The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2009
Filed:
Feb. 07, 2008
Barry Van Gemert, Pitcairn, PA (US);
Anil Kumar, Murrysville, PA (US);
Frank P. Mallak, Export, PA (US);
Robert W. Walters, Export, PA (US);
Barry Van Gemert, Pitcairn, PA (US);
Anil Kumar, Murrysville, PA (US);
Frank P. Mallak, Export, PA (US);
Robert W. Walters, Export, PA (US);
Transition Optical, Inc., Pinellas Park, FL (US);
Abstract
Described are contact lenses having photochromic materials within the central or pupillary area of the lens and methods for manufacturing such lenses. In one method, a photochromic amount of at least one photochromic material is added to the pupillary region of a casting mold containing a polymerizable monomer that can be at least partially cured before and/or after the addition. Another method involves providing an amount of polymerizable photochromic monomer for the pupillary region and an amount of polymerizable non-photochromic monomer for the remainder of the contact lens in a casting mold. The photochromic and non-photochromic monomers can differ by their degree of polymerization, viscosity and/or density.