Neutral-colored gray photochromic plastic object

US6373615B1 · kind B1 · utility

Assignee

• Optische Werke G. Rodenstock · DE

Inventors

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

Key dates

• Filing date: Jul 11, 2000
• Grant date: Apr 16, 2002
• Expiry date: Jul 11, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/23
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A neutral-colored gray photochromic plastic article which remains almost completely color-neutral or gray both during darkening as well as during bleaching. The plastic article according to the invention may be employed as a neutral-color gray photochromic ophthalmic lens.