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:
Jan. 26, 2016
Filed:
Nov. 16, 2011
Haifeng Shan, Shrewsbury, MA (US);
Marvin Pounders, St. Petersburg, FL (US);
Richard Muisener, Tarpon Springs, FL (US);
Bill Houle, Clarksburg, WV (US);
Zeming Gou, Pearisburg, VA (US);
Haifeng Shan, Shrewsbury, MA (US);
Marvin Pounders, St. Petersburg, FL (US);
Richard Muisener, Tarpon Springs, FL (US);
Bill Houle, Clarksburg, WV (US);
Zeming Gou, Pearisburg, VA (US);
Essilor International, Charenton-le-Pont, FR;
Abstract
A process is described for manufacturing an ophthalmic lens containing a Fresnel microstructured surface inside the lens. The Fresnel lens is injection molded with a mold insert having a heat conductivity lower than the thermoplastic material used to form the Fresnel lens. A second thermoplastic material is overmolded to the Fresnel lens to cover and protect the microstructured surface. The mold insert is made from nickel or a thermoplastic material. The resulting lens includes two layers having different refractive indices. The Fresnel lens may be made from polycarbonate while the overmold may be made from a poly(methyl methacrylate) or a thermoplastic polyurethane.