Patents by Inventor Donald L. Vincent

Donald L. Vincent 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).

  • Production of syringealdehyde from hardwood waste pulping liquors
    Patent number: 4075248
    Abstract: Syringealdehyde and vanillin are produced from alkaline or neutral sulphite waste liquors by alkaline oxidative treatment of the liquor and subsequent isolation of a mixture of the aldehydes. Syringealdehyde is separated from vanillin by fractional distillation.
    Type: Grant
    Filed: September 7, 1976
    Date of Patent: February 21, 1978
    Assignee: Domtar Limited
    Inventors: Harry Borden Marshall, Donald L. Vincent