Polycrystalline zinc sulfide and zinc selenide articles having improved optical quality
US4944900A · kind A · utility
21Cited by
8References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1984 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Jun 14, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/547
- 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.