Patent US3141773A successfully refreshed from Google Patents.
US3141773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and photographic material for the production of photographic records and copies which are corrected for tone value
Assignee: Agfa Gevaert NV
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Filing: 1958-02-05
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Granted: 1964-07-21
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Expires: 1978-02-05
Abstract
No abstract record available.
Inventors
- 👤 Hellmig Ehrhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:39
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
A PHOTOGRAPHIC MATERIAL COMPRISING, IN COMBINATION, A SUPPORT, A CONTINUOUS-TONE SILVER HALIDE PHOTOGRAPHIC EMULSION, AND A SECOND LESS SENSITIVE SILVER HALIDE PHOTOGRAPHIC EMULSION OF GREATER GAMMA VALUE DEPOSITED THEREON, BOTH OF SAID EMULSIONS BEING SENSITIVE TO SUBSTANTIALLY THE SAME SPECTRAL REGION BUT DIFFERING IN SPEED WITHIN SAID SPECTRAL REGION, THE SECOND EMULSION HAVING A SPEED OF ABOUT .1-.01 OF THE SPEED OF SAID CONTINUOUS-TONE EMULSION, THE MAXIMUM AND MINIMUM RATION OF AVERAGE SPEEDS OF THE TWO EMULSIONS, WHEN AVERAGED OVER EACH PARTIAL ZONE OF THE SPECTRUM EXTENDING OVER ONE-THIRD OF SAID SPECTRAL REGION, DIFFEREING BY A FACTOR OF 1.5-25.
Claim 2
Dependent Claim
99 words
A PHOTOGRAPHIC MATERIAL COMPRISING, IN COMBINATION, A SUPPORT, A CONTINUOUS-TONE SILVER HALIDE PHOTOGRAPHIC EMULSION, AND A SECOND LESS SENSITIVE SILVER HALIDE PHOTOGRAPHIC EMULSION OF GREATER GAMMA VALUE DEPOSITED THEREON, BOTH OF SAID EMULSIONS BEING SENSITIVE TO SUBSTANTIALLY THE SAME SPECTRAL REGION BUT DIFFERING IN SPEED WITHIN SAID SPECTRAL REGION, THE SECOND EMULSION HAVING A SPEED OF ABOUT .1-.01 OF THE SPEED OF SAID CONTINUOUS-TONE EMULSION, THE MAXIMUM AND MINIMUM RATION OF AVERAGE SPEEDS OF THE TWO EMULSIONS, WHEN AVERAGED OVER EACH PARTIAL ZONE OF THE SPECTRUM EXTENDING OVER ONE-THIRD OF SAID SPECTRAL REGION, DIFFEREING BY A FACTOR OF 1.5-25.
References Cited (Backward Citations)
US1303635A
Cited
US1804727A
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US2202026A
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US2239698A
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US2449966A
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GB732691A
Cited
US3050391A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-21 | 1968-01-20 | 1968-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-21 | 1972-01-20 | 1972-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-21 | 1976-01-20 | 1976-07-21 | $7700.00 | Window Closed / Lapsed |