US2500140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sensitive photographic materials
Assignee: Eastman Kodak Co
•
Filing: 1947-03-06
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Granted: 1950-03-07
•
Expires: 1967-03-06
Abstract
No abstract record available.
Inventors
- 👤 Eric F Teal
- 👤 Edward P Davey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48515
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE METHOD OF MAKING A DIRECT POSITIVE DEVELOPING OUT SILVER SALT EMULSION WHICH COMPRISES FORMING THE SENSITIVE SILVER SALT IN THE PRESENCE OF AN AMOUNT OF A REDUCING AGENT OF THE CLASS CONSISTING OF ABOUT 3.1 GRAMS OF AN ARSENITE, ABOUT 0.008 GRAM OF A STANNITE, FROM 0.8 TO 2.36 GRAMS OF A PHOSPHITE, ABOUT 1.6 GRAMS OF AN ANTIMONITE AND ABOUT 0.016 GRAM OF A HYPOSULPHITE, EACH PER 100 GRAMS OF SILVER IN THE EMULSION.
Claim 2
Independent Claim
76 words
THE METHOD OF MAKING A DIRECT POSITIVE DEVELOPING OUT SILVER SALT EMULSION WHICH COMPRISES FORMING THE SENSITIVE SILVER SALT IN THE PRESENCE OF AN AMOUNT OF A REDUCING AGENT OF THE CLASS CONSISTING OF ABOUT 3.1 GRAMS OF AN ARSENITE, ABOUT 0.008 GRAM OF A STANNITE, FROM 0.8 TO 2.36 GRAMS OF A PHOSPHITE, ABOUT 1.6 GRAMS OF AN ANTIMONITE AND ABOUT 0.016 GRAM OF A HYPOSULPHITE, EACH PER 100 GRAMS OF SILVER IN THE EMULSION.
References Cited (Backward Citations)
GB462730A
Cited
US2005837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |