Patents Assigned to Polyweave Products, Inc.
  • 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