baber/WOPTO huggingface dataset:
Patent FR-2430680-A1 (FR)
Title: AC or DC fault current detector - operates by sensing inductance change in transformer with toroidal core
Inventor: LEGRAND MICHEL
IPC: G01R19/20
Filed: 1978-07-05
Abstract: The circuit detects power line fault currents to ground. The currents may be AC or DC, the detector providing general protection against such faults. Detection is based on the change in inductance of a differential transformer secondary winding as a function of the leakage current. The transformer (To) is toroidal with the protected lines (5) acting as the primary winding. The secondary winding (4) is part of a stable Wien bridge oscillator (OS) whose output frequency varies with fault current and provides cut-out (R) control via a pass-band filter (F), an operational amplifier (A), a detector (DE) and a bi-stable control circuit (B).
Patent FR-2401959-A1 (FR)
Title: Nouveaux composes azoiques utilisables comme colorants de dispersion et leur preparation
Inventor: KOERTE KLAUS
IPC: C09B29/095
Filed: 1978-08-31
Abstract: L'invention a pour objet des composés azoïques et leur préparation. Les composés de l'invention répondent à la formule :
Patent FR-2391724-A1 (FR)
Title: Application pharmacologique des triphenylethylenes substitues
Inventor: KREIGHBAUM WILLIAM E
IPC: C07C215/74
Filed: 1978-08-31
Abstract: La présente invention a pour objet l'application pharmacologique des composés de formule :
Patent FR-2401964-A1 (FR)
Title: Prepn. of water-soluble binders for paints - by mixing prods. polymerised to varying extent before neutralising (OE 15.10.78)
IPC: C09D201/00
Filed: 1978-08-31
Abstract: Water-soluble paint binders are made by mixing at least two viscosity stages of a polycondens., polymerisation or polyaddn. cpd. in ratio 2-8 to 8:2 (4:6 to 6:4), the limiting viscosity valves of the two stages being in ratio 1:1.2-3 (1:1.4-2) and the higher viscosity being near the gel point for the cpd. concerned. The mixt. is then converted into water-soluble form by partial or complete neutralisation of ionisable gps. The special mol. wt. distribution, compared with that of the individual components or a single cpd. with the same viscosity, gives improved properties, esp. pigment wetting, viscosity stability, drying and crosslinking properties and flow of the paints produced.
Patent FR-2406186-A1 (FR)
Title: Dispositif pour instrument de determination optique, et de preference visuelle, d'un plan defini
IPC: G01B11/24
Filed: 1978-10-11
Abstract: a. Dispositif pour instrument de détermination optique d'un plan défini, par observation des figures de moiré formées par des écrans à lignes parallèles opaques. b. Dispositif caractérisé en ce qu'il comprend un miroir incliné permettant d'éclairer l'appareil, la nuit, à partir d'une lampe d'éclairage général ou d'un dispositif d'éclairage particulier associé à l'appareil. c. Le dispositif selon l'invention s'utilise sur des appareils de chantiers permettant de définir un plan horizontal à niveler.
Patent FR-2409499-A1 (FR)
Title: Instrument pour mesurer la visibilite
Inventor: LOFGREN FOLKE
IPC: G01N21/59
Filed: 1978-10-20
Abstract: CETTE INSTALLATION POUR MESURER LA VISIBILITE SUR AU MOINS UNE BASE DE MESURE COMPREND UNE UNITE CENTRALE, MUNIE D'UN EMETTEUR DE SIGNAUX LUMINEUX, ET AU MOINS UNE OPTIQUE RECEPTRICE PAR BASE DE MESURE. LA LIAISON ENTRE L'EMETTEUR ET LE OU LES RECEPTEURS SE FAIT PAR CONDUCTEUR LUMINEUX6 POUR EVITER L'AMORTISSEMENT DES SIGNAUX PAR D'EVENTUELLES SOUILLURES DES ORGANES OPTIQUES OU PAR DES INTERFERENCES ATMOSPHERIQUES, LE TRAITEMENT DES SIGNAUX LUMINEUX RENVOYES PAR LES RECEPTEURS A TRAVERS CES CONDUCTEURS S'EFFECTUANT DANS LADITE UNITE CENTRALE. IL PEUT ETRE PREVU UN CONDUCTEUR SUPPLEMENTAIRE POUR UN SIGNAL D'ETALONNAGE ET UNE BOUCLE FORMEE DE CONDUCTEURS DE LUMIERE POUR ASSURER LA COMPENSATION DE VARIATIONS DES PROPRIETES DE TRANSMISSION DES CONDUCTEURS.
Patent FR-2410193-A1 (FR)
Title: Joint de pompe a eau et procede pour assurer l'etancheite entre un arbre et un alesage de carter de pompe
IPC: F16J15/32
Filed: 1978-11-23
Abstract: L'INVENTION CONCERNE L'ETANCHEITE A ASSURER ENTRE UN ARBRE ET UN ALESAGE DE CARTER DE POMPE DESTINE A FAIRE CIRCULER UN FLUIDE CONTENANT DES COMPOSES RISQUANT DE PRECIPITER EN DES PARTICULES POUVANT USER L'ARBRE ET LE JOINT. LE JOINT COMPORTE UN ELEMENT D'ETANCHEITE PRIMAIRE ET UN ELEMENT D'ETANCHEITE AUXILIAIRE, SOLIDAIRE DU PREMIER ET PRESENTANT UNE GRANDE LARGEUR DE CONTACT AVEC L'ARBRE, AXIALEMENT A L'INTERIEUR DE L'ELEMENT PRIMAIRE, POUR PROVOQUER LA PRECIPITATION DES PARTICULES LOIN DE L'ELEMENT PRIMAIRE ET SUR UNE PLUS GRANDE SURFACE. LE JOINT COMPORTE EGALEMENT UN ELEMENT POUR EMPECHER CES PARTICULES D'ATTEINDRE LA LEVRE DE CONTACT ELEMENT PRIMAIREARBRE. APPLICATION: ETANCHEITE D'UNE POMPE A EAU POUR AUTOMOBILES.
Patent FR-2411483-A1 (FR)
Title: Oxide cathode with powder metallurgical nickel support - contg. reducing agent in inlets on surface is resistant to poisoning (BE 5.6.79)
IPC: H01J1/26
Filed: 1978-12-06
Abstract: Oxide cathode consists of a powder-metallurgical Ni support contg. a heating element and a reducing agent (I) for the emitting coating, which contains alkaline earth metal (s) and oxygen. The novel feature is that (I) is not homogeneously distributed in the Ni and islets with a high (I) concn. form on the surface of the support. Cathodes are used in electric discharge tubes (e.g. electron tubes, picture tubes. TV camera tubes, transmission tubes, klystrons, magnetrons etc). They are much less sensitive to poisoning than usual and give a good emission quickly.
Patent FR-2446158-A1 (FR)
Title: Railway sleeper type hard wooden beam end working - involves driving in metal ring between cuts, to prevent longitudinal cracks
Inventor: GIORDANO GUGLIELMO
IPC: B27M3/14
Filed: 1979-01-12
Abstract: The system is used to prevent fissure formation resulting from internal growth stresses and shrinkage effects. It operates by stabilising the end faces of hard timber beams, esp. railway sleepers. One or more inward cuts (12) are made parallel to the shorter side of the rectangular beam (1), and near this side. These penetrate into the wood from the end face, in the grain direction. A metal profile ring (16) is driven into the centre zone bounded by the cuts from the end face. The ring may be rectangular, with cuts close together outside its shorter sides.
Patent FR-2415232-A1 (FR)
Title: Perfectionnements aux freins a disque
IPC: F16D65/092
Filed: 1979-01-19
Abstract: Invention concernant le freinage des véhicules. Frein à disque à pince coulissante qui comprend un élément constituant une plaque de couple, destiné à être fixé à un véhicule et un élément formant pince, monté sur la plaque de couple pour pouvoir déplacer patins de friction en les amenant en contact avec les faces opposées d'un disque tournant, un patin de friction, qui comprend une plaque de support, plane dans l'ensemble, à laquelle est fixée une garniture en matériau de friction, étant monté dans le frein, la plaque support présentant une partie de forme allongée et saillante contre laquelle bute et peut pivoter la pince au cours du fonctionnement lorsque la pince fléchit. Application à la réalisation de patins pour freins à disque, dont la plaque support de garniture est à la fois rigide et mince
Patent FR-2416397-A1 (FR)
Title: Sleeve to protect cable joint from tensile forces - has longitudinal channels in its inner surface to receive displaced grease and dirt when fitted by explosive compression
IPC: F16G11/02
Filed: 1979-01-31
Abstract: The sleeve takes up the tensile forces acting on the joint. It is applied to the joint by explosive compression. The inner surface of the sleeve has a small number of longitudinal channels (2) separated by broad arcuate ridges, so that its cross-section is a circle with protruding lobes. When the sleeve is explosively compressed, grease of dirt on the cables is forced out of the way, into the channels. The ends of the cables inside the sleeve are deformed so that they assume a polygonal cross-section, and thus cannot be pulled out of the sleeve.
Patent FR-2417503-A1 (FR)
Title: Nouvelles 2-phenylimino-imidazolidines substituees, leurs sels d'addition avec des acides, medicaments les renfermant et procedes pour leur preparation
IPC: A61P9/00
Filed: 1979-02-16
Abstract: L'invention a pour objet de nouvelles 2-phénylimino-imidazolidines substituées de formule générale :
Patent FR-2450194-A1 (FR)
Title: Submerged hydrophone listening post - comprises opposed horizontal arms contg. hydrophones, with magnetic compass providing orientation data
Inventor: HAROU CLAUDE
IPC: B63B22/00
Filed: 1979-02-28
Abstract: The horizontal submerged base carrying a number of hydrophones constitutes a listening post for under water use, the assembly takes up a small volume when closed to allow it to be jettisoned into the sea when it opens for use. A central body is suspended by a cable from a float to which it is electrically connected. The body contains a sealed tube containing the electronic circuits powered from a battery initiated by the sea water. A connecting cable extends from this assembly to a base containing a magnetic compass to provide orientation signals. The base supports two horizontal arms diametrically opposite and comprising telescopic segments. Hydrophones are contained in these tubes and are connected to the electronic circuits.
Patent FR-2451281-A1 (FR)
Title: Suspension system for articulated road vehicle - has transverse unitary assembly with transverse wheel level correcting mechanism
IPC: B60G21/05
Filed: 1979-03-15
Abstract: The suspension system is used for articulated road vehicles. It has at least two transverse unitary assemblies evenly spaced from the vehicle centre line. Each assembly end has a part to swivel on a wheel hub and another interior one swivelling on the chassis. The interior parts are fixed to the chassis by a swivel allowing it to move transversely relative to the chassis by a differential mechanism which compares the levels of the wheels relative to the chassis. An intermediate transverse member is mounted between the inner parts which move transversely and swivels on them.
Patent FR-2455282-A1 (FR)
Title: Optical appts. for selection of eggs - employs photo-detector to measure light transmission to operate selector controls
Inventor: ROUX ROLAND
IPC: B07C5/34
Filed: 1979-04-27
Abstract: Eggs are selected by their transparency to light as detected by a human eye. An electronic detector provides a signal which operates selector mechanisms to accept or reject the eggs. A visible or infrared light source comprises a number of lamps or light emitting diodes whose output is directed through an egg (2). Phototransistor detectors (3) are housed in a cylindrical rubber cap (4) located on the egg to reduce parasitic light effects. This cap comprises a bellows (4b) section with a supporting ring assembly (4a). The photodetector outputs are amplified (5) for application to an observation screen (6). The amplified signal is also used to control the components in an automatic selector mechanism. A control enables the selection to be manually controlled.
