US3779766A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for developing photographic elements
Assignee: Individual
•
Filing: 1971-02-25
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Granted: 1973-12-18
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Expires: 1991-02-25
Abstract
Abstract There is disclosed a method for developing a photographic element which comprises developing a photographic element having photographic layers in a developer containing a water-soluble fluorescent whitening agent, wherein at least one of said photographic layers contains a particular water-soluble polymer or copolymer. In addition, the instant invention also extends to the photographic printing element employed in the method recited above.
Inventors
- 👤 N Tsuji
- 👤 T Tajima
- 👤 F Nishio
- 👤 T Miyazako
- 👤 Y Tsuchiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/815; G03C1/81; G03C1/8155; Y; Y10; Y10S; Y10S430/00; Y10S430/134
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
38 words
The method of claim 1 where said water-soluble flourescent whitening dye is selected from the group consisting of a diaminostilbene fluorescent dye, a benzidine fluorescent dye, a triazole fluorescent dye, an imidazole fluorescent dye and imidazolone fluorescent dye.
Claim 2
Dependent Claim
20 words
The method of claim 1 wherein said compound is selected from the group consisting of N-vinyl-N-methylformamide, N-vinyl-N-methylacetamide, N-vinyl-N-methylpropioneamide, and N-vinyl-N-ethylformamide.
Claim 3
Dependent Claim
30 words
The method of claim 1 wherein said photographic layer is selected from the group consisting of a baryta layer, an undercoating layer, a light-sensitive emulsion layer and a protective layer.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said photographic layer is a diffusion transfer image receiving layer.
Claim 5
Dependent Claim
11 words
The method of claim 1 wherein said member is a homopolymer.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein said member is a copolymer of said compound and another vinyl comonomer.
Claim 7
Dependent Claim
52 words
The method of claim 7 wherein said vinyl comonomer is selected from the group consisting of acrylamide, methacrylamide, N-methylacrylamide, N,N-dimethylacrylamide, N,N-diethylacrylamide, acrYloyl morpholine, N-methylolacrylamide, N-hydroxyethylacrylamide, acrylic acid, methacrylic acid, methyl acrylate, hydroxethyl acrylate, acrylonitrile, 1-vinyl-2-methylimidazole, N-vinylpyridine, 4-vinylpyridine, N-vinylpyrrolidone, N-vinyloxazolidinone, N-vinylcaprolactam, N-vinyl-5-methyl-2-oxazolidinone, vinyl acetate, maleic anhydride, sodium p-vinylbenzene sulfonate and methyl vinyl ether.
Claim 8
Dependent Claim
24 words
The method of claim 1 wherein the proportion of said vinyl comonomer is less than 20 mole percent of the total amount of copolymer.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein said polymer has a molecular weight of from about 50,000 to about 500,000.
Claim 10
Dependent Claim
30 words
The method of claim 1 wherein said polymer is employed in an amount of at least 5 percent by weight based upon the total weight of polymer and a binder.
References Cited (Backward Citations)
US3628957A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |