coloring material and said color developer are contained, together with a binder agent, in a thermosensitive recording layer formed on a support material.
Claim 5
Dependent Claim
44 words
A thermosensitive recording material as claimed in claim 1, wherein said colorless or light-colored coloring material is supported by a first binder agent on a first support material; and said color developer is supported by a second binder agent on a second support material.
Claim 6
Dependent Claim
30 words
A thermosensitive recording material as claimed in claim 1, wherein the amount of said color developer is 1 to 6 times the amount of said colorless or light-colored coloring material.
References Cited (Backward Citations)
JPS5739987A
Cited
JPS57151394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |