Patent · US Expired

4,5-dIiminopyrazolines, processes for their preparation, and their application in keratin fiber dyeing compositions and processes

US5931973A · kind A · utility

22Cited by
5References
38Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMar 21, 1997
Grant dateAug 3, 1999
Priority date—
Expiry dateMar 21, 2017

Classification

  • Technology area (CPC A)Human Necessities
  • CPC primaryA61Q5/065
  • WIPO fieldPharmaceuticals
  • WIPO sectorChemistry

Abstract

Dyes selected from 4,5-diiminopyrazolines or their 4-ylideneamino-5-aminopyrazole tautomeric forms, a process for their preparation, and their use as direct dyes in dye compositions for keratin fibers, in particular for human keratin fibers. The dyes may also be used in lightening or non-lightening dye compositions for the direct dyeing of keratin fibers, and in dyeing processes using these compositions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.