US2991177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of incorporating coupler with dimethyl formamide in hydrophilic colloids
Assignee: GAF Chemicals Corp
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Filing: 1957-12-23
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Granted: 1961-07-04
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Expires: 1977-12-23
Abstract
No abstract record available.
Inventors
- 👤 Curt B Roth
- 👤 Fritz W H Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:11
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3885; C; C07; C07D; C07D231/00; C07D231/02; C07D231/10; C07D231/14; C07D231/18; C07D231/20; C07D231/22; C07D231/26; C07D231/44; C07D231/52; C07K; C07K1/00; C07K1/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE METHOD OF INCORPORATING IN A WATER SOLUBLE HYDROPHILIC PHOTOGRAPHIC COLLOIDE, A HYDROPHOBIC COLORFORMING COMPOUND CAPABLE OF REACTING WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO DEVELOPING AGENT TO FORM A DYE WHICH COMPRISES FORMING A SOLUTION CONSISTING OF SAID COLOR-FORMING COMPOUND AND DIMETHYLFORMAMIDE, INTIMATELY BLENDING SAID SOLUTION WITH THE PHOTOGRAPHIC COLLOID, REMOVING SUBSTANTIALLY ALL OF THE DIMETHYLFORMAMIDE THEREBY LEAVING UNIFORMLY DISTRIBUTED IN THE PHOTOGRAPHIC COLLOID THE COLOR-FORMING COMPOUND.
Claim 2
Independent Claim
70 words
THE METHOD OF INCORPORATING IN A WATER SOLUBLE HYDROPHILIC PHOTOGRAPHIC COLLOIDE, A HYDROPHOBIC COLORFORMING COMPOUND CAPABLE OF REACTING WITH THE OXIDATION PRODUCT OF A PRIMARY AROMATIC AMINO DEVELOPING AGENT TO FORM A DYE WHICH COMPRISES FORMING A SOLUTION CONSISTING OF SAID COLOR-FORMING COMPOUND AND DIMETHYLFORMAMIDE, INTIMATELY BLENDING SAID SOLUTION WITH THE PHOTOGRAPHIC COLLOID, REMOVING SUBSTANTIALLY ALL OF THE DIMETHYLFORMAMIDE THEREBY LEAVING UNIFORMLY DISTRIBUTED IN THE PHOTOGRAPHIC COLLOID THE COLOR-FORMING COMPOUND.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |