Patent US4529993A successfully refreshed from Google Patents.
US4529993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat sensitive transfer medium
Assignee: Ricoh Co Ltd
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Filing: 1984-06-06
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Granted: 1985-07-16
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Expires: 2004-06-06
Abstract
Abstract The heat sensitive transfer medium according to the present invention is characterized in that it comprises a transfer sheet having a transfer layer consisted essentially of a leuco-dye color former and a receiving sheet having a receiving layer consisted essentially of a developer for said leuco-dye and a binder and that said transfer layer further contains 0.01 to 1 part by weight of polyester resin which has a melting point of 50 DEG to 130 DEG C. and a repetition unit represented by the formula: <IMAGE> together with 0.01 to 1 part by weight of a porous filler which has an oil absorption of 50 ml or more/100 g, respectively per part by weight of said leuco-dye.
Inventors
- 👤 Hideo Watanabe
- 👤 Nobuhiro Takigawa
- 👤 Minoru Hakiri
- 👤 Kanjirou Kawasaki
- 👤 Keishi Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:10
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38235; B41M5/3825
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
105 words
A heat sensitive transfer medium which comprises a transfer sheet having a transfer layer consisting essentially of a leuco-dye color former and a receiving sheet having a receiving layer consisting essentially of a developer for said leuco-dye and a binder, wherein said transfer layer further contains 0.01 to 1 part by weight of polyester resin which has a melting point of 50° to 130° C. and a repetition unit represented by the formula: ##STR3## together with 0.01 to 1 part by weight of a porous filler which has an oil absorption of 50 ml or more/100 g, respectively, per part by weight of said leuco-dye.
Claim 2
Dependent Claim
105 words
A heat sensitive transfer medium which comprises a transfer sheet having a transfer layer consisting essentially of a leuco-dye color former and a receiving sheet having a receiving layer consisting essentially of a developer for said leuco-dye and a binder, wherein said transfer layer further contains 0.01 to 1 part by weight of polyester resin which has a melting point of 50° to 130° C. and a repetition unit represented by the formula: ##STR3## together with 0.01 to 1 part by weight of a porous filler which has an oil absorption of 50 ml or more/100 g, respectively, per part by weight of said leuco-dye.
Claim 3
Dependent Claim
37 words
A transfer medium according to claim 1 wherein said porous filler is an inorganic or organic fine powder selected from the group consisting of silica, aluminum silicate, alumina, aluminum hydroxide, magnesium hydroxide, urea-formaldehyde resin and styrene resin.
Claim 4
Dependent Claim
28 words
A transfer medium according to claim 1 wherein the amount of leuco-dye used is in the range of 0.3 to 30 g per square meter of the substrate.
Claim 5
Dependent Claim
32 words
A transfer medium according to claim 1 wherein the amount of binder contained in the receiving layer is about 0.1 to 1.0 part by weight per part by weight of the developer.
Claim 6
Dependent Claim
28 words
A transfer medium according to claim 1 wherein the developer is selected from the group consisting of an organic acid or its salt or ester and zinc chloride.
Claim 7
Dependent Claim
19 words
A transfer medium according to claim 5 wherein the melting point of the developer is 200° C. or less.
Claim 8
Dependent Claim
18 words
A transfer medium according to claim 1 wherein said porous filler is further contained in the receiving layer.
Claim 9
Dependent Claim
25 words
A transfer medium according to claim 1 wherein said transfer layer further contains a heat-fusible material having a melting point of 200° C. or less.
Claim 10
Dependent Claim
25 words
A transfer medium according to claim 1 wherein the receiving layer further contains a heat-fusible material having a melting point of 200° C. or less.
Claim 11
Dependent Claim
14 words
A transfer medium according to claim 1 wherein the developer is a phenolic substance.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |