Patent US3877944A successfully refreshed from Google Patents.
US3877944A
Expired / Lapsed
US
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Photographic silver salt emulsions comprising polymers with disulfonimide groups
Assignee: Agfa Gevaert AG
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Filing: 1974-03-15
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Granted: 1975-04-15
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Expires: 1994-03-15
Abstract
Abstract Photographic silver salt gelatin emulsions are made by precipitating the silver salt in the presence of gelatin, flocculation and washing the flocculate, with an aqueous solution of a polymer containing disulfonimide groups.
Inventors
- 👤 Wilhelm Saleck
- 👤 Gerhard Balle
- 👤 Wolfgang Himmelmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:03
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; C; C08; C08F; C08F28/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
A PHOTOGRAPHIC MATERIAL CONTAINING AT LEAST ONE SUPPORTED SILVER SALT GELATIN EMULSION LAYER, WHICH CONTAINS A POLYMERIC DISULFONIMIDE, THE DISULFONIMIDE GROUPS BEING ATTACHED TO THE POLYMER CHAIN EITHER DIRECTLY OR VIA BRIDGE MEMBERS.
Claim 2
Dependent Claim
33 words
A PHOTOGRAPHIC MATERIAL CONTAINING AT LEAST ONE SUPPORTED SILVER SALT GELATIN EMULSION LAYER, WHICH CONTAINS A POLYMERIC DISULFONIMIDE, THE DISULFONIMIDE GROUPS BEING ATTACHED TO THE POLYMER CHAIN EITHER DIRECTLY OR VIA BRIDGE MEMBERS.
Claim 3
Dependent Claim
17 words
The photographic material of claim 1, containing water-soluble polymers of olefinically unsaturated disulfonimides of the following formula
Claim 4
Dependent Claim
40 words
The photographic material of claim 1, wherein the polymeric disulfonimide is a polymer of acrylic acid or methacrylic acid, the disulfonimide group being attached to the carboxyl group of acrylic acid or methacrylic acid via an amide or ester bond.
Claim 5
Dependent Claim
18 words
The material of claim 2, wherein the polymeric disulfonimide is a homopolymer or copolymer of the following monomer:
Claim 6
Dependent Claim
24 words
The material of claim 2, wherein the polymeric disulfonimide is a copolymer of acrylic acid, acrylic acid esters, acrylic acid amide or methacrylic acid.
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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |