US4968657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal transfer printing
Assignee: Imperial Chemical Industries Ltd
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Filing: 1989-04-24
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Granted: 1990-11-06
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Expires: 2009-04-24
Abstract
Abstract A thermal transfer printing sheet, suitable for use in a thermal transfer printing process, comprising a substrate having a coating comprising a dye of the formula: ##STR1## wherein X represents nitro or --COOR 1 in which R 1 is an optionally substituted hydrocarbyl radical; Y represents an optionally substituted C 1-10 -alkyl or alkoxy radical; Z represents an alkyl radical, and R represents an alkyl radical which may be interrupted by one or two --O-- or --COO-- links.
Inventors
- 👤 Peter Gregory
- 👤 Roy Bradbury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:01
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/385; B41M5/388; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
83 words
A thermal transfer printing sheet comprising a substrate having a coating comprising a binder, and a dye of the formula: ##STR3## wherein X represents nitro or --COOR 1 in which R 1 is an optionally substituted hydrocarbyl radical; Y represents an optionally substituted C 1-10 -alkyl or C 1-10 -alkoxy radical; Z represents an alkyl radical, and R represents a C 1 , C 2 , or C 3 -alkyl radical which may be interrupted by one or two --O-- or --COO-- links.
Claim 2
Dependent Claim
83 words
A thermal transfer printing sheet comprising a substrate having a coating comprising a binder, and a dye of the formula: ##STR3## wherein X represents nitro or --COOR 1 in which R 1 is an optionally substituted hydrocarbyl radical; Y represents an optionally substituted C 1-10 -alkyl or C 1-10 -alkoxy radical; Z represents an alkyl radical, and R represents a C 1 , C 2 , or C 3 -alkyl radical which may be interrupted by one or two --O-- or --COO-- links.
Claim 3
Dependent Claim
24 words
A thermal transfer printing sheet according to claim 1, wherein, in the dye, Y is a C 1-6 -alkyl or C 1-6 -alkoxy radical.
Claim 4
Dependent Claim
21 words
A thermal transfer printing sheet according to claim 1, wherein, in the dye, Z is an unbranched C 1-4 -alkyl radical.
Claim 5
Dependent Claim
13 words
A thermal transfer printing sheet according to claim 3 wherein Z is methyl.
Claim 6
Dependent Claim
17 words
A thermal transfer printing sheet according to claim 1, wherein R is n-C 3 H 7 .
Claim 7
Dependent Claim
55 words
A thermal transfer printing process which comprises contacting a transfer sheet according to claim 1, with a receiver sheet, so that the dye is in contact with the receiver sheet and selectively heating areas of the transfer sheet whereby dye in the heated areas of the transfer sheet is selectively transferred to the receiver sheet.
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) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |