Patent · US Expired

Double progressive spectacle lens

US7210779B2 · kind B2 · utility

6Cited by

4References

9Claims

0Family size

Assignee

RODENSTOCK GMBH · DE

Inventors

Gregor Esser · Munich, DE
Walter Haimerl · Munich, DE
Edda Wehner · Grafing, DE
Andrea Welk · Munich, DE
Helmut Altheimer · Munich, DE
Martin L. Zimmerman · Chicago, US

Key dates

Filing date	May 13, 2005
Grant date	May 1, 2007
Priority date	—
Expiry date	May 13, 2025

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/061
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A double-progressive spectacle lens in which the progressive action is distributed over the front and rear surfaces of the double-progressive spectacle lenses and described by the quotient QQ=Addvfl/AddGesamtwhere Addvfl represents the increase in the surface dioptric power along the principal line on the front surface between the distance area and the near area, and ADDGesamt represents the increase in the total dioptric power along the principal line between the distance area and the near area, and the fraction Q increases with growing distance area effect F:

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.