baber/WOPTO huggingface dataset:
Patent EP-0009362-A1 (EP)
Inventor: RASMUSSEN CHRIS ROYCE
IPC: C07D233/44
Filed: 1979-09-11
Abstract: Heterocyclic derivatives of guanidine selected from the group consisting of a compound having the formula:
     and the pharmaceutically acceptable acid addition salts thereof wherein;
     Z is selected from the groups
     
     wherein:   A is 0 and S;   n is zero or 1;   R, is methyl and ethyl;   R 2  is loweralkyl, cyclopentyl, cyclohexyl and benzyl;
     taken together represents
     wherein W is 0, S, N-loweralkyl and N-aryl; and   R 3  is alkyl having from 4 to 10 carbons;   phenyl; methylenedioxyphenyl; phenyl substituted with from 1 to 3 substituents consisting of halo, loweralkyl, and loweralkoxy; and phenyl substituted with hydroxy, benzyloxy, nitro; trifluoromethyl and methylthio;   naphthyl; cyclopentyl; cyclohexyl; exo-2-norbornyl; endo-2-norbornyl; 1-adamantyl;   arylalkyl in which the aryl function is phenyl and the alkyl function has from 1 to 4 carbons; and   diphenylalkyl in which the alkyl function has from 1 to 2 carbons, possess pharmacological properties, particularly as hypoglycemic agents.
Patent EP-0013535-A1 (EP)
Inventor: SCHEIWILLER ROLF
IPC: E02D29/02
Filed: 1979-07-20
Abstract: 1. A set of retaining wall elements for the construction of a plantable retaining wall, wherein each element (1, 7, 13, 15, 18) has an essentially rectangular form with framelike walls, at least one (3) of said walls being raised as compared with the surface of the other walls, characterized in that the walls (2, 3 ; 9, 10 ; 19, 20) of the elements (1, 7, 13, 15, 18) having a through opening are convex and that at a standard element (1, 18) the two walls (2) adjacent the raised wall (3) comprise each at the surface a locking cam (4).
Patent EP-0015939-A1 (EP)
Inventor: YURDIN CARL
IPC: G03B11/04
Filed: 1979-11-05
Abstract: Un pare-soleil d'objectif repliable comprend un soufflet pliant (1) rattache a un element en forme de plaque avant (2) et a un element en forme de plaque arriere (3). Un guide (5) est rattache a l'une des plaques avant (2) et arriere (3), de preference la plaque avant (2), et des moyens de verrouillage (7, 11) sont prevus pour verrouiller le guide (5) dans une position d'allongement par rapport a l'element-plaque (2, 3) auquel il est rattache par pivotement. Des moyens de coulissement (12) sont couples a l'autre element avant (2) ou arriere (3) pour lui permettre de coulisser le long de la longueur du guide (5) lorsque celui-ci se trouve dans une position allongee, verrouillee, et des seconds moyens de verrouillage (14) sont prevus pour verrouiller les moyens de coulissement (12) a des positions choisies sur la longueur du guide (5). Des bagues d'adaptation interchangeables (20) sont prevues pour pouvoir utiliser le pare-soleil d'objectif avec des lentilles de differents diametres. Des moyens (32, 36) sont prevus pour introduire des filtres ou autres plaques a effet special ainsi qu'une semelle pour flash ou accessoire.
Patent EP-0042373-A1 (EP)
Inventor: FURBY JIM
IPC: B28D1/26
Filed: 1979-06-07
Abstract: Une machine a smillage pour rendre rugueuses les surfaces des sols durs tels que des routes en beton, comprend plusieurs cylindres montes sur ou dans un chassis (1), chaque cylindre ayant un outil a smiller (6) insere de maniere amovible dans son extremite. Un piston est recu completement dans chaque cylindre et possede un mouvement de va-et-vient sous la pression d'un fluide pour la percussion de l'outil (6). Le chassis (1) est fait en une seule piece de coulee incorporant un dispositif de lubrification et une barre de manipulation (2) et au moins trois roues (3, 4, 5), dont l'une au moins est une roue pivotante.
