Patent US3864684A successfully refreshed from Google Patents.
US3864684A
Expired / Lapsed
US
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Multicolor electrothermic recording sheet
Assignee: Mitsubishi Paper Mills Ltd
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Filing: 1974-03-22
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Granted: 1975-02-04
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Expires: 1994-03-22
Abstract
Abstract A multicolor electrothermic recording sheet which comprises a support having thereon a layer of a metal compound which can be electrically reduced to a metal or a lower valency metallic compound in a heat sensitive element layer comprising a combination of (1) a polyhydroxy compound or a weak acid compound and (2) a color forming leuco dye which undergoes a color forming reaction upon contact with the polyhydroxy compound or the weak acid compound and a high molecular weight binder, whereby the metal compound is electrically reduced by electrothermic energy to form a metallic color and the leuco dye is thermally developed.
Inventors
- 👤 Kazuo Shimuzu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:06
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/3825; B41M5/20; B41M5/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A MULTICOLOR ELECTROTHERMIC RECORDING SHEET WHICH COMPRISES A SUPPORT HAVING THEREON A LAYER OR A METAL COMPOUND WHICH CAN BE ELECTRICALLY COMPOUND IN A HEAT SENSITIVE ELEMENT LA ENCY METALLIC COMPOUND IN A HEAT SENSITIVE ELEMENT LAYER COMPRISING A COMBINATION OF (1) A POLYHYDROXY COMPOUND OR A WEAK ACID COMPOUND AND (2) A COLOR FORMING LEUCO DYE WHICH UNDERGOES A COLOR FORMING REACTION UPON CONTACT WITH SAID POLYHYDROXY COMPOUND OR SAID WEAK ACID COMPOUND AND A HIGH MOLECULAR WEIGHT BINDER, WHEREBY SAID METAL COMPOUND IS ELECTRICALLY REDUCED BY ELECTROTHERMIC ENERGY TO FORM A METALLIC COLOR AND SAID LEUCO DYE IS THERMALLY DEVELOPED.
Claim 2
Dependent Claim
102 words
A MULTICOLOR ELECTROTHERMIC RECORDING SHEET WHICH COMPRISES A SUPPORT HAVING THEREON A LAYER OR A METAL COMPOUND WHICH CAN BE ELECTRICALLY COMPOUND IN A HEAT SENSITIVE ELEMENT LA ENCY METALLIC COMPOUND IN A HEAT SENSITIVE ELEMENT LAYER COMPRISING A COMBINATION OF (1) A POLYHYDROXY COMPOUND OR A WEAK ACID COMPOUND AND (2) A COLOR FORMING LEUCO DYE WHICH UNDERGOES A COLOR FORMING REACTION UPON CONTACT WITH SAID POLYHYDROXY COMPOUND OR SAID WEAK ACID COMPOUND AND A HIGH MOLECULAR WEIGHT BINDER, WHEREBY SAID METAL COMPOUND IS ELECTRICALLY REDUCED BY ELECTROTHERMIC ENERGY TO FORM A METALLIC COLOR AND SAID LEUCO DYE IS THERMALLY DEVELOPED.
Claim 3
Dependent Claim
13 words
The recording sheet of claim 1, wherein said polyhydroxy compound is a dihydroxyphenol.
Claim 4
Dependent Claim
15 words
The recording sheet of claim 1, wherein said weak acid compound is an organic acid.
Claim 5
Dependent Claim
18 words
The recording sheet of claim 1, wherein said leuco dye is a leuco dye containing a lactone ring.
Claim 6
Dependent Claim
21 words
The recording sheet of claim 1, wherein said metal compound is a compound of a metal in a low oxidation state.
Claim 7
Dependent Claim
15 words
The recording sheet of claim 5, wherein said metal compound is an oxide or hydroxide.
Claim 8
Dependent Claim
24 words
The recording sheet of claim 6, wherein said metal compound is zinc oxide, lead oxide, antimony oxide, zinc hydroxide, barium hydroxide, or barium sulfate.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |