Patents by Inventor Tamara G. Levina

Tamara G. Levina 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: 4110395
    Abstract: A process for producing polymeric films from crystallizable polyesters, such as polyethylene terephthalate, comprising extruding a molten polymer onto a receiving surface with subsequent cooling of the polymer on said surface at 20.degree.-80.degree. C. to obtain an amorphous polymeric film. This film is heat-treated at 130.degree.-190.degree. C. to obtain a crystallinity of the film of 5-50%. Then the film is oriented at 130.degree.-250.degree. C., thermally fixed at 170.degree.-250.degree. C. and cooled at 20.degree.-30.degree. C. Polymeric films produced by the above-described method have a high structural homogeneity and elevated physical and mechanical characteristics (ultimate tensile strength up to 4000 kg/cm.sup.2, yield point up to 3500 kg/cm.sup.2).
    Type: Grant
    Filed: October 19, 1976
    Date of Patent: August 29, 1978
    Inventors: Modest S. Akutin, Tamara G. Levina