Patent · US Active

Photochromic multiple ring-fused naphthopyrans having extreme longwave absorption extending far into the visible wavelength range

US10647852B2 · kind B2 · utility

0Cited by

1References

12Claims

0Family size

Assignee

RODENSTOCK GMBH · DE

Inventors

Udo Weigand · Munich, DE
Herbert Zinner · Pentling, DE

Key dates

Filing date	May 23, 2017
Grant date	May 12, 2020
Priority date	—
Expiry date	May 23, 2037

Classification

Technology area (CPC G)Physics
CPC primaryG02B5/23
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to photochromic polyfused naphthopyrans having very long-wave absorption of the closed form extending well into the visible wavelength range, and to the use thereof in all kinds of plastics, especially for ophthalmic purposes, preferably in driving glasses.

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