Patents by Inventor Daniel Clerin

Daniel Clerin 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).

  • Method and installation for separating and purifying diphenols in the phenol and phenol derivatives industry
    Patent number: 6844472
    Abstract: A method and installation for separating and purifying a crude mixture containing hydroquinone, resorcinol and possibly tars and/or catechol, comprising the following steps: —a possible distillation stage (I) in order to obtain a catechol head, —the foot (I) or crude mixture undergoes distillation (II) in order to obtain a fraction that is rich in resorcinol, —the foot of (II) undergoes distillation (III) in order to obtain a fraction that is rich in hydroquinone, whereupon said rich fractions are refined (IV or V). Preferably, one or several stages in which tar is removed (I,I?) precede stage (I) or (II).
    Type: Grant
    Filed: January 25, 2000
    Date of Patent: January 18, 2005
    Assignee: Rhodia Chimie
    Inventors: Jacques Bourdon, Daniel Clerin