US3975423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkylthioalkyl-substituted alkylsulfonylacetonitriles
Assignee: Polaroid Corp
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Filing: 1975-05-08
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Granted: 1976-08-17
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Expires: 1995-05-08
Abstract
Abstract This application is directed to compounds of the formula ##EQU1## wherein R 1 and R 2 each represent lower alkyl and m is a whole number 2 to 5, preferably 2 or 3. These compounds are useful as silver halide solvents in photography.
Inventors
- 👤 Alan L. Borror
- 👤 Richard B. Greenwald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:52
CPC Classifications
C; C07; C07C; C07C323/00; C07C323/50; C07C323/51; C07C323/60; G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C8/00; G03C8/32; G03C8/36; G03C8/365
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
31 words
A compound of the formula ##EQU2## wherein R 1 and R 2 each represent lower alkyl containing 1 to 4 carbon atoms and m is a whole number 2 to 5.
Claim 2
Dependent Claim
31 words
A compound of the formula ##EQU2## wherein R 1 and R 2 each represent lower alkyl containing 1 to 4 carbon atoms and m is a whole number 2 to 5.
Claim 3
Dependent Claim
11 words
A compound as defined in claim 1 wherein m is 2.
Claim 4
Dependent Claim
11 words
A compound as defined in claim 1 wherein m is 3.
Claim 5
Dependent Claim
12 words
A compound as defined in claim 1 wherein R 1 is methyl.
Claim 6
Dependent Claim
12 words
A compound as defined in claim 1 wherein R 2 is methyl.
Claim 7
Dependent Claim
6 words
The compound having the formula ##STR6##
Claim 8
Dependent Claim
6 words
The compound having the formula ##STR6##
Claim 9
Dependent Claim
6 words
The compound having the formula ##STR7##
Claim 10
Dependent Claim
6 words
The compound having the formula ##STR7##
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |