Home | Links | Contact Us | More About Intellectual Property | Bookmark

Search patents:

Home

LCD

Tamper-indicating-sheet

Autostereoscopic display having a high resolution 2D mode

It is thus possible to provide an autostereoscopic display having enhanced resolution in a 2D mode. ...

N x N switch array with reduced components

Switch arrays are provided with controllable polarization modifiers and polarization-dependent ...

Environmental magnetism compensating device and cathode-ray tube display device

According to a first aspect of the present invention, an environmental magnetism compensating ...

Laser scanner driving apparatus

A laser scanner driving apparatus according to the present invention, wherein a rectilinear ...

Polymer dispersed liquid crystal information recording medium with information recording layer comprising acrylic or methacrylic resin having molecular weight of 25,000 to 100,000 and information recording and reproducing method

What we claim is: 1. An information recording medium, comprising an information recording layer of ...

Low driving voltage polymer dispersed liquid crystal display device with conductive nanoparticles

OF THE PREFERRED EMBODIMENT While the specification concludes with claims defining the features of ...

Multi-spot modulator using a laser diode

Referring now to FIG. 1, the preferred embodiment consists of a laser diode 1, a focussing lens 2 ...

Optical systems and methods based upon temporal stretching, modulation and recompression of ultrashort pulses

OF THE INVENTION In accordance with the present invention pulse shaping of picosecond to ...

Optical multiplexer

The object of the present invention is to provide a communications system capable of operation at ...

Broad-band ultraviolet lens systems well-corrected for chromatic aberration

We claim: 1. A lens system comprising a first rigid lens element, a second rigid lens element and a ...

Tamper-indicating sheet

Details

Inventors: McCorkle, James L.;
Assignee: Ludlow Corporation (Needham Heights, MA)
Primary Examiner: Kittle; John E.
Assistant Examiner: Dees; Jose G.
Attorney, Agent or Firm: Conlin; David G.

A novel lottery ticket comprising a blush-type coating which coating is characterized by susceptibility to a change in appearance when exposed to either (a) any of a wide spectrum of organic solvents or (b) an elevated temperature. Such susceptibility reveals that solvent or thermal techniques have been used in tampering with the ticket or a pouch package in which the ticket is held. Such tampering is often the result of an illicit attempt to obtain information about the indicia printed on the ticket.

DETAILED DESCRIPTION What is claimed is: 1.
A blush coating composition comprising a mass of light-scattering, primary resin particles which are adapted to coalesce to a more compact coating (a) on application of heat thereto, or (b) on exposure to aliphatic or aromatic solvent, said mass of particles being in intimate contact with a minor amount of a binder composition which, on exposure to any of a wide spectrum of aromatic or aliphatic solvents, will form a means to substantially impair the light-scattering character of said mass of particles and transform said mass of particles into a more compact, normally translucent, coating.
2.
A blush coating composition as defined in claim 1, wherein said binder comprises solvent-leachable plasticizer components which form means to accelerate coalescence of said primary resin particles.
3.
A blush coating composition as defined in claim 1 wherein said binder is thermally-activatable to allow coalescence of said primary resin particles at a temperature which is in the range of about 140.
degree.
-220.
degree.
F.
4.
A blush coating composition as defined in claim 1 wherein said binder is present in the coating in a volume of 10-25% based on total volume of solids in said coating.
5.
The blush coating composition of claim 1, wherein the primary resin particles coalesce on exposure to aromatic solvents, and the binder composition forms means to substantially impair the light-scattering character of the particles upon exposure to aliphatic solvents.
6.
The blush coating composition of claim 1, wherein the primary resin particles coalesce on exposure to aliphatic solvents, and the binder composition forms means to substantially impair the light-scattering character of the particles upon exposure to aromatic solvents.
7.
The blush coating composition of claim 1, wherein the binder is thermally activatable to allow coalescence of the primary resin particles at a temperature which is below the coalescence temperature of the primary resin particles when thermally activated without the binder

Related patents

	Optically variable and machine-readable device for use on security documents The present invention meets that need by providing an optically variable device for use on security documents which is inexpensive to produce and deters unauthorized ...
	Field emission electron gun It is therefore an object of the invention to provide a field emission electron gun capable of generating a stable electron beam for a long period of time. A further ...
	Liquid crystal information storage and retrieval system In accordance with the illustrated preferred embodiments, the present invention provides an optical, erasable, liquid crystal information storage and retrieval system. T...
	Corona charging apparatus In achieving the above and related objects, the invention provides a corona charging device comprising a support structure defining a slot in which a sheathed elongate ...
	Substituted anthracene-type isotropic dyes for liquid crystal display devices The isotropic dyes of this invention have the general formula: ##STR1## wherein W is selected from the group consisting of ##STR2## wherein: R is independently selected ...
	Corona charging apparatus In achieving the above and related objects, the invention provides a corona charging device comprising an elongate conductor with a dielectric sheath, and an overlying ...
	Electron beam addressed liquid crystal light valve OF PREFERRED EMBODIMENTS Referring to FIG. 1, a modified form of an LCLV is shown which provides a high resolution display of an electron beam scan pattern. A CRT is ...
	Information writing method for an optical disc memory system utilizing a smectic chiral liquid crystal It is therefore an object of the invention to provide an optical disc memory with liquid crystal. It is another object of the invention to provide an erasable and ...
	Optical switches using ferroelectric liquid crystals The invention comprises an optical switch wherein an input optical fiber directs light onto a first polarization means that polarizes the incoming light and directs it ...
	Stereoscopic projector Accordingly, it is an object of the present invention to provide a stereoscopic projector for overcoming such problems encountered in the conventional projectors. A...

0.004
Archive: All patents - Links Copyright (c)2006 Eipa-patents.org - All rights reserved