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:
Dec. 15, 2009
Filed:
Apr. 01, 2005
Pil-soo Ahn, Suwon-si, KR;
Serafimovi Pavel, Yongin-si, KR;
Byoung-ho Cheong, Goyang-si, KR;
Yong-kweun Mun, Yongin-si, KR;
Jin-ho Lee, Suwon-si, KR;
Pil-Soo Ahn, Suwon-si, KR;
Serafimovi Pavel, Yongin-si, KR;
Byoung-Ho Cheong, Goyang-si, KR;
Yong-Kweun Mun, Yongin-si, KR;
Jin-Ho Lee, Suwon-si, KR;
Abstract
A diffraction grating including a substrate, and a grating member formed on the substrate, the grating member having a stepped structure including steps, the number of which corresponds to an odd number greater than or equal to three to provide an odd phase structure. The heights of the steps of the grating member are determined such that the light beams diffracted by their corresponding steps substantially have a phase difference of π with reference to a diffracted light beam of a reference wavelength.