Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality
US5126081A · kind A · utility
13Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1990 |
| Grant date | Jun 30, 1992 |
| Priority date | — |
| Expiry date | Apr 27, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P40/57
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Articles of polycrystalline zinc sulfide and zinc selenide achieve substantially improved optical quality by a treatment of heat and isostatic pressure by means of an inert working fluid. The treated specimens are transparent and have substantial transmission in the infrared and visible range of the spectrum. Additional improvement in the transmission characteristics is achieved by wrapping the specimens in a foil of an inert material prior to treatment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.