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:
May. 07, 2024
Filed:
Nov. 03, 2021
Alcon Inc., Fribourg, CH;
Yuan Chang, Atlanta, GA (US);
Junhao Ge, Redwood City, CA (US);
Steve Yun Zhang, Sugar Hill, GA (US);
Alcon Inc., Fribourg, CH;
Abstract
Described herein is a method for producing photochromic contact lenses, in particular, photochromic silicone hydrogel contact lenses. The method comprises a step of cast molding of a lens-forming composition including a vinylic monomer having a primary amino or thiolactone group to form an unprocessed contact lens having the polymer matrix of which have pendant primary amino or thiolactone groups, a step of one-pot multistep reactions based on thiolactone chemistry (aminolysis and thiol-induced graft polymerization of a photochromic vinylic monomer to the polymer matrix) which are carried out only in its central region which is circular and concentric with the central axis of the unprocessed contact lens. The obtained photochromic contact lens has a central pupillary region that only can undergo a reversible color change upon exposure to UV/HEVL-radiation.