Reversible chiral optical data storage using majority rule of polymer conformation
US5480749A · kind A · utility
Inventor
Key dates
| Filing date | Sep 27, 1994 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | Sep 27, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
This invention provides a photoswitchable compound comprising interconvertible mirror image units or interconvertible chiral diastereomeric units connected as pendant groups to a stiff polymer having interconvertible left- and right-handed helical portions of its backbone. Further provided by this invention is a photoswitchable compound formed by the method comprising combining an amount of the compound capable of optical activity and capable of changing its optical activity with an amount of a stiff polymer comprised of interconvertible left- and right-handed helical portions. Additionally, this invention provides a method for reversibly storing optical data comprising providing a material comprised of a mixture of a stiff polymer having interconvertible left- and right-handed helical portions and connected units, said units being capable of optical activity and capable of changing its optical activity and irradiating said material with light capable of changing the optical activity of said material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.