# US 8,771,558 B2 · Method of manufacturing anti-counterfeit ink and anti-counterfeit tag and method of manufacturing the same

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- Number: US 8,771,558 B2
- Document ID: US8771558B2
- Status: Granted
- Kind: B2
- Application number: 12/963,640
- Filed: 2010-12-09
- Published: 2012-03-15
- Granted: 2014-07-08
- Earliest claimed: 2010-09-14
- Assignees: National Taiwan University of Science and Technology
- Applicants: Borh-Ran Huang; Tzu-Ching Lin; Ying-Kan Yang
- Inventors: Borh-Ran Huang; Tzu-Ching Lin; Ying-Kan Yang
- Web page: https://patentgrep.com/patent/US8771558B2

## CPC

- B41M 3/14: Security printing {(securities B42D25/29)}
- B42D 25/00: Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof (printing processes to produce identification or security features B41M3/14)
- C09D 11/52: Electrically conductive inks
- B42D 2033/20
- B42D 2035/34
- B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P)
- B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

A method of manufacturing an anti-counterfeit ink is provided. A tungsten oxide nanowire is provided. A hydrophilic treatment is performed to the tungsten oxide nanowire to form a tungsten oxide nanowire with hydrophilicity. The tungsten oxide nanowire with hydrophilicity and an ink are mixed to form an anti-counterfeit ink.

## Claims

### Claim 1

A manufacturing method of an anti-counterfeit ink, the method comprising:
providing a tungsten oxide nanowire;
performing a hydrophilic treatment to the tungsten oxide nanowire to form a tungsten oxide nanowire with hydrophilicity, wherein the hydrophilic treatment is a plasma etching process using hydrogen plasma or a chemical etching process; and
mixing the tungsten oxide nanowire with hydrophilicity with an ink to form an anti-counterfeit ink.

### Claim 2 (depends on 1)

The manufacturing method of the anti-counterfeit ink as claimed in claim 1, wherein the tungsten oxide nanowire comprises a tungsten trioxide nanowire.

### Claim 3 (depends on 1)

The manufacturing method of the anti-counterfeit ink as claimed in claim 1, when a voltage is applied to the anti-counterfeit ink, the anti-counterfeit ink changes from a first color to a second color.

### Claim 4 (depends on 1)

The manufacturing method of the anti-counterfeit ink as claimed in claim 1, wherein the ink comprises a conductive filler, a metal oxide, and a conductive polymer.

### Claim 5 (depends on 1)

A manufacturing method of an anti-counterfeit tag, the method comprising:
providing a substrate; and
printing an anti-counterfeit ink as claimed in claim 1 on the substrate to form the anti-counterfeit tag, such that the anti-counterfeit tag changes from a first color to a second color when a voltage is applied to the anti-counterfeit tag.

### Claim 6 (depends on 5)

The manufacturing method of the anti-counterfeit tag as claimed in claim 5, wherein the tungsten oxide nanowire comprises a tungsten trioxide nanowire.

### Claim 7 (depends on 5)

The manufacturing method of the anti-counterfeit tag as claimed in claim 5, wherein the substrate comprises a flexible substrate, a conductive substrate, a non-conductive substrate, and a water-proof substrate.