Patents Represented by Attorney Allen M. Sokal

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  • Method for making polymeric filter aids and products thereof
    Patent number: 4145284
    Abstract: Improved, low-cost filter aid materials are made from polyurethane and related polymers. A foam of the polymeric material is comminuted to eliminate substantially all closed cells. The resulting particles are graded to a desired average particle size.
    Type: Grant
    Filed: March 24, 1978
    Date of Patent: March 20, 1979
    Assignee: Grefco, Inc.
    Inventor: Ernest L. Neu