Patents by Inventor Esko Haukkovaara

Esko Haukkovaara 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 the preparation of viscose
    Patent number: 4210747
    Abstract: A process for the preparation of viscose by adding to cellulose pulp, manufactured by alkali cooking without prehydrolysis or by acid cooking without alkali extraction, steeping lye and an organic compound, steeping the pulp to form alkali cellulose, aging the alkali cellulose, xanthating the aged alkali cellulose with carbon disulfide to obtain cellulose xanthate and dissolving the cellulose xanthate to obtain viscose.
    Type: Grant
    Filed: August 4, 1978
    Date of Patent: July 1, 1980
    Assignee: Kemira Oy
    Inventors: Erkki Sorsa, Esko Haukkovaara, Jan Fors