Patent EP-0015271-A1 (EP)
Inventor: WATERBURY NELSON J
IPC: B65D39/04
Filed: 1979-12-17
Abstract: Un recipient (10) ayant une fermeture articulee pour une ouverture (13) dans le couvercle (11) dans lequel une extremite (14) de la fermeture est montee sur le couvercle adjacente a l'extremite interieure de l'ouverture, un element de fermeture (15) est articule a l'extremite montee et recouvre l'ouverture pour enfermer le contenu et un element de relevage (17) est forme integralement sur l'element de fermeture a l'oppose de l'extremite montee pour lever l'element de fermeture par pivotement par rapport a l'extremite montee pour avoir acces a l'ouverture en vue de vider le contenu du recipient.
Patent EP-0036433-A1 (EP)
Inventor: ROSS KARL-HEINZ DR
IPC: C07D307/32
Filed: 1980-03-20
Abstract: 1. A process for the preparation of 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one, wherein (a) hex-3-ene-2,5-diol (V) is epoxidized in a conventional manner in the liquid phase, by means of hydrogen peroxide in the presence of an oxide of a metal of subgroups IV to VIII or of a heteropolyacid of one of the acid-forming elements of group VI of the periodic table of the elements, at a pH of from 3 to 7, preferably from 4 to 6, to give 3,4-epoxy-hexane-2,5-diol (II), (b) the resulting 3,4-epoxy-hexane-2,5-diol is converted at 40 to 280 degrees C in a conventional manner, by means of catalytic amounts of an acid, by cleavage of the epoxide ring and subsequent cyclization, into 2,5-dimethyl-3,4-dihydroxy-tetrahydrofuran (III), (c) the resulting 2,5-dimethyl-3,4-dihydroxy-tetrahydrofuran is dehydrogenated by means of oxygen or an oxygen-containing gas over a silver or copper catalyst, at from 400 to 700 degrees C, to give 2,5-dimethyl-4-hydroxy-tetrahydrofuran-3-one (IV), and (d) the resulting 2,5-dimethyl-4-hydroxy-tetrahydrofuran-3-one is oxidized with bismuth oxide, in concentrated acetic acid solution, to give 2,5-dimethyl-4-hydroxy-2,3-dihydrofuran-3-one.
Patent EP-0022995-A1 (EP)
Title: Rotor à écran amortisseur pour alternateur à pôles saillants
Inventor: ALLEGRE JEAN
IPC: H02K3/20
Filed: 1980-07-11
Abstract: L'invention concerne un rotor a écran amortisseur pour alternateur à pôles saillants. L'écran amortisseur, du type cage d'écureuil, comporte non seulement des barreaux classiques (10) noyés dans les épanouissements polaires (6a, 6b), mais aussi des barreaux interpolaires (22) dont les ailes (26a, 26b), sont disposées entre les épanouissements polaires consécutifs (6a, 6b) et assurent l'amortissement des composantes du flux magnétique variable qui présentent des pas spatiaux importants. Application à la production d'énergie électrique, notamment par groupe bulbe.
Patent EP-0024343-A1 (EP)
Inventor: SCHWING FRIEDRICH DIPL-ING
IPC: F04B7/00
Filed: 1980-08-13
Abstract: Bei einer Dickstoffpumpe, insbesondere zur Förderung von Beton durch das Gehäuse (3) einer Rohrweiche (2), welche einen auf einer Schwenkwelle (44) befestigten Schwenkkörper (26) aufweist, der eine in einer Gehäusewand (4) angebrachte Austrittsöffnung (25) mit zwei in einer anderen Gehäusewand (4) angeordneten Eintrittsöffnungen (6, 7) abwechselnd verbindet, wobei die Mittelpunkte der Ein- (6, 7) und Austrittsöffnungen (25) jeweils in radialem Abstand von der Wellenachse (35) angeordnet sind, ist zur Verminderung der mechanischen Belastungen der die Eintrittsöffnungen (6, 7) aufweisenden Gehäusewand (4) durch den Schwenkkörper (26), ohne daß vergrößerte Biegebelastungen der Schwenkwelle (44) in Kauf genommen werden müssen, die Schwenkwelle (44) axial abgestützt und die Abstände der Eintrittsöffnungen (6,7) und der Austrittsöffnung (25) von der Wellenachse (35) so unterschiedlich gewählt, daß der Abstand (R1) der Eintrittsöffnungen (6,7) größer als der Abstand (R2) der Austrittsöffnung (25) ist. Dabei erreicht man völlige Momentenfreiheit wenn im Schwenkkörper (26) das Produkt aus der Austrittsfläche bzw. den -flächen (32) und des Abstandes des gemeinsamen Flächenschwerpunktes von der Wellenachse (35) gleich dem Produkt aus der Eintrittsfläche (28) und des Abstandes ihres Flächenschwerpunktes von der Wellenachse (35) ist.
