US3681076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide emulsions containing couplers with fluoroaliphaticsulfonyloxy groups
Assignee: 3M Co
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Filing: 1970-06-10
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Granted: 1972-08-01
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Expires: 1990-06-10
Abstract
Abstract A COUPLER OF THE FORMULA R-X WHEREIN R IS AN ORGANIC COUPLING RADICAL AND WHEREIN X IS A FLOROALIPHATICSULFONYLOXY GROUP WHICH IS BONDED TO AN AROMATIC RING OF THE R GROUP.
Inventors
- 👤 Ivan H Skoog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:00
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3212
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |