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US3859341A Expired / Lapsed US ⏱️ 0.0 years remaining

3,3'disubstituted benzidine derivatives

Assignee: Phadia AB
•
Filing: 1971-02-24
•
Granted: 1975-01-07
•
Expires: 1991-02-24
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Abstract

Abstract Disclosed are disubstituted benzidine derivatives having on both the 3- and 3''-position a substituent W-X-A-On-, subscript n is zero or one, A is a divalent lower alkylene chain with from about 2 to about 7 carbons, X is the divalent carbonyloxy or sulfonyloxy group, W is hydrogen or other chromogen-reactiveindicator compatible cation; and the chromogen-reactive-indicator compatible acid addition salts of those benzidine derivatives. Also disclosed is the improvement in an analytical test, wherein is used a color change reagent preparation comprising peroxidase, an oxygen-oxidoreductase specific to a particular substance to be tested and for which there exists a specific oxygenoxidoreductase, and a chromogen-reactive-indicator which is one of the foregoing disubstituted benzidine derivatives or a chromogen-reactive-indicator compatible acid addition salt of it.

Inventors

  • 👤 Nils Ake Jonsson
  • 👤 Ferenc Merenyi
  • 👤 Lars-Erik Westlund

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 21:24
CPC Classifications
C; C07; C07D; C07D223/00; C07D223/14; C07D223/16; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/28; C12Q1/54; C12Q2326/00; C12Q2326/10

Claims Analysis

Total Claims: 13
Claim 1
Independent Claim 13 words
A 3,33'' -DISUBSTITUTED BENZIDINE DERIVATIVE SELECTED FROM (A) THOSE HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim 13 words
A 3,33'' -DISUBSTITUTED BENZIDINE DERIVATIVE SELECTED FROM (A) THOSE HAVING THE GENERAL FORMULA
Claim 3
Dependent Claim 18 words
The 3,3''-disubstituted benzidine derivative as claimed in claim 1, wherein W is hydrogen or an alkali metal cation.
Claim 4
Dependent Claim 13 words
The 3,3''-disubstituted benzidine derivative as claimed in claim 1, wherein n is one.
Claim 5
Dependent Claim 13 words
The 3,3''-disubstituted benzidine derivative as claimed in claim 3, wherein W is hydrogen.
Claim 6
Dependent Claim 2 words
Gamma,gamma''-(4,4''-diamino-3,3''-biphenyldioxy)dibutyric acid.
Claim 7
Dependent Claim 2 words
Gamma,gamma''-(4,4''-diamino-3,3''-biphenyldioxy)dibutyric acid.
Claim 8
Dependent Claim 36 words
A hydrogen halogenic acid, sulfuric acid, phenylsulfonic acid, toluene sulfonic acid or naphthalene sulfonic acid addition salt as claimed in claim 1, wherein n is 1, A is a divalent trimethylene group, and W is hydrogen.
Claim 9
Dependent Claim 12 words
The dihydrochloride of the 3,3''-disubstituted benzidine derivative as claimed in claim 6.
Claim 10
Dependent Claim 12 words
The 3,3''-disubstituted derivative as claimed in claim 1, wherein n is zero.
Claim 11
Dependent Claim 12 words
The 3,3''-disubstituted derivative as claimed in claim 8, wherein W is hydrogen.
Claim 12
Dependent Claim 2 words
Delta,delta''-(4,4''-diamino-3,3''-biphenyl)divaleric acid.
Claim 13
Dependent Claim 2 words
Delta,delta''-(4,4''-diamino-3,3''-biphenyl)divaleric acid.

References Cited (Backward Citations)

US2724722A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1978-01-06 1978-07-08 1979-01-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1982-01-06 1982-07-08 1983-01-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1986-01-06 1986-07-08 1987-01-07 $7700.00 Window Closed / Lapsed

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