Compositions – Light transmission modifying compositions – Inorganic crystalline solid
Reexamination Certificate
2007-01-16
2007-01-16
Tucker, Philip C. (Department: 1712)
Compositions
Light transmission modifying compositions
Inorganic crystalline solid
C252S585000, C252S588000, C423S464000, C359S321000, C359S885000
Reexamination Certificate
active
10190625
ABSTRACT:
A composition formed from Group II fluorides in which the composition has little or no intrinsic birefringence at a selected wavelength. The composition is a mixed solid solution of CaF2with a second crystal of SrF2or BaF2. The resulting composition is in the form of Ca1−xSrxF2or Ca1−xBaxF2, or a combination of SrF2and BaF2, in the form of Ca1−x−ySrxBayF2. The specific form of the composition that effectively nulls out the intrinsic birefringence at a selected wavelength within the UV range is determined in one preferred method from the magnitudes of the intrinsic birefringences of the components, CaF2, SrF2, and BaF2.
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Burnett John H.
Levine Zachary H.
Shirley Eric L.
Hunt, Jr. Ross F.
Stites & Harbison PLLC
The United States of America as represented by the Secretary of
Tucker Philip C.
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