Northrop Grumman Systems Corporation

Albert M Stewart

John F Jackovitz

Narsingh Bahadur Singh

William D Partlow

Steven Strauch

David W Coffey

James D Smith

Robert Mazelsky

Robert Mazelski

Crystals formed of a solid-solution of NiSiF.sub.6 6H.sub.2 O provide very good materials for filtering ultraviolet light and will not deteriorate in temperatures as high as 115.degree. C. They are particularly useful in sensing devices which seek to identify the presence of ultraviolet light in the UV missile warning band.

Crystals for ultraviolet light filters

Crystals formed of a solid-solution of K.sub.2 Ni(SO.sub.4).sub.2 6H.sub.2 O provide very good materials for filtering ultraviolet light and will not deteriorate in temperatures as high as 110.degree. C. They are particularly useful in sensing devices which seek to identify the presence of ultraviolet light in the UV missile warning band.

Crystals formed of a solid-solution of Ni(BF.sub.4).sub.2 6H.sub.2 O provide very good materials for filtering ultraviolet light and will not deteriorate in temperatures as high as 110.degree. C. They are particularly useful in sensing devices which seek to identify the presence of ultraviolet light in the UV missile warning band.

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Pittsburgh, PA, United States of America

Albert M Stewart