US2725296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-layer integral negative positive photographic material
Assignee: Eastman Kodak Co
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Filing: 1951-09-14
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Granted: 1955-11-29
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Expires: 1971-09-14
Abstract
No abstract record available.
Inventors
- 👤 William B Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
A LIGHT-SENSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING THEREON A GELATINO-SILVER HALIDE EMULSION LAYER SENSITIVE TO AT LEAST ONE REGION, BUT LESS THAN ALL REGIONS, OF THE VISIBLE SPECTRUM, AND ON SAID SILVER HALIDE EMULSION LAYER A LAYER OF POLYVINYL ALCOHOL-SILVER HALIDE EMULSION SENSITIVE TO A REGION OF THE VISIBLE SPECTRUM TO
Claim 2
Dependent Claim
52 words
A LIGHT-SENSITIVE PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT HAVING THEREON A GELATINO-SILVER HALIDE EMULSION LAYER SENSITIVE TO AT LEAST ONE REGION, BUT LESS THAN ALL REGIONS, OF THE VISIBLE SPECTRUM, AND ON SAID SILVER HALIDE EMULSION LAYER A LAYER OF POLYVINYL ALCOHOL-SILVER HALIDE EMULSION SENSITIVE TO A REGION OF THE VISIBLE SPECTRUM TO
References Cited (Backward Citations)
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US1928709A
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FR716428A
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US2061688A
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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) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |