Thomson-csf

Thomson-brandt

Thompson-csf

Cdf Chimie, Societe Chimique Des Charbonnages

Jean-Claude Dubois

Annie Zann

Maryse Gazard

Dominique Broussoux

Pierre Le Barny

Armand Eranian

Alain Beguin

Francoise Barre

Jean P Billard

Olivier Sagnes

Francois Henry

Jean-Claude Lehureau

Claude Bricot

Michel Hareng

Philippe Robin

Henriette Magna

Jean-Pierre Ganne

Francois LeCarvennec

Florence Epron

Huu Tinh Nguyen

Gerard Seytre

Serge Le Berre

Jean-Noel Perbet

Hugues Facoetti

John Magarshack

Gilles Ravaux

Francoise Soyer

Michele Labeyrie

Andre Couttet

Evelyne Datamanti

Pierre LeBarny

Sophie Esselin

Jean-Pierre Paschal

Philippe Gaucher

Sophie Muller

Marc Lagarde

Evelyne Chastaing

Tinh H Nguyen

Paul Paimblant

Tran Van Hoang

Jean-Yves Decroix

Valerie Massardier

Pierre Charlot

Alain Guyot

Alain Douillard

Marcel Camps

Jean-Pierre Montheard

Thierry Pascal

Christian Riguidel

Alain Leborgne

Nicole Lacoudre

Claudine Noel

Nicolas Spassky

An electronic card having an electronic control circuit, an elector-optical element configured as a normal operation indicator, and a power supply source. Electrical tracks connect the electronic control circuit with the electro-optical element and the power supply source, and affixing elements attach the electronic card to a substantially planer surface. The electrical tracks having embrittlement grooves which destroy the connections made by the electrical tracks upon removal of the electronic card from the substantially planer surface to which the electronic card is attached. The electronic card is suited for applications in the identification and automatic detection of objects and in particular, stolen vehicles.

Electronic card with indicator of normal operation

A bank or identity type of magnetic card contains ferromagnetic elements that selectively absorb waves at microwave frequencies. The disclosure also relates to a reading device adapted to this card. The device has an active system and a resonant system capable of filtering the microwaves at the resonance frequencies of the ferromagnetic materials of the card to be read. The reading device, equipped with a system to measure the amplitude of the microwaves, can thus recognize the magnetic information elements on the card, through the disturbance or non-disturbance of the microwaves during the insertion of the card into the device. The value of the encoding of the card lies in fact that the information elements are hard to destroy.

Card having a ferromagnetic track and reader therefor

This invention concerns conductive materials based on an encapsulated conductive polymer. Encapsulation in a shell of polymer stabilizes the conductivity of these materials, which can be encapsulated in a shell of film-generating polymer, to give the material formed very good mechanical properties, unlike conductive polymers which existed in the prior art, which, if not encapsulated, form brittle materials that are less stable in time.

Conductive materials based on encapsulated conductive polymers

A material based on a conductive polymer consisting of particles of conductive polymer (P.sub.0), each particle being wrapped in a shell of water-insoluble, cross-linked polymer (P.sub.1).

The invention is a new process to produce polyparaphenylene vinylene or polyparathienylene vinylene polymers using a sulfonium-based polyelectric precursor. This precursor is treated directly with acid to obtain the polymers required. These polymers have high molecular weights and are particularly advantageous in the plastics transformation field.

Process to produce polyparaphenylene vinylene or polyparathienylene

The invention is a series of amorphous copolymers which, used in association with a small molecule, provide photorefractive materials that can be used in optical signal processing. These copolymers contain an active non-linear optical group and a group which contributes to their photoconductivity. ##STR1## where: X is H, CH.sub.3, Cl or F

Amorphous copolymers for photorefractive compounds used in optical

An identification system is disclosed which includes marks on an object for locating a region of the object which contains an identification in the form of either an etching or a responsive electronic circuit and a detection device for detecting the proximity of the first mark in order to localize the position of the etching or responsive electronic circuit so that the etching or responsive electronic circuit may be read.

Object-marking means, method for making such means and reading device

This invention concerns new molecules with active, non-linear optical properties and which can be thermally reticulated (more precisely, these molecules include terminal functions which can be reticulated, attached to either side of the groups active in non-linear optics, which can be oriented under an electrical field). When reticulated and oriented under an electrical field, these materials are particularly stable and can be employed for industrial applications, using non-linear optics (electrooptical modulators, frequency doublers, etc.).

Thermally reticulated materials for non-linear optical applications

Process for obtaining a structure generating non-linear electrooptical

Disclosed is a process for the synthesizing of polysilsesquioxane, including a first step for the hydrolysis, in the presence of ether, of trichlorosilane with the general formula RSiCl.sub.3 where R represents an organic radical, notably an alkyl, an aryl, a vinyl or an allyl, said process further including the following steps;

Process for the synthesis of polysilsesquioxanes and application of the

The invention is a process to manufacture a controlled-porosity ceramic material by synthesizing an aerogel produced by hypercritical drying of a high-porosity gel. Applications in the submarine acoustic field (active and passive sonars).

Controlled-porosity piezoelectric ceramic

Disclosed is an electrically conductive composite polymer film formed from an organic matrix and conductive charges. The matrix is a polymer obtained from a filmogenic macromolecular latex and the conductive charges consist of a conductive polymer diffused in the matrix. The invention can be applied to microwave absorbent layers.

Conductive composite polymer film and method for its manufacture

In a family of side-chain homopolymers of the polyacrylate type derived from 1-(phenyl)-2-(4-cyanophenyl)-ethane and exhibiting one or a number of mesophases, the polymer in accordance with the invention corresponds to the following general chemicals formula: ##STR1## where x indicates the degree of polymerization and 2.ltoreq.n.ltoreq.15.

Side-chain mesomorphic polymers derived from

The invention relates to a group of organic compounds of the substituted 2-hydroxyfluorene ester type, which has a smectic A mesomorphous phase. The invention also relates to the process for producing molecules of this group. The compound according to the invention is in accordance with the general chemical formula ##STR1## whereby n can be between 1 and 15 and X=Br or CN. The invention applies to the field of liquid crystals and to display means using such crystals.

Liquid crystals having a type A smectic phase

Growing community of inventors

Paris, France

Jean-Claude Dubois