Patent FR-2424809-A1 (FR)
Title: Filtre-presse a cheminement continu, pour le traitement de produits et notamment de raisins et vinasses
IPC: B30B9/24
Filed: 1979-05-02
Abstract: FILTRE-PRESSE A CHEMINEMENT CONTINU POUR LE TRAITEMENT DE PRODUITS ET NOTAMMENT DES RAISINS ET VINASSES, CARACTERISE EN CE QU'IL COMPREND DEUX BANDES SANS FIN SUPERPOSEES QUI SE DEPLACENT DANS LE MEME SENS; UNE TREMIE DE CHARGEMENT PLACEE AU-DESSUS DE LA PARTIE INITIALE DE LA BANDE INFERIEURE; ET DES MOYENS QUI PERMETTENT DE FAIRE VARIER L'ANGLE DE CONVERGENCE FORME ENTRE LESDITES BANDES SUR LE COTE OPPOSE A LADITE TREMIE DE CHARGEMENT; LA BANDE INFERIEURE AU MOINS, PRESENTANT DES OUVERTURES POUR L'ECOULEMENT DE LA MATIERE LIQUIDE AFIN DE LA RECUEILLIR DANS UNE CUVE SOUS-JACENTE.
Patent FR-2439257-A1 (FR)
Title: Procede de traitement d'un non-tisse, en particulier d'une laine de verre, en vue de lui conferer des proprietes d'imprimabilite ameliorees et produits obtenus
IPC: D04H1/4218
Filed: 1979-06-05
Abstract: PROCEDE DE TRAITEMENT D'UN NON-TISSE CONVENANT EN PARTICULIER POUR UNE LAINE DE VERRE. ON APPLIQUE A UNE TEMPERATURE COMPRISE ENTRE 5C ET 50C, UN PLASTISOL PRESENTANT UNE VISCOSITE PRATIQUEMENT NEWTONIENNE, D'UNE VALEUR COMPRISE ENTRE 4 ET 30 POISES, SUR UNE SEULE FACE DU NON-TISSE, ET PRESSE LE NON-TISSE IMPREGNE PAR UN CYLINDRE PRESSEUR SUR UN CYLINDRE CHAUFFE A UNE TEMPERATURE DE 130 A 180C, LA FACE IMPREGNEE DU NON-TISSE ETANT PRESENTEE VERS LE CYLINDRE ET L'ENVELOPPANT. APPLICATION A LA REALISATION DE DOSSIERS POUR DES PRODUITS SERVANT AU REVETEMENT DES SOLS.
Patent FR-2458293-A1 (FR)
Title: Adjustable harness for climbing use - has strap around waist and buttocks joined by thigh straps and braces passing over shoulders
IPC: A62B35/00
Filed: 1979-06-07
Abstract: The harness comprises a strap around the wearer's buttocks, parallel to a similar waist strap (9). These are jointed by another passing rearwards from the hips (2,3) to the centre of the back. A strap passes up the back and separates into one (17) over each shoulder and down the front to the waist. The buttock strap has a thigh strap (4) each side, from the hips, between the legs and back to the hips. Between the legs the thigh straps are connected by a ring (8) and the buttock strap is strengthened locally (6) for a rope.
Patent FR-2459933-A1 (FR)
IPC: F01L3/08
Filed: 1979-06-27
Abstract: A gasket seal for the passage of a sliding rod in a guide bushing, made of plastic material and includes two serial, coaxial, staged, integral rotating sections, of which one fits over the end of the guide bushing and the second, of smaller diameter, forms a sliding seal for the sliding rod. The connection element between these two sections includes an extension of the coupling section, connected to the sliding section through a radial flange situated at the end of the sliding section, opposite the coupling section, with said connecting extension providing a certain degree of alignment flexibility between the two aforementioned sections.
Patent FR-2463241-A1 (FR)
IPC: E04D1/30
Filed: 1979-08-08
Abstract: 1. Gable tile of the type comprising a side portion (2) outside of the roofing as well as a portion (3) adjacent to said side portion (2) to allow the gable tile (1) to be hooked onto the roofing on the one hand through overlap by a first adjacent tile (4) and by a second gable tile (1) directly located above and on the other hand by transversely holding with respect to the first adjacent tile (4), characterized in that said adjacent portion (3) comprises on its face (3a) in front of the roofing a first recess (5) with a nib (6) located towards the covered end portion (1a) of the tile (1) and providing for the positioning and longitudinal locking thereof onto a counter-batten lath (7) of the roofing, and a second recess (9) located towards the opposite covering end portion (1b) of the tile (1) and providing for the positioning of said gable tile (1) through overlap upon an adjacent second tile (4) directly located underneath the first one.
Patent FR-2434896-A1 (FR)
Title: Assiette de voie ferree
IPC: E01B3/46
Filed: 1979-08-30
Abstract: Assiette de voie ferrée comportant un élément élastique et un élément rigide prévus entre le rail et la surface du sol. Application au confort des trains par absorption des bruits de roulement
Patent FR-2466255-A1 (FR)
Title: Implantable electrode for cardiac stimulator - has retractable points to grip tissue held in withdrawn position by applicator
IPC: A61N1/05
Filed: 1979-10-04
Abstract: The cardiac electrode includes a conductor intended to be implanted in the body. This consists of a central core of insulating material on to which a number of separate insulated conducting wires are woven. An electric connector is attached to one end of the conductor for attachment either to an implanted of an external cardiac stimulator. An assymetric double tipped contact is attached to the distal end of the conductor. Each tip of the contact forms the end of a separate spiral spring linked by a flexible S-shaped metal element to the conducting wire. The contact is supported in a block of silicone material compatible with biological tissue. Special pincers with a long shaft are pivoted to grip the electrode for insertion. By holding the contact in the appropriate way the points are withdrawn until they are in situ The points then grip the cardiac tissue.
Patent FR-2466740-A1 (FR)
Title: Automatic fire-arm with moving barrel - taps off gas to reduce shock load and lock firing chamber
IPC: F41A3/62
Filed: 1979-10-05
Abstract: The firearm has a barrel movable in relation to the casing, and a movable weight whose rear face forms the front wall of a variable-volume chamber. Gases tapped off propel the weight forward on firing, while force on the rear chamber wall locks the firing chamber to the breech during a first stage. In a second stage, the weight strikes a lug fixed to the barrel, opening the firing chamber to operate the fiream automatically. A second quantity of gas is tapped off to between the front face of the wieght and the lug, the space between them forming a second variable-volume chamber, reducing the speed of movement and avoiding damage due to striking the lug.
Patent FR-2438492-A1 (FR)
Title: Composition filtrante, son utilisation pour la clarification des liquides et procede pour cette clarification
IPC: B01D39/04
Filed: 1979-10-12
Abstract: LA COMPOSITION SERVANT D'AUXILIAIRE DE FILTRATION EST PREPAREE EN MELANGEANT DANS UN RAPPORT DE 95 A 50 EN POIDS D'UNE PATE DE LINTER ET DE 5 A 50 EN POIDS D'UNE PATE DE BOIS. LA PRESENTE INVENTION A COMME AUTRE ASPECT UN PROCEDE DE CLARIFICATION DE LIQUIDES, CARACTERISE PAR LE FAIT QU'ON UTILISE UNE PATE DE LINTER EN MEME TEMPS QU'UNE PATE DE BOIS DANS LES RAPPORTS INDIQUES CI-DESSUS. CET AUXILIAIRE DE FILTRATION EST UTILISE POUR LA CLARIFICATION DE BOISSONS ALCOOLIQUES, DE BOISSONS SANS ALCOOL, DE VINAIGRE ET DE DIVERS BOUILLONS DE CULTURE.
Patent FR-2468227-A1 (FR)
Title: Lamp holder for lamp without base - comprises insulating cylinder with spring plates holding pinched glass at base of lamp
Inventor: CLEMENT DANIEL
IPC: H05K3/32
Filed: 1979-10-19
Abstract: The lamp holder is intended to be mounted directly on to a printed circuit board with contacts on the underside. The holder comprises a cylindrical hollow casing made of insulating material with a shoulder near the top of the cylinder to locate it against the circuit board. Inside the cylinder are two similar metal plates (11) with tabs projecting laterally near the top of the casing. These two metal plates define a spring slot within which the lamp is held, and each have a spring tab (14) cut out and bent to make contact with the circuit board. In the lower part of the cylinder are projecting metal plates (20,21,22). These jointly make connections to the two wires on the lamp base, and grip the lamp base to prevent its accidental removal. The lamp fitting into this socket has a flat inched portion, with one wire folded back on each side of the glass. The lamp holder is for use on vehicle dashboards.
Patent FR-2442210-A1 (FR)
Title: Touret a tambour de bobinage interchangeable
IPC: B65H75/24
Filed: 1979-11-21
Abstract: Touret comportant un tambour expansible actionné par un vérin.  L'arbre creux 5, tournant dans les paliers 3, 4, porte la bride de raccordement 6. Le tambour 8 est constitué du manchon 10 portant la bride 7 et entouré d'une pièce coulissante 11 dont les surfaces en coin 12 coopèrent avec les surfaces conjuguées 14 du pourtour du tambour. La pièce 11 est solidaire du boulon 18 par l'intermédiaire de la pièce 16 et de la traverse 15. Le boulon est poussé par le ressort 20 et il subit également l'action du poussoir 21 manoeuvré par le piston 28 du vérin 25. Les brides 6 et 7 sont assemblées par l'anneau de serrage 9.
Patent FR-2446100-A1 (FR)
Title: Dispositif de surete pour levier de verrouillage du bol d'un mixer-melangeur et notamment d'un appareil melangeur-cuiseur
IPC: A47J43/046
Filed: 1980-01-11
Abstract: Dispositif de sûreté pour mécanisme de verrouillage du bol d'un mixer-mélangeur. Ce dispositif et l'interrupteur 1 du moteur sont montés sur une même plaquette 2, et l'axe 3 de cet interrupteur 1 porte une came 4 qui s'applique contre un levier 5 articulé sur cette plaquette 2 quand l'interrupteur 1 est ouvert et qui, dans la position de fermeture, libère le levier 5 dont l'extremité 6 fait alors pivoter un levier de retenue 7 disposé perpendiculairement et comportant un oeil dans lequel s'engage un ergot 12 du levier de verrouillage 10. Application notamment aux appareils mélangeurs-cuiseurs ménagers.
Patent FR-2461242-A1 (FR)
Title: Appareil de mesure de masses et de forces
Inventor: GALLO MARIO
IPC: G01G21/18
Filed: 1980-01-21
Abstract: APPAREIL DE MESURE DE MASSES ET DE FORCES LIE PAR SON SYSTEME DE MESURE, COMPRENANT UN BATI, UN SUPPORT DE CHARGE ET UN SYSTEME DE TRANSMISSION DE LA CHARGE AYANT UN RAPPORT DE TRANSMISSION FONCTION DE LA CHARGE DONT UN DES ELEMENTS AU MOINS EST UN LEVIER BASCULANT DANS LEQUEL LES NON-LINEARITES DU SYSTEME DE MESURE ET CELLES DE GROUPES D'ELEMENTS DU SYSTEME DE TRANSMISSION DE LA FORCE D'ENTREE PEUVENT ETRE ENTIEREMENT COMPENSEES PAR UN SYSTEME DE TRANSMISSION A CARACTERISTIQUE NON LINEAIRE, CE SYSTEME DE TRANSMISSION AYANT PAR AILLEURS UNE COMPLAISANCE MECANIQUE INFERIEURE A CELLE DES APPAREILS CONNUS, DE PLUS CET APPAREIL PERMET UN AJUSTEMENT AISE DES PARAMETRES PROVOQUANT UNE NON-LINEARITE ET UNE JUSTIFICATION FACILE DE LA VARIANCE DE CES PARAMETRES.
Patent FR-2449950-A1 (FR)
Title: Reservoir annulaire pour emmagasiner un materiau nucleaire et procede pour sa fabrication
IPC: G21F9/22
Filed: 1980-02-12
Abstract: LA PRESENTE INVENTION CONCERNE UN RESERVOIR ANNULAIRE 21 POUR L'EMMAGASINAGE D'UN MATERIAU NUCLEAIRE DANS UN ESPACE ANNULAIRE FORME DE FLASQUES ANNULAIRES INFERIEUR ET SUPERIEUR 14, 10 SANS SOUDURE POSITIONNES EN ELEVATION SELON UN ESPACE PREDETERMINE ET DES CHEMISES INTERNE ET EXTERNE 18, 19 REUNISSANT LES PERIPHERIES INTERNE ET EXTERNE DESDITS FLASQUES SUPERIEUR ET INFERIEUR. LE RESERVOIR EVITE LES CONTRAINTES THERMIQUES ET LES DEFORMATIONS EN FABRIQUANT LES FLASQUES INFERIEUR ET SUPERIEUR SANS SOUDURE DE MANIERE A ACCROITRE L'EFFET DE DISSIPATION DE LA CHALEUR.
Patent FR-2449900-A1 (FR)
Title: Dispositif de traitement de signaux radar pour ameliorer la detection visuelle de cibles a longue distance et radar en comportant application
IPC: G01S7/292
Filed: 1980-02-21
Abstract: L'INVENTION CONCERNE UN RADAR PERMETTANT UNE MEILLEURE DETECTION VISUELLE DES CIBLES A LONGUE DISTANCE. IL COMPORTE ESSENTIELLEMENT UN DISPOSITIF 124, 126 QUI CONVERTIT UN SIGNAL D'ECHO DE RADAR EN UN SIGNAL DE TENSION D'AU MOINS DEUX NIVEAUX DISCRETS, UN DISPOSITIF 198 QUI ALLONGE LA DUREE D'UN PREMIER NIVEAU EN FONCTION DIRECTE DE LA DISTANCE ET UN DISPOSITIF 118 PERMETTANT DE VISUALISER LE SIGNAL DE SORTIE DU DISPOSITIF D'ALLONGEMENT 198. L'INVENTION S'APPLIQUE NOTAMMENT A UN RADAR DE MARINE.
Patent FR-2476657-A1 (FR)
Title: Polyvinylidene fluoride copolymers grafted with e.g. basic monomer - used as conductive membrane in e.g. electrochemical redox reactions
Inventor: BLAISE JEAN
IPC: C08F259/08
Filed: 1980-02-26
Abstract: Grafted copolymers useful as membranes are prepd. by grafting a basic or amphoteric monomer onto a preirradiated polyvinylidene fluoride (PVDF) backbone. Pref. the monomer is 2-(or 4-) vinylpyridine; 2-Me-5-vinyl-pyridine; di(m)ethylaminoethyl or propyl (meth)acrylate; N-vinylpyrrolidone; N-vinylcaprolactone or dimethylaminopropyl-methacrylamide. The grafted copolymers have significantly reduced electrical resistance compared to PVDF. The membranes are used partic. in electrochemical redox reactions in acid medium and as ion exchange membranes. The prod. has good mechanical props. and adequate conductivity in acid or basic medium. Pref. the monomer is contacted with the pre-irradiated PVDF for 4-12 hrs. at 50-80 deg.C. The monomer is pref. associated with water (and opt. another solvent) as solvent during the grafting reaction.