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Patent US3751318A successfully refreshed from Google Patents.
US3751318A
Expired / Lapsed
US
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Thermographic transfer process
Assignee: Columbia Ribbon and Carbon Manufacturing Co Inc
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Filing: 1971-01-25
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Granted: 1973-08-07
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Expires: 1991-01-25
Abstract
Abstract Thermographic transfer duplication process employing novel thermographic transfer sheets having a heat-transferable layer comprising discrete particles which are capable of softening and adhering to a copy sheet at thermographic temperatures.
Inventors
- 👤 D Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:20
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/392; B41M5/395; Y; Y10; Y10S; Y10S428/00; Y10S428/914; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24893
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
40 words
Process according to claim 1 in which the particles of the imaging layer comprise a major amount by weight of wax and a minor amount by weight of a film-forming binder material having a higher melting point than the wax.
Claim 2
Dependent Claim
19 words
Process according to claim 1 in which the particles of the imaging layer comprise a low molecular weight polyethylene.
Claim 3
Dependent Claim
20 words
Process according to claim 1 in which the particles are oleophilic and the copy sheet is a planographic printing plate.
Claim 4
Dependent Claim
19 words
Process according to claim 1 in which the imaging layer contains a minor amount by weight of coloring matter.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |