US2697040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic composition containing antiplumming and antibronzing agents
Assignee: EIDP Inc
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Filing: 1952-01-11
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Granted: 1954-12-14
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Expires: 1972-01-11
Abstract
No abstract record available.
Inventors
- 👤 Norman E Parnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; Y; Y10; Y10S; Y10S430/00; Y10S430/13
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PHOTOGRAPHIC COLLOID-SILVER HALIDE EMULSION HAVING DISPERSED THERETHROUGH PARTICLES OF A POLYMERIC AMINO-NITROGEN CONTAINING ORGANIC MATERIAL WHICH IS INSOLUBLE IN WATER AND 5% AQUEOUS AMMONIA BUT SOLUBLE IN 1% AQUEOUS ACETIC ACID AND FORMS HARD, RESIN-LIKE FILMS, SAID PARTICLES CONTAINING A SULFUR-CONTAINING ORGANIC COMPOUND WHICH HAS THE PROPERTY OF PREVENTING BRONZE- TO PLUM-COLORED SILVER IMAGES UPON THE HOT-DRYING OF DEVELOPED PHOTOGRAPHIC SILVER IMAGES.
Claim 2
Dependent Claim
63 words
A PHOTOGRAPHIC COLLOID-SILVER HALIDE EMULSION HAVING DISPERSED THERETHROUGH PARTICLES OF A POLYMERIC AMINO-NITROGEN CONTAINING ORGANIC MATERIAL WHICH IS INSOLUBLE IN WATER AND 5% AQUEOUS AMMONIA BUT SOLUBLE IN 1% AQUEOUS ACETIC ACID AND FORMS HARD, RESIN-LIKE FILMS, SAID PARTICLES CONTAINING A SULFUR-CONTAINING ORGANIC COMPOUND WHICH HAS THE PROPERTY OF PREVENTING BRONZE- TO PLUM-COLORED SILVER IMAGES UPON THE HOT-DRYING OF DEVELOPED PHOTOGRAPHIC SILVER IMAGES.
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) | 1957-12-13 | 1958-06-14 | 1958-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-13 | 1962-06-14 | 1962-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-13 | 1966-06-14 | 1966-12-14 | $7700.00 | Window Closed / Lapsed |