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. 03, 2004
Filed:
Dec. 12, 2002
Masato Nishikata, Fukui-ken, JP;
Combex Ltd., Sabae, JP;
Abstract
A plastic bifocal lens includes a lens matrix. The front and rear sides of the lens matrix each include a far-sight section and a near-sight section. The front far-sight section has curvature which is smaller than the curvature of the rear far-sight section. The front near-sight section has a curvature that is larger than the curvature of the front far-sight section. The front and rear sides of the lens matrix are coated with a coating material having a lower refractive power than a material used to form the lens matrix. The curvatures at both the front and rear sides are formed to become smooth surfaces. The smooth surfaces prevent stains from being accumulated at specific locations on the front and rear surfaces.