Patent · US Expired

Photochromic synthetic resin object with permanently increased contrast

US6853471B2 · kind B2 · utility

3Cited by

2References

6Claims

0Family size

Assignee

RODENSTOCK GMBH · DE

Inventors

Hans-Peter Sommer · Munich, DE
Michael Voegt · Gilching, DE
Gerd-Peter Scherg · Baldham, DE
Manfred Melzig · Weßling, DE

Key dates

Filing date	Jan 30, 2002
Grant date	Feb 8, 2005
Priority date	—
Expiry date	Jul 18, 2022

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/104
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A photochromic synthetic resin (i.e., plastic) object characterized by a permanently increased contrast relative to the contrast of prior art photochromic synthetic resin objects, such that the photochromic synthetic resin object according to the invention exhibits improved contrast in the stationary states and in every intervening phase, including both darkening and lightening. The photochromic synthetic resin objects of the invention are particularly useful as lenses for eyeglasses, especially for sports glasses.

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