Witt Alvin E, Breault Homer: Dimensionally-stable, resilient floor tile. Atlantic Richfield Company, Ewbank John R, September 2, 1975: US3902293 (170 worldwide citation)

A multilayer floor tile is so dimensionally stable that large gymnasiums can be floored with it while achieving sufficient resilience to be suitable as a basketball floor. The bottom layer imparts durable resiliency because it is a sheet molded from a tangled network of thermoplastic fibers containi ...