US4414152A
Expired / Lapsed
US
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Bis aryl-azo derivatives of 2,3-naphthalenediol
Assignee: Eastman Kodak Co
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Filing: 1981-05-18
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Granted: 1983-11-08
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Expires: 2001-05-18
Abstract
Abstract Bis aryl-azo compounds of the formula ##STR1## wherein R 1 is lower alkyl and R 2 is fluoro or amino. The compounds are useful as neutral density pigments in electrophotographic developers and have good light stability.
Inventors
- 👤 Domenic Santilli
- 👤 Jeanne E. Kaeding
- 👤 Louis J. Rossi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:39
CPC Classifications
C; C09; C09B; C09B33/00; C09B33/02; C09B33/04; G; G03; G03G; G03G9/00; G03G9/08; G03G9/12; G03G9/122
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A compound of the formula ##STR10## wherein R 1 is lower alkyl and R 2 is --F or ##STR11## wherein R 3 and R 4 are hydrogen, lower alkyl, phenyl, naphthyl, or phenyl or naphthyl substituted by lower alkyl and are the same or different.
Claim 2
Dependent Claim
45 words
A compound of the formula ##STR10## wherein R 1 is lower alkyl and R 2 is --F or ##STR11## wherein R 3 and R 4 are hydrogen, lower alkyl, phenyl, naphthyl, or phenyl or naphthyl substituted by lower alkyl and are the same or different.
Claim 3
Dependent Claim
10 words
A compound according to claim 1 of the formula ##STR12##
Claim 4
Dependent Claim
10 words
A compound according to claim 1 of the formula ##STR13##
References Cited (Backward Citations)
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US603903A
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US2497246A
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US3077042A
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US4047944A
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US4247459A
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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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |