Light valve, light valve suspension materials and suspension therefor
US4025163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1975 |
| Grant date | May 24, 1977 |
| Priority date | — |
| Expiry date | Aug 13, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/172
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A light valve including suspending materials which have an ability to prevent or substantially retard agglomeration of the particles in suspension during the application of a voltage to the suspension. The materials comprise aromatic esters which are derivable from aromatic alcohols, such as phenyl acetate, cresyl acetate and structurally similar compounds. Other suspending material such as non-aqueous liquids or solids may also form part of the suspending medium of this invention, used to suspend the particles. The suspension also may include a coating material to coat the particles in suspension and act in combination with the suspending materials to prevent or substantially reduce agglomeration of the particles when a voltage is applied to the suspension.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.