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:
Nov. 07, 2023
Filed:
Jun. 19, 2018
Sumitomo Metal Mining Co., Ltd., Tokyo, JP;
SUMITOMO METAL MINING CO., LTD., Tokyo, JP;
Abstract
There is provided an anti-counterfeit ink composition, an anti-counterfeit ink, and an anti-counterfeit printed matter that transmits a visible light region, having absorption in an infrared region, and capable of judging authenticity of a printed matter, and containing composite tungsten oxide fine particles, the composite tungsten oxide fine particles having a hexagonal crystal structure, having a lattice constant such that a-axis is 7.3850 Å or more and 7.4186 Å or less, and c-axis is 7.5600 Å or more and 7.6240 Å or less, and having a particle size of the near-infrared absorbing material fine particles is 100 nm or less, and a method for producing the anti-counterfeit ink composition, the anti-counterfeit ink, the anti-counterfeit printed matter, and the anti-counterfeit ink composition.