Patents by Inventor William Turnbull

William Turnbull 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).

  • Composition of poly(meta-phenylene isophthalamide) with additive for fabricating molded article
    Patent number: 3954703
    Abstract: A poly(meta-phenylene isophthalamide) powder is provided which is coalescible under the influence of pressure followed by heating at temperatures below its crystalline melting point to provide molded objects of a solid and homogeneous nature. A process for preparing coalescible powders of poly(meta-phenylene isophthalamide) also is provided wherein a solution of said polymer in a solvent such as DMAC is added to a precipitant such as water to provide a slurry which is filtered, followed by washing and drying the resulting filter cake to provide a crumb which is ground and screened through a sieve of 35 mesh size (U.S. Standard).
    Type: Grant
    Filed: May 1, 1974
    Date of Patent: May 4, 1976
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: John William Turnbull