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:
Aug. 04, 2026
Filed:
May. 26, 2021
E Ink Corporation, Billerica, MA (US);
Graham Triggs-Ramm, Aberdeenshire, GB;
Peiman Hosseini, Greater London, GB;
E Ink Corporation, Billerica, MA (US);
Abstract
Methods of applying a pattern and security devices are disclosed. In one arrangement, a receiving member () having a layered structure () is provided. The layered structure () comprises a layer of phase change material (PCM,). The phase change material (PCM,) is thermally switchable between a plurality of stable states having different refractive indices relative to each other. An embossing member () is stamped into the receiving member (). The embossing member () heats a selected portion of the layer CA of phase change material (PCM,) via contact with the receiving member () during the stamping. The heating thermally switches N phase change material (PCM,) in the selected portion and thereby applies a pattern of different refractive indices to the layer of phase change material (PCM,).