Patent · US Expired

Photochromic heterocyclically anellated indenochromene compounds

US6660727B1 · kind B1 · utility

15Cited by

8References

7Claims

0Family size

Assignee

RODENSTOCK GMBH · DE

Inventors

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

Key dates

Filing date	Jul 10, 2001
Grant date	Dec 9, 2003
Priority date	—
Expiry date	Jul 10, 2021

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[2,1-f]chromene derivatives having the following general formula (I) and indeno[1,2-h]chromene derivatives having the following general formula (II):

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