US2763550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver sound track on multilayer color films
Assignee: Eastman Kodak Co
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Filing: 1953-06-18
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Granted: 1956-09-18
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Expires: 1973-06-18
Abstract
No abstract record available.
Inventors
- 👤 Robert C Lovick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:41
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/22; G03C7/24; G03C5/00; G03C5/12; G03C5/14; Y; Y10; Y10S; Y10S430/00; Y10S430/135
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A METHOD FOR SELECTIVELY REMOVING YELLOW COLLOIDAL SILVER FROM A LIGHT FILTERING LAYER OF A PHOTOGRAPHIC ELEMENT CONTAINING A DEVELOPED SILVER IMAGE IN A SEPARATE LAYER, WHICH COMPRISES SIMULTANEOUSLY TREATING THE COLLOIDAL SILVER AND THE SILVER IMAGE WITH AN AQUEOUS SOLUTION OF A COMPOUND OF THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM THIOSULFATES UNTIL THE COLLOIDAL SILVER IS SELECTIVELY BLEACHABLE WITH FERRICYANIDE SILVER BLEACHING SOLUTION IN THE PRESENCE OF THE SILVER IMAGE, THEREAFTER, WHILE RETAINING THE THIOSULFATE IN THE ELEMENT, SIMULTANEOUSLY TREATING THE COLLODIAL SILVER AND THE SILVER IMAGE WITH THE FERRICYANIDE SILVER BLEACHING SOLUTION TO CONVERT ONLY THE COLLODIAL SILVER TO A SILVER SALT SOLUBLE IN PHOTOGRAPHIC FIXING SOLUTION, WASHING THE ELEMENT UNTIL IT IS SUBSTANTIALLY FREE OF THE BLEACHING SOLUTION, AND REMOVING SAID SILVER SALT FROM THE ELEMENT BY MEANS OF A FIXING SOLUTION, LEAVING THE SILVER IMAGE SUBSTANTIALLY UNCHANGED.
Claim 2
Independent Claim
143 words
A METHOD FOR SELECTIVELY REMOVING YELLOW COLLOIDAL SILVER FROM A LIGHT FILTERING LAYER OF A PHOTOGRAPHIC ELEMENT CONTAINING A DEVELOPED SILVER IMAGE IN A SEPARATE LAYER, WHICH COMPRISES SIMULTANEOUSLY TREATING THE COLLOIDAL SILVER AND THE SILVER IMAGE WITH AN AQUEOUS SOLUTION OF A COMPOUND OF THE GROUP CONSISTING OF ALKALI METAL AND AMMONIUM THIOSULFATES UNTIL THE COLLOIDAL SILVER IS SELECTIVELY BLEACHABLE WITH FERRICYANIDE SILVER BLEACHING SOLUTION IN THE PRESENCE OF THE SILVER IMAGE, THEREAFTER, WHILE RETAINING THE THIOSULFATE IN THE ELEMENT, SIMULTANEOUSLY TREATING THE COLLODIAL SILVER AND THE SILVER IMAGE WITH THE FERRICYANIDE SILVER BLEACHING SOLUTION TO CONVERT ONLY THE COLLODIAL SILVER TO A SILVER SALT SOLUBLE IN PHOTOGRAPHIC FIXING SOLUTION, WASHING THE ELEMENT UNTIL IT IS SUBSTANTIALLY FREE OF THE BLEACHING SOLUTION, AND REMOVING SAID SILVER SALT FROM THE ELEMENT BY MEANS OF A FIXING SOLUTION, LEAVING THE SILVER IMAGE SUBSTANTIALLY UNCHANGED.
References Cited (Backward Citations)
US2341508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |