Patents by Inventor Neil J. Werthmann

Neil J. Werthmann 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).

  • Method of ventilating underground mines and improved brattice cloth construction useful therein
    Patent number: 4398451
    Abstract: An improved brattice cloth construction and method of utilizing the same in the ventilation of underground mines comprising a coherent, strong felt formed from a thick batting or mat of textile staple fibers needle-punched into dense, tightly intertwined and interlocking engagement, a flame retarding chemical impregnant in sufficient amount to impart to felt an acceptable flame resistance, and preferably an openwork substrate disposed within the staple fiber felt with staple fibers needle-punched therethrough and interconnected therewith.
    Type: Grant
    Filed: March 23, 1979
    Date of Patent: August 16, 1983
    Assignee: Polyweave Products, Inc.
    Inventor: Neil J. Werthmann