US4182714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbazole containing phthalides
Assignee: HD ACQUISITION CORP A CORP OF DE
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Filing: 1977-08-04
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Granted: 1980-01-08
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Expires: 1997-08-04
Abstract
Abstract 3-Heteroaryl-3-(diphenylamino)phthalides useful as color formers in pressure-sensitive carbonless duplicating systems, thermal marking systems and hectographic copying systems are prepared by reacting 2-(heteroarylcarbonyl)-benzoic acids with diphenylamines.
Inventors
- 👤 Paul J. Schmidt
- 👤 William M. Hung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:26
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/90; B; B41; B41M; B41M5/00; B41M5/124; B41M5/132; B41M5/136; B41M5/145; B41M5/26; B41M5/30; B41M5/323; B41M5/327
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
A compound having the formula ##STR22## wherein: Q is selected from the group consisting of di-lower-alkylamino, nitro, halo and COX where X is hydroxyl, benzyloxy, alkoxy having from 1 to 18 carbon atoms or OM where M is an alkali metal cation, an ammonium cation or a mono-, di- or trialkylammonium cation having from 1 to 18 carbon atoms; n is 0; or 1 when Q is di-lower-alkylamino, nitro or COX; or from 1 to 4 when Q is halo; Y 1 , Y 2 , Y 3 and Y 4 are the same or different and are selected from the group consisting of hydrogen, halo, hydroxyl, lower-alkoxy, alkyl having from 1 to 9 carbon atoms, phenyl-lower-alkyl, COOR 4 and NR 5 R 6 where R 4 and R 5 are hydrogen or lower-alkyl and R 6 is hydrogen, lower-alkyl, cycloalkyl having from 5 to 7 carbon atoms, or lower alkanoyl; Z is a radical having the formula ##STR23## in which R is hydrogen or non-tertiary alkyl having from 1 to 4 carbon atoms.
Claim 2
Dependent Claim
174 words
A compound having the formula ##STR22## wherein: Q is selected from the group consisting of di-lower-alkylamino, nitro, halo and COX where X is hydroxyl, benzyloxy, alkoxy having from 1 to 18 carbon atoms or OM where M is an alkali metal cation, an ammonium cation or a mono-, di- or trialkylammonium cation having from 1 to 18 carbon atoms; n is 0; or 1 when Q is di-lower-alkylamino, nitro or COX; or from 1 to 4 when Q is halo; Y 1 , Y 2 , Y 3 and Y 4 are the same or different and are selected from the group consisting of hydrogen, halo, hydroxyl, lower-alkoxy, alkyl having from 1 to 9 carbon atoms, phenyl-lower-alkyl, COOR 4 and NR 5 R 6 where R 4 and R 5 are hydrogen or lower-alkyl and R 6 is hydrogen, lower-alkyl, cycloalkyl having from 5 to 7 carbon atoms, or lower alkanoyl; Z is a radical having the formula ##STR23## in which R is hydrogen or non-tertiary alkyl having from 1 to 4 carbon atoms.
Claim 3
Dependent Claim
5 words
3-[N-(4-ethoxyphenyl)-N-phenylamino]-3-(9-ethyl-3-carbazoyl)phthalide according to claim 1.
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) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |