Photochromic light valve
US4043637A · kind A · utility
88Cited by
5References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 6, 1975 |
| Grant date | Aug 23, 1977 |
| Priority date | — |
| Expiry date | Oct 6, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens having an optical density which is variable under differing light conditions can be produced by imbibing a synthetic polymer lens such as a polycarbonate or diethylene diglycol bis allyl carbonate polymer with a solution of a metal dithizonate. A polarizing sheet can be laminated thereto or alternatively, a passive dye can be utilized on the inner surface of the lens to provide non-variable reduced optical density in the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.