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:
Nov. 17, 2009
Filed:
Apr. 17, 2008
Hiromichi Nagayama, Tokyo, JP;
Yuriko Kaida, Tokyo, JP;
Kara Yoshida, Tokyo, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A liquid crystal compound represented by the formulaCH═CR—COO-(L)-E-E-E-E-Rwherein R: a hydrogen atom or a methyl group; R: a Calkyl group; k: 0 or 1; L: —(CH)O— or —(CH)— (wherein each of p and q which are independent of each other, is an integer of from 2 to 8); E: a 1,4-phenylene group; E, E, E: each independently a 1,4-phenylene group or a trans-1,4-cyclohexylene group and at least one of Eand Eis a trans-1,4-cyclohexylene group, provided that the 1,4-phenylene group and trans-1,4-cyclohexylene group in Eto Emay be such that a hydrogen atom bonded to a carbon atom in each group may be substituted by a fluorine atom, a chlorine atom or a methyl group. To provide a novel liquid crystal compound for preparing an optical element which can exhibit a proper Rd value depending upon usable wavelength and application and which is excellent in durability against a blue laser beam.