Patent · US Expired

Photochromic diaryl-3H-naphthopyrane

US5990305A · kind A · utility

4Cited by

8References

20Claims

0Family size

Assignee

Optische Werke G. Rodenstock · DE

Inventors

Herbert Zinner · Pentling, DE
Manfred Melzig · Weßling, DE

Key dates

Filing date	Feb 5, 1998
Grant date	Nov 23, 1999
Priority date	—
Expiry date	Feb 5, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG03C1/73
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Disclosed is a photochromic compound having a diaryl-3H-napthopyran structure, which has at the 8-position a nitrogen atom-linked hetercyclus, in which the heterocylcus can also have a HALS compound as a substituent or the heterocyclus itself can be formed as a HALS compound. Furthermore a photochromic compound is described having a diaryl-3H-naphtopyran structure which has at the 8-position an N-atom linked and an alkyl-bridge linked HALS compound.

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