US3785824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic aqueous dispersion concentrates
Assignee: 3M Co
•
Filing: 1971-09-24
•
Granted: 1974-01-15
•
Expires: 1991-09-24
Abstract
Abstract A synthetic, water-soluble polymer having a hydrocarbon backbone is employed as a dispersing agent in dispersions in water of a solvent for high-boiling, water-immiscible vehicles useful in the photographic solvent-dispersion technique for the formation of coupler-containing photographic silver halide elements.
Inventors
- 👤 R Fisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:49
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/305; G03C5/264; G03C5/266
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
12 words
The dispersion of claim 1 wherein said polymeric dispersing agent is anionic.
Claim 2
Dependent Claim
21 words
The dispersion of claim 1 wherein said dispersing agent is a water-soluble addition polymer hydrolyzate having recurring units of the formula
Claim 3
Dependent Claim
17 words
The dispersion of claim 3 wherein said dispersing agent is the copolymer of maleic anhydride and styrene.
Claim 4
Dependent Claim
17 words
The dispersion of claim 3 wherein said dispersing agent is the copolymer of maleic anhydride and ethylene.
Claim 5
Dependent Claim
19 words
The dispersion of claim 3 wherein said dispersing agent is the copolymer of maleic anhydride and methyl vinyl ether.
Claim 6
Dependent Claim
52 words
The concentrated dispersion of claim 1 in which the solvent is present in the dispersion in a ratio to water of from about 12 g/100 ml to about 50 g/100 ml, and the dispersing agent is present in a ratio to water of from about 0.45 g/100 ml. to 1.0 g/100 ml.
Claim 7
Dependent Claim
72 words
A concentrated dispersion in water capable of use in photographic developer kits, said dispersion comprising a solvent selected from the group consisting of aromatic alcohols, alkyl glycol etherS, aryl glycol ethers alkyl polyglycol ethers and aryl polyglycol ethers, which solvent has a solubility in water of from about 10 g/l to about 100 g/l, said dispersion including, as a dispersing agent, a water-soluble addition polymer hydrolyzate having recurring units of the formula
Claim 8
Dependent Claim
11 words
The dispersion of claim 8 wherein said solvent is benzyl alcohol.
Claim 9
Dependent Claim
12 words
The dispersion of claim 8 wherein said solvent is ethylene glycol monophenylether.
Claim 10
Dependent Claim
52 words
The concentrated dispersion of claim 7 in which the solvent is present in the dispersion in a ratio to water of from about 12 g/100 ml to about 50 g/100 ml, and the dispersing agent is present in a ratio to water of from about 0.45 g/100 ml to 1.0 g/100 ml.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |