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:
Aug. 30, 2022
Filed:
Mar. 27, 2019
Alcon Inc., Fribourg, CH;
Daqing Wu, Suwanee, GA (US);
Steve Yun Zhang, Sugar Hill, GA (US);
Junhao Ge, Johns Creek, GA (US);
Richard Charles Breitkopf, Dunwoody, GA (US);
Augustine Twum Kumi, Grayson, GA (US);
Weihong Lang, Suwanee, GA (US);
Alcon Inc., Fribourg, CH;
Abstract
The invention provides a method for making silicone hydrogel contact lenses. The method of the invention is characterized by using an organic solvent as a processing-aid tool for controlling lens diameter without significantly affecting lens equilibrium water content during cast-molding of soft contact lenses from a polymerizable composition. By adjusting the weight percentage of the organic solvent in a polymerizable composition for making SiHy contact lenses, one can adjust lens diameter of produced SiHy lenses to meet target without affecting adversely the lens properties.