US2829975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3-alpha-sulfo acylamino pyrazolone color formers in which the acyl group contains a long aliphatic chain
Assignee: GAF Chemicals Corp
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Filing: 1956-04-26
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Granted: 1958-04-08
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Expires: 1976-04-26
Abstract
No abstract record available.
Inventors
- 👤 Stanley P Popeck
- 👤 Schulze Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:56
CPC Classifications
C; C09; C09B; C09B57/00; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/44; C07D231/52; G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/36; G03C7/38; G03C7/384
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
THE PROCESS OF PRODUCING A MAGNETA DYESTUFF IMAGE IN A SILVER HALIDE EMULSION WHICH COMPRISES EXPOSING SAID EMULSION TO LIGHT AND DEVELOPING THE SAME WITH A PRIMARY AROMATIC AMINO DEVELOPER IN THE PRESENCE OF A COLOR FORMER FOR MAGNETA HAVING THE FOLLOWING STRUCTURAL FORMULA:
Claim 2
Dependent Claim
44 words
THE PROCESS OF PRODUCING A MAGNETA DYESTUFF IMAGE IN A SILVER HALIDE EMULSION WHICH COMPRISES EXPOSING SAID EMULSION TO LIGHT AND DEVELOPING THE SAME WITH A PRIMARY AROMATIC AMINO DEVELOPER IN THE PRESENCE OF A COLOR FORMER FOR MAGNETA HAVING THE FOLLOWING STRUCTURAL FORMULA:
References Cited (Backward Citations)
US2186849A
Cited
CH232384A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |