IP Library › Granted Patent US 8,137,770
Granted Patent B2
US 8,137,770 · App. 12/614,014 · Granted Mar 20, 2012

Method of forming and visualizing latent image

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Quick Facts
Patent No.
US 8,137,770
App. No.
12/614,014
Granted
Mar 20, 2012
Kind
B2
Abstract

A method of visualizing a latent image includes: preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles; immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.

Claims (22)

1. An authenticity assessment method comprising:

preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;

immersing the latent image in the dispersion liquid of paramagnetic colloidal particles;

applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles; and

assessing authenticity on the basis of a visualized image.

2. A method of visualizing a latent image comprising:

preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;

immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and

applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.

3. A method of visualizing a latent image comprising;

preparing a latent image composed of a plurality of paramagnetic seeds immobilized on a base in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;

hydrophilizing a surface of the base having the latent image thereon, after preparing the latent image and the dispersion liquid of paramagnetic colloidal particles;

immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and

applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.

4. A method of reproducing recorded information comprising:

preparing an information recording medium having a latent image composed of a plurality of paramagnetic seeds immobilized in the form of an image, and a dispersion liquid of paramagnetic colloidal particles;

immersing the latent image in the dispersion liquid of paramagnetic colloidal particles; and

applying a magnetic field to the latent image and the dispersion liquid of paramagnetic colloidal particles.

5. An article having an authenticity assessment unit comprising:

a closed cell, the interior of which is observable;

a base disposed on a bottom of the cell, the base having a latent image portion on which a plurality of paramagnetic seeds are immobilized in the form of an image; and

a dispersion liquid of paramagnetic colloidal particles, the dispersion liquid being filled in the cell.

Assignments (2)
RELEASE OF SECURITY INTEREST Recorded Nov 29, 2023
From: CRESTLINE DIRECT FINANCE, L.P.
To: EMPIRE TECHNOLOGY DEVELOPMENT LLC
Reel/Frame 065712/0585 →
SECURITY INTEREST Recorded Jan 29, 2019
From: EMPIRE TECHNOLOGY DEVELOPMENT LLC
To: CRESTLINE DIRECT FINANCE, L.P.
Reel/Frame 048373/0217 →