Patent · US Expired

H-annellated benzo[f]chromenes

US6686468B2 · kind B2 · utility

3Cited by

3References

12Claims

0Family size

Assignee

Optische Werke G. Rodenstock · DE

Inventors

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

Key dates

Filing date	May 10, 2002
Grant date	Feb 3, 2004
Priority date	—
Expiry date	Jun 4, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D311/94
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

The present invention relates to specific photochromic h-annellated benzo[f]chromene derivatives and their use in synthetic resins of all types, especially for ophthalmic applications. In particular, the present invention relates to photochromic compounds derived from benzo[f]chromenes, which in the open form have especially long-wave absorption maxima making it possible to obtain violet to blue tints when used in phototropic glasses.

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