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:
Sep. 15, 2026
Filed:
Oct. 23, 2023
Coopervision International Limited, Fareham, GB;
Roger Brian Minchin Clarke, Cambridge, GB;
Robert Oag, Southampton, GB;
Robert Chisholm, Amesbury, GB;
Mark Chalmers, Bournemouth, GB;
COOPERVISION INTERNATIONAL LIMITED, Fareham, GB;
Abstract
An electrically-switchable liquid crystal cell () is provided, along with a lens () comprising the cell, and methods of manufacturing the cell. The liquid crystal cell () includes a diffractive optical element () and liquid crystal material () switchable between an unmatched state and a matched state. In the unmatched state, the effective refractive index of the liquid crystal material () is different from the refractive index of the base material () of the diffractive optical element (). In the matched state, the effective refractive index of the liquid crystal material () matches the refractive index of the base material (). In the matched state the diffractive optical element does not contribute a focal power for the lens. The diffractive optical element () has a number of peaks () and troughs () having rounded corners.