Patent · US Expired

System, apparatus, and method for reducing birefringence

US6491391B1 · kind B1 · utility

276Cited by

83References

12Claims

0Family size

Assignee

e-Vision, LLC · US

Inventors

Ronald D. Blum · Roanoke, US
Dwight P. Dustin · Laguna Niguel, US
Youval Katzman · Zichron Ya'akov, IL
Israel Grossinger · Karmei Yosef, IL
Uzi Efron · Herzliya, IL
Dan Katzman · Givat Ela, IL

Key dates

Filing date	Jun 23, 2000
Grant date	Dec 10, 2002
Priority date	—
Expiry date	Jun 23, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07K2319/00
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

An electro-active spectacle lens is disclosed. The disclosed lens includes a first lens optic. The disclosed lens also includes a first electro-active zone positioned in a cooperative relationship with the first lens optic. In certain embodiments, the electro-active lens includes a range finder positioned in a cooperative relationship with the electro-active lens.

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