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:
Aug. 04, 2015
Filed:
Jul. 12, 2011
Rebekah Ann Derryberry, Wilmington, DE (US);
Roger Harquail French, Cleveland Heights, OH (US);
Mark E. Lewittes, Wilmington, DE (US);
Ronald Jack Riegert, Newark, DE (US);
Jose Manuel Rodriguez-parada, Hockessin, DE (US);
Rebekah Ann Derryberry, Wilmington, DE (US);
Roger Harquail French, Cleveland Heights, OH (US);
Mark E. Lewittes, Wilmington, DE (US);
Ronald Jack Riegert, Newark, DE (US);
Jose Manuel Rodriguez-Parada, Hockessin, DE (US);
E I DU PONT DE NEMOURS AND COMPANY, Wilmington, DE (US);
Abstract
An optical element has a plano-plano body formed of a first material having a greater refraction index nand a second material having a lesser refraction index n. Both indices are greater than one. The absolute value of the index contrast, log(n/n), is in the range from about 0.001 to about 0.17, preferably from about 0.01 to about 0.05. The materials have an induced absorbance rate ΔAbs/Dose less than or equal to about 0.4, preferably less than or equal to about 0.2. The materials are arranged such that an interface with at least one cusp is defined therebetween. The cusp has an apex pointed toward the material having the greater index of refraction. The cusp is operative to produce a region of increased light intensity on one surface of the optical element in response to light incident on the other surface of the optical element.