Patent EP-0027606-A1 (EP)
Inventor: GROH WOLFGANG DR
IPC: C09J153/02
Filed: 1980-10-10
Abstract: The hot-melt adhesive is composed of a non-hydrogenated, linear block copolymer A-B-C, a customary tackifying resin and a customary rubber extender oil. The linear block copolymer has a terminal nonelastomeric polymer block which accounts for from 5 to 25% by weight, based on A-B-C, and is composed of aromatic monovinyl monomers; it further contains an elastomeric (co)polymer B as centrepiece in a proportion of from 50 to 85% by weight, based on A-B-C; this is composed either of isoprene alone, which is preferred, or of a mixture of isoprene and butadiene, in which case butadiene contents of from 5 to 70% by weight are employed. The polymer C accounts for from 5 to 40% by weight, based on A-B-C, and consists either of a homopolymer of isoprene, in which case more than 50% by weight of 3,4-linked units should be present, or of a copolymer of styrene and butadiene or of styrene and isoprene in certain ratios, in which case the monomers must be present in random distribution.
Patent EP-0028839-A1 (EP)
Inventor: PRENGAMAN RAYMOND DAVID
IPC: C25C1/18
Filed: 1980-11-12
Abstract: An electrolyte and a process for reducing lead peroxide formation when electrowinning lead from inorganic acid solutions are disclosed. In accordance with the invention, arsenic is added to an inorganic acid electrolyte containing lead, whereby oxygen is evolved at the anode while lead peroxide formation is reduced or eliminated during electrolysis.
Patent EP-0022351-A1 (EP)
Inventor: BISZANTZ DONALD W
IPC: B23D51/12
Filed: 1980-07-02
Abstract: A multi-tension hacksaw including a longitudinally extending frame member (130) having a first blade support member (110) on one end and a bracket (135) on the other end extending laterally therefrom a second blade support member (140) pivotally mounted on the bracket (135), a tensioning rod (160) having a threaded first end (161) adjacent to the first blade support member (110) and a second end (162) pivotally connected to the second blade support member (140), an elongated crank handle (170) threadedly and rotatably engaging the threaded first end (161) of the tensioning rod (160) so that rotation of the crank handle (170) applies tension to the tensioning rod (160), and a tension indicator (180) including a pointer (185) mounted on the bracket (135) and a tension indicia (145, 146) on the second blade support member (140) cooperating with the pointer (185).
Patent EP-0015811-A1 (EP)
Inventor: PAUTROT JEAN-MARC
IPC: C22B60/02
Filed: 1980-02-22
Abstract: The invention concerns a process for the recovery of the uranium contained in an impure phosphoric acid. The impure acid is treated with an organic phase capable of extracting U (VI), and the resultant organic phase is then re-extracted with an aqueous solution containing complexing acid and an oxidizing-reducing agent in the reduced state, said oxidizing-reducing agent being capable of reducing U+6 to U+4 in said aqueous solution. The resultant aqueous phase is then subjected to electrochemical oxidation, followed by extraction with a second organic phase from which the uranium is recovered, the depleted aqueous solution being recycled to the re-extraction after electrochemical reduction, with the process comprising two organic phase cycles and a cycle of a complexing aqueous solution. The process is of particular interest when applied to the recovery and concentration of uranium contained in a wet process phosphoric acid.
Patent EP-0018916-A1 (EP)
Inventor: BELVAL MICHEL
IPC: G01M3/16
Filed: 1980-04-30
Abstract: Le sous-ensemble comprend une coquille 18 rigide et électriquement isolante dont la face interne est complémentaire de la face externe d'un organe d'un circuit dans lequel circule le métal liquide, des rainures ouvertes 20 étant formées sur la face interne de la coquille pour recevoir des éléments électriquement conducteurs 22 maintenus espacés de la face interne par des moyens de retenue constitués, par exemple, par une partie de largeur réduite desdites rainures. Application à la détection de fuites de métaux liquides.
