Patents by Inventor André Hayoz

André Hayoz has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Bridged diaminopyrazole compounds and dye compositions containing same
    Patent number: 6716257
    Abstract: The new diaminopyrazole compounds are bridged 4,5-diaminopyrazole compounds or salts thereof.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: April 6, 2004
    Assignee: Wella Aktiengesellschaft
    Inventors: Otto Goettel, Aline Pirrello, André Hayoz, Emmanuel Morand
  • Process for making 2-aminomethyl-1, 4-diaminobenzene and its salts and compositions and methods for dyeing keratin fibers using same
    Patent number: 6461390
    Abstract: A process is described for making 2-aminomethyl-1,4-diaminobenzene, or a physiologically compatible salt of 2-aminomethyl-1,4-diaminobenzene, of formula (I): wherein n is a number from 0 to 3 and HX represents an inorganic or organic salt. In this process 2-(N-acylaminomethyl)-4-nitrophenol is first reacted with a halogen acetamide to form 2-(2-N-acylaminomethyl-4-nitrophenoxy)acetamide, which is then converted to 2-(N-acylaminomethyl)-4-nitroaniline. Subsequently the 2-(N-acylaminomethyl)4-nitroaniline is reduced to form 1,4-diamino-2-(N-acylaminomethyl)benzene, which is then deacylated by adding hydrochloric acid in a sufficient amount so that 1,4-diamino-2-aminomethylbenzene trihydrochloride is formed. Then the trichloride is converted to the free base form, 1,4-diamino-2-aminomethylbenzene, or to another salt of 1,4-diamino-2-amino-methylbenzene when n≠0 with the proviso that if n=3 HX is not hydrochloric acid.
    Type: Grant
    Filed: September 22, 2000
    Date of Patent: October 8, 2002
    Assignee: Wella Aktiengesellschaft
    Inventors: Otto Goettel, Aline Pirrello, André Hayoz