Patents by Inventor Erwin Irdham

Erwin Irdham 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).

  • Process for preparing high purity and crystalline dimethyl fumarate
    Patent number: 9422226
    Abstract: The present invention describes a process for the preparation of dimethyl fumarate. The process involves the esterification of fumaric acid and methanol in the presence of sulfuric acid as an acid catalyst. The high purity dimethyl fumarate contains no more than trace amounts of dimethyl sulfate. The present invention also provides a process for the preparation of highly pure dimethyl fumarate with a particle size from 20 to 250???.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: August 23, 2016
    Assignee: Biogen MA Inc.
    Inventors: John Guzowski, William Kiesman, Erwin Irdham