Patent EP-0021930-A1 (EP)
Title: Dispositif de synchronisation d'un circuit générateur de caractères et d'un circuit de balayage vertical et récepteur de télévision comportant un tel dispositif
Inventor: VAN DEN DRIESSCHE MICHEL
IPC: H04N5/45
Filed: 1980-06-06
Abstract: L'invention concerne les dispositifs d'affichage d'une étiquette sur un écran de visualisation. L'affichage d'informations insérées dans une image de fond est réalisé par un circuit générateur de caractères (7). La stabilité de l'étiquette nécessite la synchronisation du balayage vertical de l'image et de l'étiquette. Cette synchronisation est obtenue par mesure du courant qui traverse le déviateur (4) du tube cathoscope : l'information acquise, amplifiée, est appliquée à un détecteur de seuil (15) qui commande le circuit d'affichage (7). Le début et la fin de synchronisation sont réglés par deux tensions de référence (Vb, Vc). Application à l'affichage d'informations sur les écrans des récepteurs de télévision ou des consoles de visualisation.
Patent EP-0016717-A1 (EP)
Inventor: MONTABERT ROGER
IPC: E21B15/00
Filed: 1980-03-19
Abstract: A mining drill comprising a rail along which a mining drill head is slidably rectilinear, this rail being carried by a hydraulic motor pivotally connected to a rotary head at the end of an arm swingable about a pivot axis which is generally horizontal and is formed by a column or post. A first hydraulic motor is provided to rotate the post about a generally upright axis and hydraulic cylinders can be provided to swing the post about a pivot close to its pedestal. The device is designed to support the rail so that substantially parallel holes can be drilled in a subterranean structure in practically any direction, e.g. with any inclination to the axis of the main gallery, but especially parallel thereto.
Patent EP-0034771-A1 (EP)
Inventor: KIRNER HANS DIETER DR
IPC: C09K23/52
Filed: 1981-02-13
Abstract: The dispersion contains (a) from 30 to 60% by weight of one or more active ingredients having a mean particle size of less than 5 mu , (b) from 0.1 to 5% by weight of one or more water-soluble homopolymers or copolymers of a N-vinyl-lactam, (c) from 0.1 to 5% by weight of one or more anionic compounds devoid of dispersant character, (d) from 0 to 30% by weight of one or more humectants and (e) water. The active ingredient is sparingly soluble or insoluble in water. The copolymer may be derived from two or more different N-vinyl-lactams or from one or more N-vinyl-lactams and one or more other compounds copolymerizable therewith. The anionic compound or compounds is or are chosen from the group comprising water-soluble alkali metal salts or ammonium salts of aromatic monosulfonic acids, disulfonic acids and trisulfonic acids, which acids may be substituted by alkyl groups of at most 8 carbon atoms or by a cycloalkyl group of at most 6 carbon atoms. The dispersion is prepared by wet milling of corresponding amounts of components (a), (b), (c) and (d) until the mean particle sizse of component (a) is less than 5 mu . Depending on the active ingredient present, the dispersion may be used, inter alia, as a finishing agent for plastics, paper or textiles.
Patent EP-0041109-A1 (EP)
Inventor: BROCKHAUS RUDOLF DR
IPC: C07C51/00
Filed: 1981-03-26
Abstract: 1. Process for the preparation of acetic by oxidation of sec.-butyl acetate in the liquid phase at temperatures from 150 to 190 degrees C with oxygen or oxygen-containing gases, such as air, characterised in that the reaction is carried out in the presence of 1 to 300 ppm of cobalt ions in the reaction solution under pressures from 7 to 30 bar and the oxygen content in the entire reaction space, including the condenser and the pipes as well as the exit gas, is maintained at 1 to 6% by volume, preferably 3 to 5% by volume, additional oxygen being metered into the condenser and/or into the pipe between the reaction vessel and the condenser, in order to maintain this oxygen content.
