Patents Represented by Attorney John J. Hardaway

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  • Method of heat sealing thermoplastic sheets together using a split laser beam
    Patent number: 3989778
    Abstract: Thermoplastic materials, particularly material in sheet form, may be sealed or thermowelded together using the energy from a single laser beam source by splitting the beam and directing it by mirrors to desired seal areas on the opposed sides of the materials to be sealed. The beam may be split in proportion to the thickness of the respective materials. Heating the opposed sides of materials to be sealed avoids the problem of overheating or burning the side to which energy is applied.
    Type: Grant
    Filed: December 17, 1975
    Date of Patent: November 2, 1976
    Assignee: W. R. Grace & Co.
    Inventor: Richard F. Osborne