Monohydrogentartrate crystalline structure having nonlinear quadratic effects
US5374734A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 23, 1993 |
| Grant date | Dec 20, 1994 |
| Priority date | — |
| Expiry date | Apr 23, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC30B29/56
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The present invention relates to new left-handed or right-handed monohydrogentartrate crystalline structures having nonlinear quadratic effects and a wide transparency range extending from the visible to the near infrared, consisting of optionally substituted 2-amino-5-nitropyridinium cations in combination with a polyanionic organic matrix formed of left-handed or right-handed monohydrogentartrate anions. It also relates to a process for the preparation of these crystalline structures consisting in mixing one mole of cation base with at least two moles of left-handed and/or right-handed tartaric acid. It finally relates to a device having an electrooptical effect containing said crystalline structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.