Patent EP-0039456-A1 (EP)
Inventor: HAAF FRIEDHELM
IPC: C10B25/16
Filed: 1981-04-24
Abstract: 1. Coke oven door with a sealing section which is constructed around its periphery and comprises a sealing strip which comes to rest with one edge on the oven frame and a sealing plate connected by one arm approximately at right angles to the sealing strip and fixed by another arm to the oven door, and also has angular pressure plates which press on the sealing strip and compression springs arranged between the pressure plates and abutments mounted on the oven door, characterised in that clip bolts (6) having a T-shaped profile are provided which have a first bolt (7) which serves to retain the abutment (12; 28; 29; 31) and to guide the pressure plate (14) so that it slidably movable, and a second bolt (8) which is arranged at right angles to the first bolt (7) and serves to fix the clip bolt (6) on the oven door, and a clamp attachment (9) which is provided as an extension of the first bolt (7) and serves to clamp the sealing section (2) onto the oven door.
Patent EP-0039871-A1 (EP)
Inventor: DROGUET JEAN-PAUL
IPC: G02F1/01
Filed: 1981-05-05
Abstract: A two dimensional display unit with an electrically controlled fluid and a method of manufacturing it. A layer of liquid crystal whose birefringence is electrically controlled is disposed between two thin glass plates which bear transparent electrodes and are connected together by metal studs regularly spaced apart over the whole useful surface so as to maintain a gap of constant thickness, the cell thus constituted being illuminated by parallel light and placed between crossed polarizer and analyzer. The invention applies to displaying various images at a low cost.
Patent EP-0042500-A1 (EP)
Inventor: MOLLER DIETER DIPL-CHEM
IPC: B05D7/26
Filed: 1981-05-29
Abstract: Einbrennlack auf der Basis von Acrylatpolymeren in organischen Lösungsmitteln gegebenenfalls mit farbgebenden Pigmenten und/oder Füllstoffen unter Verwendung einer Kombination von zwei Acrylatpolymeren A und B, wobei das Acrylatpolymer A ein Mischpolymerisat aus copolymerisierbaren äthylenisch ungesättigten Verbindungen mit freien Carboxylgruppen aus einpolymerisierter alpha, beta-äthylenisch ungesättigter Carbonsäure ist, wobei ein Teil der freien Carboxylgruppen mit einem Glycerinrest, der noch andere Fettsäurereste in Esterbindung enthält, derart verestert ist, daß auf 1000 g Acrylatpolymer 0,5 bis 3 Mol freie alpha, beta-äthylenisch ungesättigte Carbonsäure und 0,6 bis 2 Mol mit dem Glycerinrest veresterte alpha, beta-äthylenisch ungesättigte Carbonsäure kommen und das Acrylatpolymer B ein Polymerisat aus einer alpha, beta-äthylenisch ungesättigten Carbonsäure und gegebenenfalls anderen copolymerisierbaren äthylenisch ungesättigten Verbindungen ist, deren Carboxylgruppen mit einem Rest verestert sind, der mindestens eine Epoxidgruppe enthält, wobei die Anzahl der Epoxidgruppen so gewählt ist, daß ein Epoxidäquivalentgewicht zwischen 120 und 2000 vorhanden ist. Der Einbrennlack wird zum Herstellen von Einbrennüberzügen verwendet.
Patent EP-0044028-A1 (EP)
Inventor: HIRSCHBERG RUDOLF DR
IPC: C01G49/00
Filed: 1981-07-08
Abstract: Chlorofluoroferrate (II, III) werden durch Verschmelzen von Alkali- oder Ammonium-halogeniden mit einem Eisen (III)-halogenid und metallischem Eisen hergestellt. Als Ausgangsmaterialien dienen insbesondere (a) ein Alkalimetallchlorid oder Ammoniumchlorid, (b) ein Alkalimetallfluorid oder Ammoniumfluorid, (c) wasserfreies Eisen(III)-chlorid und (d) Eisenpulver. Die Reaktion wird bei einer Temperatur von 300 bis 900°C durchgeführt. Die Chlorofluoroferrate, die im Vergleich zu üblichen Chloroferraten eine deutlich geringere Hygroskopizität aufweisen, eignen sich insbesondere als aktive Füllstoffe für Schleifscheiben.
Patent EP-0049757-A1 (EP)
Inventor: DORN WOLFGANG
IPC: F42B23/04
Filed: 1981-09-03
Abstract: Mine, insbesondere zur Panzerbekämpfung, die durch Abwurf aus der Luft oberflächenverlegbar ist und in einer bevorzugten Aufschlagrichtung auf den Boden auftrifft. Das Minengehäuse ist in ein den Zünder (3) enthaltendes Funktionsteil (1) und ein den Sprengstoff (4) enthaltendes Wirkteil (2) unterteilt. Beide Teile sind formschlüssig miteinander verbunden. Diese Formschlußverbindung wird bei Überschreiten einer vorgegebenen Aufschlagbelastung gelöst. Durch den Aufschlagstoß werden dann Funktions- und Wirkteil räumlich voneinander getrennt, so daß die Mine bei einem unzulässig starken Bodenaufschlag außer Funktion gesetzt ist.
