Patent US3852091A successfully refreshed from Google Patents.
US3852091A
Expired / Lapsed
US
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Thermographic transfer sheets
Assignee: Columbia Ribbon and Carbon Manufacturing Co Inc
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Filing: 1972-09-11
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Granted: 1974-12-03
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Expires: 1992-09-11
Abstract
Abstract 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, said particles being separated by an interface and air voids which provide a thermal insulation and weakened severing points between heated and unheated particles.
Inventors
- 👤 D Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:07
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/392; B41M5/395; B41C; B41C1/00; B41C1/10; B41C1/1091; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/914; Y10T; Y10T428/00; Y10T428/25
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
98 words
THE THERMOGRAPHIC TRANSFER SHEET COMPRISING A FLEXIBLE FOUNDATION CARRYING A UNIFORM THIN VOLATILE-LIQUID-APPLIED IMAGING LAYR OF DISCRETE PARTICLES WHICH SOFTEN AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 150*F TO 220*F COMPRISING A MAJOR AMOUNT BY WEIGHT OF WAX AND A MINOR AMOUNT BY WEIGHT OF RESINOUS FILM-FORMER HAVING A HIGHER MELTING POINT THAN THE WAX, THE PARTICLES BEINGSEPARATED, AT LEAST PARTIALLY, BY AN INTERFACE AND AIR AVOIDS TO FORM AREAS WHICH ARE TRANSFERABLE TO A COPY SHEET, THE SAID AIR VOIDS AND INTERFACES PROVIDING A THERMAL INSULATION AND WEAKENED SEVERING POINTS BETWEEN HEATED AND UNHEATED PARTICLES.
Claim 2
Dependent Claim
98 words
THE THERMOGRAPHIC TRANSFER SHEET COMPRISING A FLEXIBLE FOUNDATION CARRYING A UNIFORM THIN VOLATILE-LIQUID-APPLIED IMAGING LAYR OF DISCRETE PARTICLES WHICH SOFTEN AT A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 150*F TO 220*F COMPRISING A MAJOR AMOUNT BY WEIGHT OF WAX AND A MINOR AMOUNT BY WEIGHT OF RESINOUS FILM-FORMER HAVING A HIGHER MELTING POINT THAN THE WAX, THE PARTICLES BEINGSEPARATED, AT LEAST PARTIALLY, BY AN INTERFACE AND AIR AVOIDS TO FORM AREAS WHICH ARE TRANSFERABLE TO A COPY SHEET, THE SAID AIR VOIDS AND INTERFACES PROVIDING A THERMAL INSULATION AND WEAKENED SEVERING POINTS BETWEEN HEATED AND UNHEATED PARTICLES.
Claim 3
Dependent Claim
16 words
Transfer sheet according to claim 1 in which the particles comprise a low molecular weight polyethylene.
Claim 4
Dependent Claim
32 words
Transfer sheet according to claim 1 in which the imaging layer is present in a weight within the range of from about 1 to 4 pounds per 3,300 square feet of foundation.
Claim 5
Dependent Claim
20 words
Transfer sheet 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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |