Patents by Inventor Isaac L. Langley

Isaac L. Langley 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).

  • Filter assembly for molten polymeric material
    Patent number: 4921607
    Abstract: The prefilter assembly is provided with a central cavity in which a plurality of tubular porous tubular elements are provided with the remaining space being filled by a mass of shattered metal particles. During filtration, the shattered metal particles eliminate dead space within the filter while also filtering out micro gels which may be in the polymeric material. The shattered metal particles also reduce the possibility of gel formation due to cross-linking of the polymer mass therethrough.
    Type: Grant
    Filed: February 25, 1988
    Date of Patent: May 1, 1990
    Assignee: Hoeganaes Corporation
    Inventor: Isaac L. Langley
  • Prefilter device for polymeric material
    Patent number: 4661249
    Abstract: The filter assembly is constructed of outer sleeves of wire screen, a mass of shattered metal particles within the sleeves and at least one tubular filter element within the shattered metal particles. The mass of shattered metal particles serves to remove micro-gels from the polymeric material flowing through the filter assembly while the inner filter element serves to remove particulate matter.
    Type: Grant
    Filed: January 28, 1985
    Date of Patent: April 28, 1987
    Assignee: Metallurgical Industries, Inc.
    Inventor: Isaac L. Langley