Patent · US Active

Photochromic materials and photochromic compositions and articles including the same

US7907346B2 · kind B2 · utility

10Cited by

30References

22Claims

0Family size

Assignee

Transitions Optical, Ltd. · US

Inventors

Shanti Swarup · Allison Park, US
Carol L. Knox · Monroeville, US
Feng Wang · Export, US

Key dates

Filing date	Mar 16, 2007
Grant date	Mar 15, 2011
Priority date	—
Expiry date	Jan 12, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31794
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Photochromic materials and photochromic compositions and articles including the photochromic materials are disclosed. The photochromic materials may be the reaction product of a hyperbranched polyester polyol having, on average, at least two reactive hydroxyl groups, and at least one photochromic indeno-fused naphthopyran.

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