US2701766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developers for and method of producing phenazonium dyestuff images with p-dialkylaminoaniline developing agents
Assignee: GAF Chemicals Corp
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Filing: 1952-06-14
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Granted: 1955-02-08
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Expires: 1972-06-14
Abstract
No abstract record available.
Inventors
- 👤 Lee C Hensley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:01
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3244
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
THE METHOD OF PRODUCING MAGENTA PHENAZONIUM DYESTUFF IMAGE IN A GELATINO SILVER HALIDE EMULSION LAYER WHICH COMPRISES EXPOSING THE LAYER AND DEVELOPING IT WITH AN N,N-DIALKYL-PHENYLENEDIAMINE DEVELOPING AGENT CONTAINING ONLY THE TWO AMINO GROUPS IN THE PRESENCE OF A PHENAZONIUM DYE COUPLER COMPOUND SELECTED FROM THE LASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
Claim 2
Independent Claim
55 words
THE METHOD OF PRODUCING MAGENTA PHENAZONIUM DYESTUFF IMAGE IN A GELATINO SILVER HALIDE EMULSION LAYER WHICH COMPRISES EXPOSING THE LAYER AND DEVELOPING IT WITH AN N,N-DIALKYL-PHENYLENEDIAMINE DEVELOPING AGENT CONTAINING ONLY THE TWO AMINO GROUPS IN THE PRESENCE OF A PHENAZONIUM DYE COUPLER COMPOUND SELECTED FROM THE LASS CONSISTING OF THOSE CORRESPONDING TO THE FOLLOWING FORMULAE:
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) | 1958-02-07 | 1958-08-09 | 1959-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-07 | 1962-08-09 | 1963-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-07 | 1966-08-09 | 1967-02-08 | $7700.00 | Window Closed / Lapsed |