US3847612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive heat-developable sheet material
Assignee: 3M Co
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Filing: 1973-02-02
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Granted: 1974-11-12
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Expires: 1993-02-02
Abstract
Abstract Dust formation is avoided and dense black images are obtained during heat development of exposed dry silver sheet materials by employing a synergistic combination of individually ineffective toner materials.
Inventors
- 👤 J Winslow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498; G03C1/49836; G03C1/49845
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
A PHOTOSENSITIVE HEAT-DEVELOPABLE SHEET MATERIAL HAVING AN IMAGE-FORMING STRATUM COMPRISING (1) PHOTO-SENSITIVE SILVER HALIDE CATALYST-FORMING MEANS AND (2) HEAT-SENSITIVE REACTING IMAGE-FORMING MEANS INCLUDING AN ORGANIC SILVER SALT OXIDIZING AGENT AND A HINDERED PHENOLIC REDUCING AGENT FOR SILVER ION, THE OXIDATION-REDUCTION REACTION OF WHICH TO PRODUCE A VISIBLE CHANGE IS ACCELERATED BY SAID CATALYST, AND (3) AS IMAGE INTENSIFIER MATERIAL, A MIXTURE OF (A) ONE OR MORE OF THE COMPOUNDS PHTHALIC ACID, MAPHTHALENE -2,3-DICARBOXYLIC ACID, OR PHTHALAMIC ACIE, AND (B) AN IMIDAZOLE.
Claim 2
Dependent Claim
81 words
A PHOTOSENSITIVE HEAT-DEVELOPABLE SHEET MATERIAL HAVING AN IMAGE-FORMING STRATUM COMPRISING (1) PHOTO-SENSITIVE SILVER HALIDE CATALYST-FORMING MEANS AND (2) HEAT-SENSITIVE REACTING IMAGE-FORMING MEANS INCLUDING AN ORGANIC SILVER SALT OXIDIZING AGENT AND A HINDERED PHENOLIC REDUCING AGENT FOR SILVER ION, THE OXIDATION-REDUCTION REACTION OF WHICH TO PRODUCE A VISIBLE CHANGE IS ACCELERATED BY SAID CATALYST, AND (3) AS IMAGE INTENSIFIER MATERIAL, A MIXTURE OF (A) ONE OR MORE OF THE COMPOUNDS PHTHALIC ACID, MAPHTHALENE -2,3-DICARBOXYLIC ACID, OR PHTHALAMIC ACIE, AND (B) AN IMIDAZOLE.
Claim 3
Dependent Claim
13 words
Sheet material of claim 1 wherein said hindered phenolic reducing agent is 2,6-methylene-bis(2-hydroxy-3-tertiary-butyl-5-methylphenyl)-4-methylphenol.
Claim 4
Dependent Claim
32 words
Sheet material of claim 1 wherein said intensifier material is constituted of 0.04 to 0.8 mole of said acid and 0.02 to 1.4 moles of said imidazole per mole of total silver.
Claim 5
Dependent Claim
16 words
Sheet material of claim 3 wherein said image intensifier material consists of phthalic acid and imidazole.
Claim 6
Dependent Claim
16 words
Sheet material of claim 3 wherein said image intensifier material consists of phthalic acid and benzimidazole.
Claim 7
Dependent Claim
41 words
Sheet material of claim 1 wherein said hindered phenolic reducing agent is 2,6-methylene-bis(2-hydroxy-3-tertiarybutyl-5-methylphenyl)-4-methylphenol and said image intensifier material consists of 0.15 to 0.5 mole of phthalic acid and 0.04 to 0.7 mole of imidazole or benzimidazole per mole of total silver.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |