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

Search patents:

Home

LCD

Method-and-apparatus-for-providing-security-features-in-paper

Liquid crystal information storage and retrieval system

In accordance with the illustrated preferred embodiments, the present invention provides an optical,...

Corona charging apparatus

In achieving the above and related objects, the invention provides a corona charging device ...

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 ...

Corona charging apparatus

In achieving the above and related objects, the invention provides a corona charging device ...

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 ...

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. I...

Optical switches using ferroelectric liquid crystals

The invention comprises an optical switch wherein an input optical fiber directs light onto a first ...

Stereoscopic projector

Accordingly, it is an object of the present invention to provide a stereoscopic projector for ...

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 ...

Method and apparatus for providing security features in paper

Details

Inventors: Crane, Jr., Frederick G.;
Assignee: Crane and Company (Dalton, MA)
Primary Examiner: Chin; Peter
Assistant Examiner:
Attorney, Agent or Firm:

A security device is integrally combined with the fibres of the paper in a paper-making process. A carrier web of water-dispersible fibres carrying the security element is brought into contact with the paper stock during the paper-making process. The carrier web becomes rapidly dispersed upon contact with the wet stock leaving the security element firmly attached to the paper fibres in the stock. In one embodiment, the security element comprises a plastic diffraction grating structure. In a further embodiment, the carrier web comprises an open porous structure for enhancing intermixing with the paper stock.

DETAILED DESCRIPTION Security devices are incorporated in the paper during the paper-making process by using a carrier web to support the security device during the paper formation on the paper machine.
Said carrier web is water dispersable so that it will disperse during the paper forming process, its fibres becoming part of the ensuing paper and the security device remaining within the ensuing paper in its desired location.
Another method employs carrier web having an open, porous structure with sufficient wet strength to maintain its integrity during the paper forming process to which the security device has been attached by means of adhesive so that the carrier web will become a part of the ensuing paper and will provide an anchor to secure the device within the paper.
The carrier web may contain a plurality of low temperature heat seal fibres or a heat seal sizing which may be used to attach the device to the carrier web.

Related patents

	Security paper A security paper having optically variable devices is manufactured on a conventional Fourdrenier paper making machine having unique modifications. These modifications ...
	Security paper for currency and banknotes The invention comprises the encoding of printed information onto a strip of clear plastic film which is later incorporated within the paper during the papermaking ...
	Optical sources having a strongly scattering gain medium providing laser-like action OF THE INVENTION In order to describe in detail a number of novel embodiments of this invention, a description is first made of experimental results which clearly ...
	Security threads having at least two security detection features and security papers employing same The present invention therefore provides a security thread, suitable for at least partial incorporation in and/or for mounting on a security document or means of ...
	Reversibly photochromic printing inks OF THE INVENTION In the following description, abbreviations will be used for the sake of shortness. "Photochromic" or "photodye" means a photochromic compound. "P...
	Liquid crystal display device, method for producing the same, and projection-type display apparatus including the liquid crystal display device According to one aspect of the invention, a liquid crystal display device includes a pair of substrates; a liquid crystal layer interposed between the pair of substrates;...
	Electro-optic apparatus, electronic apparatus therewith, and manufacturing method therefor In view of the above-mentioned problems, it is an object of the present invention, in an electro-optical apparatus such as a liquid crystal apparatus having a structure ...
	Tamper-indicating sheet 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 ...
	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 ...

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