Patents by Inventor Rabih Julien Rached

Rabih Julien Rached 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).

  • Synthesis of (meth)acrylic anhydride by transanhydrization
    Patent number: 9266811
    Abstract: The present invention relates to a process for preparing an anhydride of formula A-C(?O)—O—(O?)C-A, where A is —CR?CH2 and R is —H or —CH3, comprising: a) a step of reacting an anhydride B—C(?O)—O—(O?)C—B with an acid A-COOH, A being as defined above, wherein the step results in the formation of an anhydride A-C(?O)—O—(O?)C—B and of an acid B—COOH, A and B being such that said acid B—COOH is more volatile than said acid A-COOH, and b) a step of reacting said anhydride A-C(?O)—O—(O?)C—B with the acid A-COOH under conditions such that the amount of acid B—COOH is less than the amount of acid A-COOH, resulting in the formation of the anhydride A-C(?O)—O—(O?)C-A, in which said reaction steps are carried out in the presence of an acid catalyst which is more volatile than said anhydride A-C(?O)—O—(O?)C-A.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: February 23, 2016
    Assignee: Rhodia Operations
    Inventors: Pierre Marcel Ardaud, Rabih Julien Rached, Thierry Alban Marcel Vidal
  • Synthesis of (meth)acrylic anhydride by transanhydrization
    Publication number: 20150203433
    Abstract: The present invention relates to a process for preparing an anhydride of formula A-C(?O)—O—(O?)C-A, where A is —CR?CH2 and R is —H or —CH3, comprising: a) a step of reacting an anhydride B—C(?O)—O—(O?)C—B with an acid A-COOH, A being as defined above, wherein the step results in the formation of an anhydride A-C(?O)—O—(O?)C—B and of an acid B—COOH, A and B being such that said acid B—COOH is more volatile than said acid A-COOH, and b) a step of reacting said anhydride A-C(?O)—O—(O?)C—B with the acid A-COOH under conditions such that the amount of acid B—COOH is less than the amount of acid A-COOH, resulting in the formation of the anhydride A-C(?O)—O—(O?)C-A, in which said reaction steps are carried out in the presence of an acid catalyst which is more volatile than said anhydride A-C(?O)—O—(O?)C-A.
    Type: Application
    Filed: July 11, 2013
    Publication date: July 23, 2015
    Inventors: Pierre Marcel Ardaud, Rabih Julien Rached, Thierry Alban Marcel Vidal