Patent DE692953C successfully refreshed from Google Patents.
US3425834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mordants for bleachable filter layers
Assignee: Eastman Kodak Co
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Filing: 1965-08-16
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Granted: 1969-02-04
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Expires: 1985-08-16
Abstract
No abstract record available.
Inventors
- 👤 Dugald A Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:56
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/52; G03C8/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT MATERIAL HAVING THEREON A HYDROPHILIC COLLOID LAYER CONTAINING AT LEAST ONE MORDANT REPRESENTED BY THE FORMULA:
Claim 2
Dependent Claim
22 words
A PHOTOGRAPHIC ELEMENT COMPRISING A SUPPORT MATERIAL HAVING THEREON A HYDROPHILIC COLLOID LAYER CONTAINING AT LEAST ONE MORDANT REPRESENTED BY THE FORMULA:
References Cited (Backward Citations)
US3016306A
Cited
US3271148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |