US3751286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermographic transfer sheet and process of copying therewith
Assignee: Columbia Ribbon and Carbon Manufacturing Co Inc
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Filing: 1971-07-12
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Granted: 1973-08-07
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Expires: 1991-07-12
Abstract
Abstract Thermographic transfer sheet and method for making and using same. Transfer sheet comprises a plastic film foundation carrying a thin, non-transferable imaging layer comprising a crystalline, vaporizable aromatic acid, a film-forming binder material and an inert solid particulate filler material. The filler material impedes crystal growth and disrupts the continuity of the layer whereby the aromatic acid vapors are liberated under the effect of heating.
Inventors
- 👤 D Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:42
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/382; B41M5/38235; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S430/00; Y10S430/145; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
13 words
Transfer sheet according to claim 1 in which the film foundation comprises polystyrene.
Claim 2
Dependent Claim
14 words
Transfer sheet according to claim 1 in which the aromatic acid comprises salicylic acid.
Claim 3
Dependent Claim
12 words
Transfer sheet according to claim 1 in which the filler comprises silica.
Claim 4
Dependent Claim
45 words
Transfer sheet according to claim 1 in association with a reactive receptor sheet comprising a plastic film foundation having thereon a coating comprising a substantially colorless chemical compound which is reactive with the vapors of said aromatic acid to form an intensely colored reaction product.
Claim 5
Dependent Claim
198 words
Reflex thermographic process for producing a copy of an imaged original sheet comprising superposing a transfer sheet, a copy sheet and an imaged original sheet and applying infrared radiation through said transfer and copy sheets to said original images to cause imagewise heating of said transfer sheet and imagewise transfer of imaging material to said copy sheet to form a copy of said original sheet, characterized in that said transfer sheet comprises a thin plastic film foundation having thereon a thin heat-non-transferable layer comprising 1 part by weight of a heat-vaporizable crystalline aromatic acid imaging material having a vaporization temperature between about 190* F and 225* F, from 0.05 to 0.5 part by weight of a finely divided, powdery, inert filler having an average particle size less than about 1 micron which inhibits the crystal growth of said aromatic acid and froM 1 to 5 parts by weight of a synthetic thermoplastic film-forming binder material which is soluble in a volatile solvent capable of dissolving said acid but incapable of dissolving said plastic film foundation, said layer transferring vapors of said aromatic acid imaging material to said copy sheet to form a copy of said imaged original sheet.
Claim 6
Dependent Claim
42 words
Process according to claim 6 in which said copy sheet comprises a plastic film foundation having thereon a coating comprising a substantially colorless chemical compound which is reactive with the vapors of said aromatic acid to form an intensely colored reaction product.
Claim 7
Dependent Claim
13 words
Process according to claim 6 in which the aromatic acid comprises salicylic acid.
Claim 8
Dependent Claim
12 words
Process according to claim 6 in which the inert filler comprises silica.
Claim 9
Dependent Claim
24 words
Process according to claim 7 in which said copy sheet is releasably attached along one edge to said transfer sheet to comprise a unit.
References Cited (Backward Citations)
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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) | 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 |