Patent EP-0049863-A1 (EP)
Inventor: SCHMIDT HANS-JOACHIM DR
IPC: C07C29/15
Filed: 1981-10-07
Abstract: Die Erfindung betrifft ein Verfahren zur Herstellung von Essigsäure, Acetaldehyd und Ethanol durch Umsetzung von Kohlenmonoxid und Wasserstoff in der Gasphase an Rhodium und ggf. Promotoren enthaltenden Katalysatoren bei erhöhten Temperaturen und erhöhten Drucken. Dabei wird in der Anfangsphere des Verfahrens während des Aufheizens des Katalysators auf die für den Dauerbetrieb vorgesehene Betriebstemperatur TR die Temperaturerhöhung im Temperaturbereich zwischen TO und TR, wobei TO 75 bis 125°C unterhalb TR liegt, kontinuierlich oder in Temperaturstufen von maximal 10°C und in einem Zeitraum von 100 bis 1000 Stunden vorgenommen. Die Temperatur wird während dieser Zeit in einem beliebigen 10-Stunden-Intervall um maximal 10°C erhöht.
Patent EP-0053277-A1 (EP)
Inventor: JESCHKE WILLI
IPC: B41F13/08
Filed: 1981-10-27
Abstract: 1. Cylinder for printing units of rotary presses with cylinder bearers (3, 10) provided at either side in contact with the cylinder end faces (4), said cylinder bearers (3, 10) being mounted on the cylinder (1) centralized with respect to the latter's rotation axis by means of a conical centering ring surface (7), wherein on the side facing the cylinder (1) and starting from its cylindrical bore (11) the cylinder bearer (3) exhibits the conical centering ring surface (7) with which it is centered by axial pressure on a centering edge (6) of a cylindrical centering ring (5) adjacent to the cylinder end face (4).
Patent EP-0053336-A1 (EP)
Inventor: SYLLA JURGEN
IPC: G03B23/04
Filed: 1981-11-21
Abstract: A slide projector has a slide exchange element and a slider movable on the latter and having different widths suitable for magazines with different slide compartment widths, wherein the slider is engageable with the slide exchange element under the action of a spring in direction normal to the displacement direction of the slide exchange element, a magazine sensing element senses a magazine inertable into a respective magazine path and provides for disengagement of the slider from the slide exchange element, and an abutment slides in the displacement path of the slider in the disengaged position of the same.
Patent EP-0056459-A1 (EP)
Inventor: KOTH DETLEV DR
IPC: B01D53/68
Filed: 1981-12-10
Abstract: The elemental halogen to be removed, is formed in a side reaction which can lead to undesirable contamination of the silica. It is removed by mixing the reaction products during cooling with methane or methane-containing gases, such as, for example, natural gas.
Patent EP-0033658-A1 (EP)
Inventor: PRYKE JOHN FORDHAM SPEAIGHT
IPC: E02D27/48
Filed: 1981-02-03
Abstract: During the construction of an in situ cast concrete beam in a slot cut in a building wall, the wall (28) above is temporarily supported from the wall (17) below by a stool (11). The stool consists of a top plate (12), a bottom plate (13), and an intervening body comprising an upper plate (14), a lower plate (16), and a leg (15). The body and plate (12) are lifted, so as to tighten any looseness in the wall (28) above by hydraulic jacks (29). Packing is then inserted between the lower plate (16) and bottom plate (13) and the jacks (29) are removed before a beam is cast incorporating the stools. In this way only inexpensive parts are sacrificed within the beam and the jacks, and possibly containment (19) for the packing are recovered and reuseable.
Patent EP-0039248-A1 (EP)
Inventor: KASUGA TAKUZO
IPC: C23C18/24
Filed: 1981-04-30
Abstract: A method for the surface treatment of polyacetal resin characterised inthatthe resin is treated with an acidic solution containing chloride ions and sulfuric acid ions.