US3869290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic silver halide elements of the Lippmann-type
Assignee: Agfa Gevaert NV
•
Filing: 1972-11-03
•
Granted: 1975-03-04
•
Expires: 1992-11-03
Abstract
Abstract WHEREIN: R is hydrogen, acyl, haloacyl or acyl carrying a quaternary ammonium group, R1 is an aliphatic, aromatic or heterocyclic group, and R2 is hydrogen, the group -S-R1 or one or more substituents selected from alkyl, aryl, halogen, hydroxyl or alkoxy. The compounds reduce distortions of image-details, enhance image-sharpness and reduce yellowing upon reversal processing. Lippmann-emulsions are described which comprise a compound of the formula:
Inventors
- 👤 Herman Adelbert Philippaerts
- 👤 Robert Joseph Pollet
- 👤 Antoon Leon Vandenberghe
- 👤 Jozef Frans Willems
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
C; C07; C07C; C07C323/00; C07D; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D277/00; C07D277/60; C07D277/62; C07D277/68; C07D277/70; C07D277/74; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/34; G03C1/346; G03C1/035; G03C2001/03511; G03C2200/00; G03C2200/34; G03C2200/38; G03C2200/45
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
48 words
PHOTOGRAPHIC SILVER HALIDE EMULSION INCLUDING A SILVER HALIDE AND HYDROPHILIC COLLOID BINDER, SAID EMULSION BEING OF THE LIPPMAN TYPE HAVING AN AVERGAGE GRAIN SIZE OF LESS THAN 100 MM AND COMPRISING FROM 20 MG TO 2 G PER MOLE OF SILVER HALIDE OF A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
48 words
PHOTOGRAPHIC SILVER HALIDE EMULSION INCLUDING A SILVER HALIDE AND HYDROPHILIC COLLOID BINDER, SAID EMULSION BEING OF THE LIPPMAN TYPE HAVING AN AVERGAGE GRAIN SIZE OF LESS THAN 100 MM AND COMPRISING FROM 20 MG TO 2 G PER MOLE OF SILVER HALIDE OF A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
25 words
Photographic emulsion according to claim 1, wherein in the formula R1 stands for 1-substituted 5-tetrazolyl or for 2-benzothiazolyl and both R nd R2 are hydrogen.
Claim 4
Dependent Claim
38 words
Photographic emulsion according to claim 1, wherein the said emulsion is a silver bromide emulsion which may have a silver iodide content of at most 8 mole % and having an average grain-size of at most 80 nm.
Claim 5
Dependent Claim
13 words
Photographic material comprising a support and an emulsion as defined in claim 1.
Claim 6
Dependent Claim
13 words
Photographic material according to claim 4, wherein the support is a glass support.
References Cited (Backward Citations)
US3379529A
Cited
US3705038A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |