US3034891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Procedure for the production of yellow dye images by color development
Assignee: GAF Chemicals Corp
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Filing: 1958-07-31
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Granted: 1962-05-15
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Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Burgardt Lothar
- 👤 Pelz Willibald
- 👤 Wahl Ottmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:05
CPC Classifications
C; C07; C07C; C07C255/00; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/44; C07D231/46; C07D231/48; C07D235/00; C07D235/02; C07D235/04; C07D235/18; G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3028; G03C5/3035; G03C7/00; G03C7/30; G03C7/32; G03C7/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
THE METHOD OF PRODUCING YELLOW DYESTUFF IMAGES IN A SILVER HALIDE EMULSION LAYER WHICH COMPRISES EXPOSING THE LAYER AND DEVELOPING IT WITH A 4-AMINO-5-PYRAZOLONE DEVELOPING AGENT IN THE PRESENCE OF A DYE COUPLER HAVING A CYANOACETAMIDO GROUP AND SELECTED FROM THE CLASS CONSISTING OF THOSE CHARACTERIZED BY THE FOLLOWING FORMULAE:
Claim 2
Independent Claim
50 words
THE METHOD OF PRODUCING YELLOW DYESTUFF IMAGES IN A SILVER HALIDE EMULSION LAYER WHICH COMPRISES EXPOSING THE LAYER AND DEVELOPING IT WITH A 4-AMINO-5-PYRAZOLONE DEVELOPING AGENT IN THE PRESENCE OF A DYE COUPLER HAVING A CYANOACETAMIDO GROUP AND SELECTED FROM THE CLASS CONSISTING OF THOSE CHARACTERIZED BY THE FOLLOWING FORMULAE:
References Cited (Backward Citations)
US2182815A
Cited
FR1124976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |