Patent · US Expired

Heterocyclically annellated indenochromene derivatives

US6881850B2 · kind B2 · utility

3Cited by

8References

6Claims

0Family size

Assignee

RODENSTOCK GMBH · DE

Inventors

Claudia Mann · Munich, DE
Manfred Melzig · Weßling, DE
Udo Weigand · Munich, DE

Key dates

Filing date	Nov 25, 2003
Grant date	Apr 19, 2005
Priority date	—
Expiry date	Nov 25, 2023

Classification

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

Abstract

The present invention relates to specific photochromic heterocyclically annellated indenochromene derivatives and the use thereof in plastics of all types, particularly for ophthalmic applications. In particular, the present invention relates to indeno[1,2-h]chromene derivatives having the following general formula (I) and indeno[2,1-f]chromene derivatives having the following general formula (II):

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