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. 16, 2010
Filed:
May. 08, 2008
Applicants:
Sayuri Kohara, Sagamihara, JP;
Daiju Nakano, Sagamihara, JP;
Fumiaki Yamada, Yokohama, JP;
Inventors:
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
F21V 7/09 (2006.01);
U.S. Cl.
CPC ...
Abstract
A prism sheet changes a direction of light propagation by reflecting light launched with an intensity distribution of a predetermined angle range wherein: a reflective surface for perfect reflection of light includes a higher order surface constructed by at least a small curvature surface and a surface different from the small curvature surface.