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:
Feb. 19, 2013
Filed:
Jul. 16, 2010
Kazunori Nunome, Chiyoda-ku, JP;
Manabu Matsui, Chiyoda-ku, JP;
Kazushi Tando, Chiyoda-ku, JP;
Teruyuki Shigematsu, Chiyoda-ku, JP;
Tetsuya Motoyoshi, Chiyoda-ku, JP;
Tomokiyo Doi, Chiyoda-ku, JP;
Kazunori Nunome, Chiyoda-ku, JP;
Manabu Matsui, Chiyoda-ku, JP;
Kazushi Tando, Chiyoda-ku, JP;
Teruyuki Shigematsu, Chiyoda-ku, JP;
Tetsuya Motoyoshi, Chiyoda-ku, JP;
Tomokiyo Doi, Chiyoda-ku, JP;
Teijin Chemicals, Ltd., Tokyo, JP;
Abstract
This invention is to provide a polyester carbonate copolymer suitable for an optical lens that has high refractivity and transparency and low birefringence and little optical strain, and optical lenses formed therefrom. This invention is a polyester carbonate copolymer for an optical lens, which comprises 67 to 95 mol % of a unit of the following formula (I) and 33 to 5 mol % of a unit of the following formula (II) and has a specific viscosity of 0.12 to 0.30,