Patents by Inventor W. Henrik Krohn

W. Henrik Krohn 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).

  • Stitch knitted filters for high temperature fluids and method of making them
    Patent number: 4181514
    Abstract: A dimensionally stable filter structure for high temperature applications and method of making it. The filter structure comprises at least one batt of relatively brittle fibers, known to possess outstanding degredation resistance at elevated temperatures, stitch-knitted with high temperature and corrosion resistant yarns.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: January 1, 1980
    Assignee: Huyck Corporation
    Inventors: Leonard R. Lefkowitz, W. Henrik Krohn
  • High temperature filter fabrics
    Patent number: 4113535
    Abstract: Generally, the present invention relates to a resin-treated filter fabric which comprises a surface or batt layer comprised of glass fibers which is joined, by needling, to an underlayer which is comprised of mineral fibers. The present invention includes within its scope a method of manufacturing such a filter fabric.
    Type: Grant
    Filed: September 12, 1977
    Date of Patent: September 12, 1978
    Assignee: Huyck Corporation
    Inventors: Leonard R. Lefkowitz, W. Henrik Krohn
  • High temperature filter fabrics
    Patent number: 4070519
    Abstract: Generally, the present invention relates to a resin-treated filter fabric which comprises a surface or batt layer comprised of glass fibers which is joined, by needling, to an underlayer which is comprised of mineral fibers. The present invention includes within its scope a method of manufacturing such a filter fabric.
    Type: Grant
    Filed: April 27, 1976
    Date of Patent: January 24, 1978
    Assignee: Huyck Corporation
    Inventors: Leonard R. Lefkowitz, W. Henrik Krohn