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:
Apr. 06, 1999
Filed:
Oct. 20, 1997
Applicant:
Inventors:
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02C / ;
U.S. Cl.
CPC ...
351169 ;
Abstract
A progressive multifocal lens is provided with a near part N, a defined vision part F, and an intermediate part P along the main meridian curve MM'. The near center B of the lens is separated from near eyepoint E by a distance of substantially 2 mm to 8 mm in the lower part along the main meridian curve. The refractive power K.sub.E at the near eyepoint, refractive power K.sub.A at the defined center A, and refractive power K.sub.B at the near center B satisfy the condition: