US3590692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide developing agents and photographic process
Assignee: Polaroid Corp
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Filing: 1968-07-01
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Granted: 1971-07-06
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Expires: 1988-07-01
Abstract
Abstract Photographic process and product employing silver halide developing agents of quaternary ammonium compounds of the formula:
Inventors
- 👤 Stanley M Bloom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:51
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/06; C07D213/16; C07D213/20; C07D215/00; C07D215/02; C07D215/04; C07D215/10; G; G03; G03C; G03C5/00; G03C5/26; G03C5/29; G03C5/30; G03C5/3021; G03C8/00; G03C8/32; G03C8/36; Y; Y10; Y10S; Y10S430/00; Y10S430/142
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
(Amended) The process of claim 1, the step which comprises conducting said process in the presence of at least one compound selected from those represented by the formulae:
Claim 2
Dependent Claim
48 words
The process as defined in claim 1 wherein the compound represented by the formula: 1-Ae-R-D is selected from the group consisting of N- gamma (2'', 5 '' dihydroxyphenyl) propyl- pyridinium bromide, N- gamma ( 2 '', 5 ''-dihydroxyphenyl) propyl-2''''-methyliquinolinium bromide and N- gamma (2'', 5''-dihydroxyphenyl) propyl- 4''''-methyliquinolinium bromide.
Claim 3
Dependent Claim
166 words
The process of developing a latent image in a silver halide emulsion which comprises treating said emulsion with an aqueous alkaline solution in the presence of a compound selected from those represented by the formula: L-A-R-D wherein L is an unsubstituted, alkylsubstituted or halogen substituted monovalent radical selected from the group consisting of phenyl and naphthyl rings substituted in ortho or para positions with respect to each other by Delta -OH and Delta -NH2, at least one of said positions being substituted by Delta -OH; A is selected from the group consisting of oxygen and sulfur; e is 1 or 0; R is a divalent radical of the formula:-CH2 (OC2H4m-(CH2n -CH2-or -CH2(SC2H4m -(CHz n-CH2 -wherein m is a number from 0 to 4 inclusive; n is a number from 0 to 8 inclusive; the sum of m + n being not greater than 8; D is a cyclic, acyclic, or part cyclic part acyclic quaternary ammonium radical selected from the group of radicals of the formulae:
Claim 4
Dependent Claim
27 words
(Amended) The process of developing a latent image as in claim 4 which comprises treating said emulsion with a compound selected from those represented by the formulae:
Claim 5
Dependent Claim
53 words
A process of developing a latent image in a silver halide emulsion which comprises treating said emulsion with an aqueous alkaline solution in the presence of a compound selected from the group consisting of N- gamma (2'', 5''-dihydroxyphenyl) propyl-pyridinium bromide, N- gamma ( 2'', 5''-dihydroxyphenyl) propyl-4-methylquinolinium bromide and N- gamma (2'', 5''-dihydroxyphenyl)propyl-2-methylquinolinium bromide.
Claim 6
Dependent Claim
36 words
(Amended) A photographic product comprising a plurality of layers, at least one of said layers including a silver halide emulsion, and at least one of said layers including a compound selected from those of the formulae:
Claim 7
Dependent Claim
51 words
A photographic product comprising a plurality of layers, at least one of said layers including a silver halide emulsion, and at least one of said layers including a compound selected from the group consisting of N- gamma (2'', 5''-dihydroxyphenyl)propyl-pyridinium bromide, N- gamma (2'',5''-dihydroxyphenyl)propyl-4-methylquinolinium bromide and N- gamma (2'', 5''-dihydroxyphenyl) propyl-2-methylquinolinium bromide.
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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |