The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 16, 2007
Filed:
Jul. 09, 2002
John H. Burnett, Washington, DC (US);
Zachary H. Levine, Rockville, MD (US);
Eric L. Shirley, Germantown, MD (US);
John H. Burnett, Washington, DC (US);
Zachary H. Levine, Rockville, MD (US);
Eric L. Shirley, Germantown, MD (US);
The United States of America as represented by the Secretary of Commerce, Washington, DC (US);
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 CaFwith a second crystal of SrFor BaF. The resulting composition is in the form of CaSrFor CaBaF, or a combination of SrFand BaF, in the form of CaSrBaF. 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, CaF, SrF, and BaF.