Patents Represented by Law Firm Freed, Kjelgaard, Griffin & Inskeep
  • Manufacture of visual lenses
    Patent number: 5281294
    Abstract: A consumable laser mask for forming a visual lens, especially a contact lens, in which at least a portion of the light passing through the lens is focussed by diffractive means. The laser mask is shaped to provide the diffractive means in the finished lens, and is made from a polymeric material with a thickness such that no residue is left at the completion of the laser ablation process. The invention also includes a method of manufacturing a lens using a consumable laser mask in accordance with the present invention.
    Type: Grant
    Filed: April 10, 1991
    Date of Patent: January 25, 1994
    Assignee: Pilkington Diffractive Lenses Limited
    Inventors: Michael H. Freeman, Colin M. Perrott