Patent · US Active

Photochromic annelated naphthopyrane systems with special substituents, for attaining rapid lightening speeds

US11965102B2 · kind B2 · utility

0Cited by

2References

5Claims

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Assignee

RODENSTOCK GMBH · DE

Inventors

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

Key dates

Filing date	Jun 5, 2019
Grant date	Apr 23, 2024
Priority date	—
Expiry date	Apr 10, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG02C7/102
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The present invention relates to new photochromic, fused naphthopyran systems having specific substituents R1, which can be used to attain very rapid lightening speeds, without detriment to the depth of darkening after excitation, and also to the use thereof in plastics of all kinds.

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