Patents by Inventor Donald Irving Craft

Donald Irving Craft 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 of making a high melt viscosity block co-polyester
    Patent number: 4069278
    Abstract: A novel process is disclosed for preparing a high melt viscosity block co-polyester of at least two different linear polyesters. The process comprises melt blending the polyesters and, thereafter, subjecting the melt blended polyesters to a temperature of 10.degree.-50.degree. C. below the melting point of the lowest melting ingredient in the blend until the melt viscosity has increased to at least 10,000 poises at a temperature 10.degree.-15.degree. C. above the melting point of the blend.
    Type: Grant
    Filed: April 1, 1975
    Date of Patent: January 17, 1978
    Assignee: General Electric Company
    Inventors: Willem Frederik Hendrik Borman, Donald Irving Craft, Mortor Kramer