Patent US2968498A successfully refreshed from Google Patents.
Patent US4003910A successfully refreshed from Google Patents.
US4003910A
Expired / Lapsed
US
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Meso-ionic se- and s-containing tetrazoles
Assignee: Polaroid Corp
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Filing: 1975-08-18
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Granted: 1977-01-18
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Expires: 1995-08-18
Abstract
Abstract This invention relates to meso-ionic tetrazole compounds of the formula: ##STR1## wherein X - is -S - or -Se - which are useful as photographic additives and to an intermediate useful in the preparation thereof having the formula: ##STR2##
Inventors
- 👤 James R. Bartels-Keith
- 👤 Mary T. Burgess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
C; C07; C07D; C07D257/00; C07D257/02; C07D257/04; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C07D277/68; C07D277/70; C07D277/72; C07D293/00; C07D293/10; C07D293/12; G; G03; G03C; G03C8/00; G03C8/24; G03C8/243; Y; Y10; Y10S; Y10S430/00; Y10S430/166
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
15 words
A compound of the formula ##STR21##wherein X - is --S - or --Se - .
Claim 2
Dependent Claim
15 words
A compound of the formula ##STR21##wherein X - is --S - or --Se - .
Claim 3
Dependent Claim
12 words
The compound of claim 1 wherein X - is --S - .
Claim 4
Dependent Claim
12 words
The compound of claim 1 wherein X - is --Se - .
Claim 5
Dependent Claim
3 words
The compound ##STR22##
Claim 6
Dependent Claim
3 words
The compound ##STR22##
Claim 7
Dependent Claim
30 words
A process which comprises reacting 5-methylthio-1-phenyltetrazole and triethyloxonium fluoroborate at a temperature of between about 15° and 40° C. in anhydrous dichloromethane to yield 3-ethyl-5-methylthio-1-phenyltetrazolium fluoroborate and isolating said fluoroborate.
Claim 8
Dependent Claim
30 words
A process which comprises reacting 5-methylthio-1-phenyltetrazole and triethyloxonium fluoroborate at a temperature of between about 15° and 40° C. in anhydrous dichloromethane to yield 3-ethyl-5-methylthio-1-phenyltetrazolium fluoroborate and isolating said fluoroborate.
Claim 9
Dependent Claim
48 words
The process of claim 5 which includes the additional step of reacting said 3-ethyl-5-methylthio-1-phenyltetrazolium fluoroborate at a temperature of between about 0° and 10° C. with (a) sodium hydrogen selenide in aqueous alkanol solution or (b) sodium hydrogen sulfide in alkanol solution to yield the corresponding meso-ionic compound.
Claim 10
Dependent Claim
18 words
The process of claim 6 wherein said fluoroborate is reacted with sodium hydrogen selenide in aqueous ethanol solution.
Claim 11
Dependent Claim
17 words
The process of claim 6 wherein said fluoroborate is reacted with sodium hydrogen sulfide in methanol solution.
References Cited (Backward Citations)
DE1037176B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |