Patent US3762926A successfully refreshed from Google Patents.
US3762926A
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Gelatino silver halide emulsion containing a trimesic aldehyde hardening agent
Assignee: Agfa Gevaert AG
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Filing: 1971-01-05
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Granted: 1973-10-02
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Expires: 1991-01-05
Abstract
Abstract Trimesic aldehydes, which are substituted in the 2-,4- and 6position with chlorine, hydroxy or methoxy, as well as hexamethyl acetals and bisulfite addition products of such aldehydes are useful for hardening gelatin layers especially photographic gelatin layers. The hardening effect is developed by rendering alkaline the gelatin that contains any of these aldehydes.
Inventors
- 👤 W Himmelmann
- 👤 E Roos
- 👤 J Sobel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/30; G03C1/301; C; C07; C07C; C07C45/00; C07C45/27; C07C45/42; C07C45/43; C07C45/51; C07C45/511; C07C45/515; C07C45/61; C07C45/67; C07C45/673; C07C45/68; C07C45/70; C07C45/71; C07C47/00; C07C47/52; C07C47/55; C07C47/56; C07C47/565; C07C47/575
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
27 words
A photographic material as claimed in claim 1, wherein the gelatin containing the trimesic aldehyde is included in a layer other than the gelatino-silver halide emulsion layer.
Claim 2
Dependent Claim
117 words
In a process for providing gelatin in a photographic material by casting a gelatino-silver halide emulsion on a support, or by casting a gelatin layer on a support with a light sensitive element comprised of gelatino-silver halide emulsion and drying the cast materials on the support, the improvement which consists of incorporating in gelatin for casting on the support a hardening amount of a trimesic aldehyde which is substituted with chlorine, hydroxy, or methoxy in the 2-, 4- and 6-positions, or the hexamethyl acetal or bisulfite addition product of such aldehyde, and subsequent to the casting and drying, treating gelatin containing the trimesic aldehyde on the supported casting in an alkaline solution to increase the pH thereof.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |