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US3687972A Expired / Lapsed US ⏱️ 0.0 years remaining

AMINE DERIVATIVES OF 1,2-DIHYDROBENZ {8 cd{9 {11 INDOLES

Assignee: Wyeth Holdings LLC
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Filing: 1970-09-02
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Granted: 1972-08-29
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Expires: 1990-09-02
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Abstract

Abstract WHEREIN R is hydrogen or methyl; R'' is a monovalent aromatic radical selected from phenyl, naphthyl and biphenylyl; R'''' is a divalent radical selected from phenylene, naphthylene, biphenylylene and sulfonylbisphenylene; said R'' and R'''' being either unsubstituted or substituted, the substituents of R'' being selected from the group consisting of lower-alkoxy, lower-alkyl, lower-alkylsulfonyl, anilino, benzoyl, 4-carboethoxyphenylazo, carboxymethylcarbamoyl, chloro, lower-dialkylamino, lowerdialkylsulfamoyl, di-(2-carbamoylethyl)sulfamoyl, hydroxy, 2hydroxyethyl, 4-(2-hydroxyethyl)phenylazo, 2hydroxyethylsulphenoxy, sulfamoyl and trifluoromethyl, the substituents of R'''' being selected from the group consisting of chloro and methoxy; said compound being in the form of its free base of formula I and II, or hydrohalide salt thereof. Amine derivatives of 1,2-dihydrobenz (cd) indoles, useful as disperse dyes for synthetic fibers are provided. They conform to the formula selected from

Inventors

  • 👤 Thurairajah Padmanathan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 04:44
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/80; C07D209/90

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 1 words
1,2-Dihydro-2-(p-(2-hydroxyethoxycarbonyl)phenyl-imino)benz(cd)indole.
Claim 2
Dependent Claim 1 words
1,2-Dihydro-2-((p-methylthio)phenylimino)benz-(cd)indole.
Claim 3
Dependent Claim 1 words
2-(4-Chloro-1-naphthylimino-1,2-dihydro-1-methyl-benz(cd)indole.
Claim 4
Dependent Claim 1 words
N-Benz(cd)indole-2-(1H)-ylidene-2,2''-dichlorobenzidine.

References Cited (Backward Citations)

US3362953A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-08-29 1976-02-28 1976-08-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-08-29 1980-02-28 1980-08-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-08-29 1984-02-28 1984-08-29 $7700.00 Window Closed / Lapsed

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