US2785958A
Expired / Lapsed
US
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Method for quantitatively testing for thiosulfate radical
Assignee: Brown Forman Distillers Corp
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Filing: 1953-11-24
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Granted: 1957-03-19
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Expires: 1973-11-24
Abstract
No abstract record available.
Inventors
- 👤 John B Copenhefer
- 👤 Henry L Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:38
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/29; G01N21/293; Y; Y10; Y10T; Y10T436/00; Y10T436/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
62 words
THE METHOD OF TESTING FOR UNIFORMITY OF THIOSULFATE RADICAL CONCENTRATION IN A DEVELOPED PHOTOGRAPHIC SILVER EMULSION WHICH COMPRISES: APPLYING AN INDICATOR SOLUTION OF ACIDIFIED POTASSIUM FERRICYANIDE AND FERRIC AMMONIUM ACETATE TO VARIOUS AREAS OF THE EMULSION HAVING SUBSTANTIALLY EQUAL SILVER GRAIN DENSITY; WIPING OFF SUPERNATANT SOLUTION AFTER A PREDETERMINED TIME, AND COMPARING THE COLORS PRODUCED BY THE INDICATOR IN THE VARIOUS AREAS.
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) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |