US3752670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film element and method for obtaining photographic records of water-submerged objects
Assignee: Eastman Kodak Co
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Filing: 1971-12-29
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Granted: 1973-08-14
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Expires: 1991-12-29
Abstract
Abstract A COLOR PHOTOGRAPHIC ELEMENT COMPRISING A BLUESENSITIZED SILVER HALIDE EMULSION LAYER HAVING A MAXIMUM LIGHT ABSORPTION WITHIN ABOUT 480=500 NM. AND HAVING SUBSTANTIALLY NO ABSORPTION ABOVE ABOUT 510 NM., CONTAINING A BENZO- OR NAPHTHO-THIA, OXA- OR SELENACARBOCYANINE SALT AS A BLUE SPECTRAL SENSITIZER DYE, AN INNER GREENSENSITIZED EMULSION LAYER RESPONSIVE TO LIGHT WITHIN ABOUT 525-590 NM. AND AN INTERMEDIATE FILTER LAYER THAT FILTERS LIGHT IN THE RANGE OF ABOUT 400-520 NM.; AND ALSO A METHOD FOR IMPROVING PHOTOGRAPHIC RECORDAL OF OBJECTS SUBMERGED IN WATER BY USING SUCH PHOTOGRAPHIC ELEMENTS.
Inventors
- 👤 D Needler
- 👤 J Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:14
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/392; G03C7/39208; G03C7/39292; C; C09; C09B; C09B23/00; C09B23/02; C09B23/04; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/16; G03C7/3041; G03C2200/00; G03C2200/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |