Patents by Inventor Norvell E. Wisdom, Jr.

Norvell E. Wisdom, Jr. 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).

  • Patent number: 4084941
    Abstract: A woven cellulosic cloth backing of cotton or rayon yarns for the manufacture of coated abrasives, particularly for the manufacture of coated abrasive belts for wet grinding, includes a backsize, of phenolic resin which may be admixed with a polymer having a glass transition temperature between 10.degree. and 40.degree. C, said backsize being directly adhered to the yarns of cloth, a polymeric film forming resin adhered to the yarns of cloth to which the backsize is not adhered, said resin having a glass transition temperature between 20.degree. and 50.degree. C, and a front size of a mixture of phenol-formaldehyde resin and the film former resin coating above referred to. An additional front coating of phenol-formaldehyde resin may be employed to provide a smooth surface for the application of a fine grit abrasive.
    Type: Grant
    Filed: March 31, 1976
    Date of Patent: April 18, 1978
    Assignee: Norton Company
    Inventors: William H. Cox, Norvell E. Wisdom, Jr.