Patents by Inventor Romeo Conca

Romeo Conca 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 cellulose acetate
    Patent number: 4162359
    Abstract: Cellulose acetate is produced by subjecting highly purified cellulosic dissolving pulp to a bleaching sequence including at least one alkaline extraction stage and acetylating the bleached pulp to convert the pulp to cellulose acetate. The yellowness index of the cellulose acetate is reduced by carrying out the alkaline extraction stage in the presence of from 0.2 to 3.3%, based on dry pulp weight, of sodium or hydrogen peroxide.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: July 24, 1979
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Phyllis C. Leithem, Romeo Conca