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US 6,472,057 B2Granted
Low stress, water-clear zinc sulfide
AssigneeMorton International, Inc.
InventorJitendra S. Goela
Life of this patent
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Abstract
The machinability of water-clear zinc sulfide articles produced by chemical vapor deposition and high temperature, high isostatic pressure (HIP) treatment is enhanced by extending the time over which the article is cooled following the HIP treatment. The resulting low stress, water-clear zinc sulfide articles can be more accurately finished/machined to precise shapes, such as are required in optical applications, than was previously possible.
Claims8
A zinc sulfide article having at least one dimension in excess of ten inches and free of stress birefringence values exceeding 40 nm/cm.
Dependencies are inferred from the claim text.