Patents by Inventor Frank M. Silver

Frank M. Silver 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 for preparing anisotropic oleum dopes of polyamides by polymerizing in sulfur trioxide
    Patent number: 4148774
    Abstract: Anisotropic dopes composed of an aromatic polyamide in oleum are produced by polymerizing an aromatic diamine such as p-phenylenediamine sulfate and an aromatic diacid such as terephthalic acid in sulfur trioxide.
    Type: Grant
    Filed: April 7, 1978
    Date of Patent: April 10, 1979
    Assignee: Monsanto Company
    Inventor: Frank M. Silver
  • Preparation of oxadiazole copolymer solution from scrap copolymer
    Patent number: 4118358
    Abstract: A process for utilizing scrap aromatic oxadiazole/N-alkyhydrazide copolymer by dissolving the scrap copolymer in oleum thereby effecting degradation thereof and heating the resulting solution at a temperature between about 100.degree. C. and 160.degree. C. to form a polymer solution. Articles such as fibers can be shaped from this solution by combining the solution with an aqueous medium such as water.
    Type: Grant
    Filed: March 10, 1977
    Date of Patent: October 3, 1978
    Assignee: Monsanto Company
    Inventors: Frank M. Silver, Hartwig C. Bach