US3660102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsions sensitized with methine dyes containing a thiosulfatoalkyl group
Assignee: Agfa Gevaert AG
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Filing: 1970-04-01
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Granted: 1972-05-02
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Expires: 1990-04-01
Abstract
Abstract Light-sensitive photographic silver halide emulsions can be spectrally sensitized by new monomethine or polymethine dyes which are hydrophilized by at least one thiosulfatoalkyl group of the formula -(CH2)n-S-SO3H with n 1 to 6. These new dyes are prepared by reacting suitable heterocyclic bases with an excess of Alpha , omega -dihalogenalkanes to form the 1:1 addition products from which are formed the heterocyclic omega -thiosulfatoalkyl quaternary salts the latter being a suitable intermediate product for condensation reactions to form the new dyes according to known methods.
Inventors
- 👤 Oskar Riester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:16
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; C09B23/105; C09B23/02; C09B23/04; C09B23/06; C09B23/08; C09B23/083; C09B23/107
Claims Analysis
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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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |