Patent US2659674A successfully refreshed from Google Patents.
US2659674A
Expired / Lapsed
US
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Method of toning photographs and composition therefor
Assignee: Individual
•
Filing: 1948-04-05
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Granted: 1953-11-17
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Expires: 1968-04-05
Abstract
No abstract record available.
Inventors
- 👤 Hyndman Olan Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:33
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/40; G03C5/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A METHOD OF PRODUCING A MULTIPLE COLORED PHOTOGRAPHIC IMAGE FROM AN INITIAL SILVER PHOTOGRAPHIC IMAGE WHICH INCLUDES REACTING SAID INITIAL IMAGE IN A SINGLE IMMERSION WITH A SOLUTION CONSISTING SOLELY OF CHROMIC ACID AND SODIUM THIOSULPHATE IN AN AMOUNT WITH THE RATIO OF CHROMIC ACID TO SODIUM THIOSULPHATE IN THE SOLUTION BEING ADJUSTED SO THAT THE SOLUTION WILL CONVERT CERTAIN PORTIONS OF THE IMAGE TO SILVER CHROMATE AND WILL REPLACE CERTAIN OTHER PORTIONS OF SAID IMAGE WITH CHROMIUM, THE PARTICULAR AFFECT ON EACH PORTION BEING IN ACCORDANCE WITH THE DENSITY OF THE SILVER DEPOSIT IN THE VARIOUS PORTIONS OF THE IMAGE.
Claim 2
Independent Claim
101 words
A METHOD OF PRODUCING A MULTIPLE COLORED PHOTOGRAPHIC IMAGE FROM AN INITIAL SILVER PHOTOGRAPHIC IMAGE WHICH INCLUDES REACTING SAID INITIAL IMAGE IN A SINGLE IMMERSION WITH A SOLUTION CONSISTING SOLELY OF CHROMIC ACID AND SODIUM THIOSULPHATE IN AN AMOUNT WITH THE RATIO OF CHROMIC ACID TO SODIUM THIOSULPHATE IN THE SOLUTION BEING ADJUSTED SO THAT THE SOLUTION WILL CONVERT CERTAIN PORTIONS OF THE IMAGE TO SILVER CHROMATE AND WILL REPLACE CERTAIN OTHER PORTIONS OF SAID IMAGE WITH CHROMIUM, THE PARTICULAR AFFECT ON EACH PORTION BEING IN ACCORDANCE WITH THE DENSITY OF THE SILVER DEPOSIT IN THE VARIOUS PORTIONS OF THE IMAGE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |