US4290955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3,6-Di(alkyl/phenyl)amino-9-carboxamidophenyl-xanthenes
Assignee: Polaroid Corp
•
Filing: 1980-05-30
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Granted: 1981-09-22
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Expires: 2000-05-30
Abstract
Abstract In one embodiment, the present invention is concerned with novel xanthene compounds of the formula <IMAGE> wherein each R1 the same or different is hydrogen or alkyl, each R2 the same or different is alkyl or phenyl, R3 is phenyl or alkyl, Y is an electron-withdrawing group and A is an anion. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds.
Inventors
- 👤 Louis Cincotta
- 👤 James W. Foley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:24
CPC Classifications
C; C07; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03C8/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A compound of the formula ##STR20## wherein each R 1 the same or different is hydrogen or alkyl having 1 to 4 carbon atoms, each R 2 the same or different is alkyl or phenyl having 1 to 4 carbon atoms, R 3 is phenyl or alkyl having 1 to 4 carbon atoms, Y is an electron-withdrawing group having a positive sigma value greater than 0.6 as defined by Hammett's Equation, and A is an anion.
Claim 2
Dependent Claim
76 words
A compound of the formula ##STR20## wherein each R 1 the same or different is hydrogen or alkyl having 1 to 4 carbon atoms, each R 2 the same or different is alkyl or phenyl having 1 to 4 carbon atoms, R 3 is phenyl or alkyl having 1 to 4 carbon atoms, Y is an electron-withdrawing group having a positive sigma value greater than 0.6 as defined by Hammett's Equation, and A is an anion.
Claim 3
Dependent Claim
13 words
A compound as defined in claim 1 wherein each R 1 is alkyl.
Claim 4
Dependent Claim
13 words
A compound as defined in claim 1 wherein each R 2 is alkyl.
Claim 5
Dependent Claim
12 words
A compound as defined in claim 1 wherein R 3 is alkyl.
Claim 6
Dependent Claim
3 words
The compound ##STR21##
Claim 7
Dependent Claim
3 words
The compound ##STR21##
Claim 8
Dependent Claim
12 words
A compound as defined in claim 4 wherein said alkyl is methyl.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |