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:
Mar. 31, 2009
Filed:
Oct. 21, 2003
Takehiro Kaneko, Souwa-machi, JP;
Takehiro Kaneko, Souwa-machi, JP;
Sunarrow Ltd, Tokyo, JP;
Abstract
As a marking laser beam, a laser beam of wavelength 532 nm obtained by extracting by extracting second higher harmonic of the Nd:YAG laser or a laser beam of wavelength 355 nm obtained by extracting third higher harmonic of the Nd:YAG laser is used on a metal film formed on a plastic key top of a mobile telephone or the like, so that the metal film portion subjected to the beam is completely removed or only the surface portion of the metal film subjected to the beam is removed, thereby forming a planar set of very small concave points. Thus, it is possible to obtain a key unit having a metal film on which a character or symbol is directly marked.