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Donald J. Ratkowski

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  • Mesa, AZ, US
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Patents Grantslast 30 patents

  • Information Patent Grant

    Lens mold assembly
    • Patent number 4,921,205
    • Issue date May 1, 1990
    • Sola USA, Inc.
    • Arthur J. Drew
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
  • Information Patent Grant

    Injection molding of contact lenses
    • Patent number 4,254,065
    • Issue date Mar 3, 1981
    • Donald J. Ratkowski
    • B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL