Societe Europeenne De Propulsion

Snecma Propulsion Solide

Centre International De Recherches Dermatologiques

Societe Nationale D'etude Et De Construction De Moteurs D'aviation

Dermatologiques (cird)

Centre International De Recherches Dermatologigues Galderma (cird

Herakles

Bruno C Bernard

Braham Shroot

Jacques Thebault

Sébastien Bertrand

Stéphane Goujard

Christian Robin-Brosse

Jacques Rey

Aline Balhadere

Daniel Asselineau

Yves-Michel Darmon

Michel Laxague

Stephane R Goujard

Jean-Luc Domblides

Jean-Claude Cavalier

Jean-Luc Leluan

Christian Bertone

Jean-Philippe Richard

Yves M Darmon

Christian B Brosse

Isabelle Mouricou

Jacques A Moreau

Yves Darmon

Marie-Cecile Lenoir

Maris-Cecile Lenoir

A method of densifying a porous substrate with pyrolytic carbon includes loading the substrate into an oven, admitting a reaction gas mixture to the oven, extracting an effluent gas from the oven, and recycling components of the effluent gas into the reaction gas mixture. The reaction gas mixture contains a pyrolytic carbon precursor gas together with a vector gas. The effluent gas contains residual components of the reaction gas mixture together with reaction products, including hydrogen. The recycling is performed after eliminating heavy hydrocarbons contained in the effluent gas.

Method for chemical infiltration in the gas phase for the densification of porous substrates with pyrolytic carbon

A method of densifying porous substrates by chemical vapor infiltration comprises loading porous substrates for densification in a loading zone of an enclosure (), heating the internal volume of the enclosure, and introducing a reagent gas into the enclosure though an inlet situated at one end of the enclosure. Before coming into contact with substrates () situated in the loading zone, the reagent gas admitted into the enclosure is preheated, at least in part, by passing along a duct () connected to the gas inlet and extending through the loading zone, the duct being raised to the temperature inside the enclosure, and the preheated reagent gas is distributed in the loading zone through one or more openings () formed in the side wall () of the duct, along the duct.

Method and installation for the densification of substrates by means of chemical vapor infiltration

Annular substrates () are stacked in an enclosure where they define an inside volume () and an outer volume () outside the stack. A gas containing at least one precursor of a matrix material to be deposited within the pores of the substrates is channeled inside the enclosure to a first one () of the two volumes, and a residual gas is extracted from the enclosure from the other one () of the volumes. One or more leakage passages () allow the volumes to communicate with each other, other than through the substrates. The total section of the leakage passages has a value lying between a minimum value for ensuring that a maximum gas pressure in the first volume is not exceeded until the end of densification, and a maximum value such that a pressure difference is indeed established between the two volumes from the beginning of densification.

Chemical vapor infiltration method for densifying porous substrates having a central passage

Method for delivering a molten silicon composition into porous substrates

Prior to applying an impregnation composition constituted by a solution of at least one phosphate, a part made of composite material is treated in depth by means of an aqueous solution that penetrates into the open internal pores of the composite material, and is then dried. The aqueous solution contains an additive which, after drying, imparts to the composite material, increased wettability by the impregnation composition. The additive contained in the aqueous solution is preferably constituted by at least one wetting agent that is soluble in water and non-ionic, such as an oxyethylenated fatty acid, an oxyethylenated fatty alcohol, an oxyethylenated alkyl-phenol or an ester of a high polyol.

Method of protecting a part made of a carbon-containing composite

The invention concerns a skin substitute composed of a dermis equivalent covered with an epidermis equivalent. The dermis equivalent is a film formed from a type I collagen gel containing fibroblasts. The epidermis equivalent incorporates a basal membrane equivalent, basal layer cells, in a palisade arrangement attached to the membrane equivalent by hemidesmosomes, cells of the suprabasal layers, granular cells, and flat, keratinized cells arranged near the free surface.

Skin substitute

The invention concerns a process for obtaining a skin substitute and the skin substitute itself. According to this process, a dermis substitute is prepared by mixing contractile cells, a nutritive medium, and collagen, in order to form a contracting gel; this dermis substitute is used as a substrate for an epidermis substitute obtained by culturing, using keratinocytes from an animal or human skin sample. According to the invention, the substrate is implanted with at least one section of a hair follicle retaining at least partially its cellular sheath, this section being implanted perpendicularly to the free surface of the substrate.

Process for creating a skin substitute and the resulting skin substitute

A method of densifying a porous substrate by means of a matrix containing carbon, for obtaining an article made of a composite material, the method comprising the following steps:

Method of densifying a porous substrate by means of a matrix containing

A fiber preform is initially consolidated by being impregnated with a thermosetting impregnation composition that contains a ceramic precursor, and by heat treatment at the end of which the precursor has been transformed into ceramic, without passing through a meltable phase. The consolidated preform is then densified. The impregnation composition is constituted by a mixture of a thermosetting monomer and a ceramic precursor polymer, and the monomer is cross-linked during the heat treatment so as to achieve 'in situ' cross-linking of the polymer mixture prior to transforming the precursor into ceramic.

Method of manufacturing parts made of ceramic matric composite material

The process is particularly well suited to the manufacture of composite materials, where a fibrous reinforcement texture is to be impregnated by a densifying matrix, and comprises the steps of:

Process for uniformly integrating a solid charge within a porous

A protein characterized by the fact that it is a non-keratinic protein present on the apicolateral surface and absent on the basal surface of basal epidermal cells, in particular in man, that it is present in a nonpolarized manner in basocellular and spinocellular carcinomas and absent in melanoma and naevus cells; antibodies directed against said protein, their preparation and their use as reagents; cellular stocks secreting such antibodies, and their preparation.

Surface protein of basal epidermal cells, antibodies capable of

A protein characterized by the fact that it is a nonkeratinic protein present in the cytoplasm of suprabasal epidermal cells, in particular in man, and absent in basocellular carcinoma, melanoma and naevus cells; antibodies directed against said protein, their preparation and their application as reagents; cellular stocks secreting such antibodies, and their preparation.

Growing community of inventors

Eusines, France

Bruno C Bernard