US3664858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-sensitive copy-sheet
Assignee: 3M Co
•
Filing: 1970-02-18
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Granted: 1972-05-23
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Expires: 1990-02-18
Abstract
Abstract Heat-sensitive copy-sheet coatings comprise highly methanolsoluble amine adducts of organic acidic materials. The sheets may be clear and transparent, becoming light-diffusing on heating. In a preferred form they contain amine-reactive color progenitors and become colored on heating. The presence of a mutual solvent does not cause the color-forming reaction to take place, and the reactants may therefore be coated together in a single application.
Inventors
- 👤 William A Huffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:33
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/288; B41M5/30; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31938
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
17 words
The heat-sensitive copy-sheet of claim 1 wherein said layer is supported on a clear transparent film backing.
Claim 2
Dependent Claim
25 words
The heat-sensitive copy-sheet of claims 1 wherein said adduct is soluble in methanol to the extent of at least about 50 grams per 100 cc.
Claim 3
Dependent Claim
20 words
The copy sheet of claim 1 wherein said organic acidic cOmpound is a carboxylic, sulfonic, phenolic or fluorosulfone acidic compound.
Claim 4
Dependent Claim
14 words
The copy sheet of claim 4 wherein said organic acidic compound is bis(trifluoromethylsulfonyl) methane.
Claim 5
Dependent Claim
92 words
A heat-sensitive copy-sheet adapted for making reproductions of graphic originals by thermographic copying methods and having a visibly heat-sensitive layer comprising a highly methanol-soluble co-crystal adduct, heat-dissociable at thermographic copying temperature, of a basic organic amino compound and an organic acidic compound having pKa value not greater than about 6, dissolved in a transparent organic binder, said adduct and binder being soluble in a common solvent, said layer being supported on a heat-shrinkable clear transparent film and at least one of said compounds being a softener for said film at said temperature.
Claim 6
Dependent Claim
25 words
The heat-sensitive copy-sheet of claim 6 wherein said adduct is soluble in methanol to the extent of at least about 50 grams per 100 cc.
Claim 7
Dependent Claim
19 words
The copy-sheet of claim 6 wherein said organic acidic compound is a carboxylic, sulfonic, phenolic or fluorosulfone acidic compound.
Claim 8
Dependent Claim
13 words
The copy-sheet of claim 8 wherein said organic acidic compound is bis(trifluoromethylsulfonyl) methane.
Claim 9
Dependent Claim
87 words
A heat-sensitive copy-sheet adapted for making reproductions of graphic originals by thermographic copying methods and having a visibly heat-sensitive layer comprising a highly methanol-soluble co-crystal adduct, heat-dissociable at thermographic copying temperature, of a basic organic amino compound and an organic acidic compound having a pKa value not greater than about 6, dissolved in a transparent organic binder, said adduct and binder being soluble in a common solvent, said layer including an amine-reactive color progenitor material in potentially coreactive association with said adduct and containing no free amine.
Claim 10
Dependent Claim
17 words
The heat-sensitive copy-sheet of claim 10 wherein said layer is supported on a clear transparent film backing.
Claim 11
Dependent Claim
25 words
The heat-sensitive copy-sheet of claim 10 wherein said adduct is soluble in methanol to the extent of at least about 50 grams per 100 cc.
Claim 12
Dependent Claim
19 words
The copy-sheet of claim 10 wherein said organic acidic compound is a carboxylic, sulfonic, phenolic or fluorosulfone acidic compound.
Claim 13
Dependent Claim
13 words
The copy-sheet of claim 13 wherein said organic acidic compound is bis(trifluoromethylsulfonyl) methane.
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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |