US3767414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermosensitive copy sheets comprising heavy metal azolates and methods for their use
Assignee: 3M Co
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Filing: 1972-05-22
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Granted: 1973-10-23
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Expires: 1992-05-22
Abstract
Abstract Copy-sheets containing heavy metal azolates, such as silver imidazolates, are imaged by heating with a reducing agent applied in image-forming pattern. Colored images are then produced in base-sensitive copy-sheets by heating the imaged azolate sheet thereagainst.
Inventors
- 👤 W Huffman
- 👤 J Bush
- 👤 D Lowrey
- 👤 B Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/4989; G03C1/52; G03C1/72; G03C1/73; G03C5/00; G03C5/56
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
9 words
Method of claim 1 wherein said metal is silver.
Claim 2
Dependent Claim
10 words
Method of claim 1 wherein said reducing agent is photosensitive.
Claim 3
Dependent Claim
23 words
Method of claim 3 wherein said reducing agent is supplied from a second sheet held in face-tO-face contact with said first sheet material.
Claim 4
Dependent Claim
30 words
Method of claim 4 wherein said second sheet is first exposed to a light-image to an extent just sufficient to desensitize all of said reducing agent in the lighted areas.
Claim 5
Dependent Claim
23 words
Method of claim 1 including the further step of heating the imaged first sheet in face-to-face contact with a base sensitive print sheet.
Claim 6
Dependent Claim
13 words
Method of claim 6 wherein said print sheet contains an acid stabilized diazo.
Claim 7
Dependent Claim
13 words
Method of claim 6 wherein said print sheet contains a base-reactive acid-base indicator.
Claim 8
Dependent Claim
27 words
Method of claim 7 wherein said first sheet material includes at least in the image areas thereof a layer containing a said reducing agent which is photosensitive.
Claim 9
Dependent Claim
15 words
Method of claim 1 wherein said stratum contains a catalytically small proportion of silver nitrate.
Claim 10
Dependent Claim
15 words
Sheet material including a paper-thin backing carrying an image-forming stratum comprising a heavy metal azolate.
Claim 11
Dependent Claim
11 words
Sheet material of claim 11 wherein said heavy metal is silver.
Claim 12
Dependent Claim
13 words
Sheet material of claim 12 wherein said heavy metal azolate is silver imidazolate.
Claim 13
Dependent Claim
19 words
Sheet material of claim 13 wherein said stratum includes a hindered phenolic reducing agent for silver ion, and phthalazinone.
Claim 14
Dependent Claim
15 words
Sheet material of claim 12 wherein is included a catalytically small amount of silver nitrate.
Claim 15
Dependent Claim
27 words
Sheet material of claim 15 having over said stratum a coterminous vapor-transmissive polymeric barrier layer and an outer layer comprising a volatilizable reducing agent for silver ion.
Claim 16
Dependent Claim
14 words
Sheet material of claim 11 wherein said heavy metal azolate is a copper azolate.
Claim 17
Dependent Claim
38 words
A print sheet useful in a couplet with the sheet material of claim 15 in forming an image in color and comprising a base-reactive color-producing stratum and an outer stratum containing a photosensitive reducing agent for silver ion.
Claim 18
Dependent Claim
27 words
Print sheet of claim 18 wherein the color-producing Stratum comprises an acid-stabilized diazo and an azo coupler component and said reducing agent is a substituted Alpha -naphthol.
Claim 19
Dependent Claim
34 words
A couplet of the sheet material of claim 16 and in face-to-face contact therewith a print sheet having a base-reactive color-producing stratum and an outer stratum containing a photosensitive reducing agent for silver ion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |