Patent US5547500A successfully refreshed from Google Patents.
US5547500A
Expired / Lapsed
US
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Reversible thermal coloring compositions, and recording media and methods using the same
Assignee: Ricoh Co Ltd
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Filing: 1995-03-23
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Granted: 1996-08-20
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Expires: 2015-03-23
Abstract
Abstract The reversible thermal coloring composition of the present invention comprises a leuco compound, a salt or complex salt obtained by the reaction of an acidic substance A and a basic substance, and an acidic substance B. The acidic substance A is identical with the acidic substance B.
Inventors
- 👤 Kyohji Tsutsui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:06
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/30; B41M5/305; B41M5/323
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
43 words
A reversible thermal coloring composition comprising (1) a leuco compound, (2) a salt or complex salt of an acidic substance A with a basic substance, and (3) an acidic substance B, wherein the acidic substance A is identical with the acidic substance B.
Claim 2
Dependent Claim
43 words
A reversible thermal coloring composition comprising (1) a leuco compound, (2) a salt or complex salt of an acidic substance A with a basic substance, and (3) an acidic substance B, wherein the acidic substance A is identical with the acidic substance B.
Claim 3
Dependent Claim
22 words
The reversible thermal coloring composition of claim 1, wherein the acidic substance has an alkyl group having 10 or more carbon atoms.
Claim 4
Dependent Claim
24 words
The reversible thermal coloring composition of claim 1 or 2, wherein the acidic substance is a polybasic acid having two or more carboxyl groups.
Claim 5
Dependent Claim
28 words
The reversible thermal coloring composition of claim 1 or 2, wherein the basic substance has an alkyl group having 10 or more carbon atoms and an amino group.
Claim 6
Dependent Claim
26 words
The reversible thermal coloring composition of claim 3, wherein the basic substance has an alkyl group having 10 or more carbon atoms and an amino group.
Claim 7
Dependent Claim
32 words
A recording medium having a recording layer on a support wherein the recording layer comprises the reversible thermal coloring composition of any one of claims 1 to 5 and a binder resin.
Claim 8
Dependent Claim
58 words
A method for reversible recording comprising a coloring step wherein the recording medium of claim 6 is heated at a temperature within the coloring temperature range of said reversible thermal coloring composition, which is lower than its decoloring temperature, and a decoloring step wherein said recording medium is heated at a temperature higher than said coloring temperature range.
Claim 9
Dependent Claim
72 words
A method for reversible recording comprising a coloring step wherein the whole surface of the recording medium of claim 6 is heated at a coloring temperature of the reversible thermal coloring composition, and a decoloring step wherein a part of the surface of said recording medium is imagewise heated at a temperature within the decoloring temperature range of said coloring composition, which is lower than the coloring temperature, and then cooled rapidly.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |