Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Goro Terumichi0
Date of Patent
October 29, 2019
0Patent Application Number
155648940
Date Filed
April 8, 2016
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A sharpener comprises a cylindrical inner louver portion and a cylindrical outer louver portion each disposed concentrically about an axis that extends forward from a center of a light-emitting surface. Respective back ends of the inner louver portion and the outer louver portion are disposed nearer to the light-emitting surface, and respective front ends and are disposed farther from the light-emitting surface, and the front end of the inner louver portion is disposed nearer to the light-emitting surface than the front end of the outer louver portion is.
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