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. 21, 2002
Filed:
May. 30, 2000
Alan D. Maki, Chaska, MN (US);
Jeffrey L. VerMurlen, Brooklyn Park, MN (US);
David C. Olund, Stanchield, MN (US);
Vision-Ease Lens, Inc., Ramsey, MN (US);
Abstract
Multifocal ophthalmic lenses may be manufactured by either injection molding and casting methodologies. The use of two opposed tools (mold faces) with relatively centered faces, but with significantly differing diameters can be used to provide multifocal ophthalmic lenses. The process is surprisingly capable of providing multifocal lenses with good control of the thickness of the lenses, with relatively thin center thicknesses (e.g., less than 4.7 mm, or less than 3.5 mm) and relatively thin edge thicknesses (e.g., 0.5 to 2.5 or to 2.0 mm). The tool faces (the molds for the front and rear surfaces) may be readily replaced within the mold to enable manufacture of a wide range of lens prescriptions with minimum down time.