Patents by Inventor Colin Hewlett

Colin Hewlett 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).

  • Preparation of carboxylic acid anhydrides
    Patent number: 4698187
    Abstract: A carboxylic acid anhydride such as acetic anhydride, is prepared from a carboxylate ester or a hydrocarbyl ether in processes comprising the use of a halide, carbon monoxide and a Group VIII noble metal.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: October 6, 1987
    Assignee: The Halcon SD Group, Inc.
    Inventor: Colin Hewlett
  • Preparation of carboxylic acid anhydrides
    Patent number: 4559183
    Abstract: A carboxylic acid anhydride such as acetic anhydride, is prepared from a carboxylate ester or a hydrocarbyl ether in processes comprising the use of a halide, carbon monoxide and a Group VIII noble metal.
    Type: Grant
    Filed: August 27, 1984
    Date of Patent: December 17, 1985
    Assignee: The Halcon SD Group, Inc.
    Inventor: Colin Hewlett