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:
Jan. 04, 1977
Filed:
May. 15, 1975
Eisaku Nakatani, Hiratsuka, JA;
Kansai Paint Company, Ltd., Amagasaki, JA;
Abstract
When laser rays are radiated on metallic compounds sucn as oxides, hydroxides, sulfides, carbonates, chromates and titanates, colors of these metallic compounds can be changed at high speeds. By application of this discoloration technique, it is made possible to cause discoloration selectively even at very minute areas of molded articles of these metallic compounds. Therefore, this technique can be applied advantageously and effectivey to recording, image reproduction and formation of electric circuits. If these metallic compounds especially oxides, are made semiconductors prior to irradiation of laser rays, the discoloration effects can be greatly enhanced. In conducting this method, laser rays having a wavelength from the visible to infrared region can be effectively employed.