baber/WOPTO huggingface dataset:
Patent ES-8608037-A1 (ES)
Title: Detergent compositions.
IPC: C11D11/02
Filed: 1984-12-18
Abstract: Detergent compositions which comprise base powder granules containing detergent active materials and amorphous aluminosilicate together with a post-dosed peroxygen bleach compound exhibit improved ion-exchange properties and bleach stability if the level of moisture in the granules lies between given limits which depend on the levels of aluminosilicate, detergent active and alkaline salt if any present in the granules. Exemplified moisture contents lie between 10.7% and 21.0% of the base powder granules.
Patent ES-8606154-A1 (ES)
Title: Hydraulic assistance device.
IPC: B60T13/12
Filed: 1985-02-28
Abstract: Hydraulic assistance device of the mixed hydrodynamic/hydrostatic type incorporating a body (10) in which a first piston (18) is slideably mounted and moveable between a first position allowing the communication of a first chamber (53), joined to a braking circuit, to a reservoir (12), and isolating this chamber (53) from a source of high pressure fluid (86), and a second position isolating the chamber (53) from the reservoir (12) and connecting it with the source (86) a second chamber (30) in the body (10) connected by a passage (90) to the brakes (66), and valve mechanism (92) normally closing the passage (90) and sensitive to the pressure in the chamber (30) so that, when the latter pressure reaches a value which is greater than that existing in the first chamber (53), the valve mechanism (92) opens allowing fluid to flow between the second chamber (30) and the brakes (66).
Patent ES-8602552-A1 (ES)
Title: Prevention of corrosion
IPC: C09K5/20
Filed: 1985-03-05
Abstract: Corrosion inhibitor used in a liq. system consists of (a) vegetable tannin(s) or deriv(s). (I), a water-soluble salt(s) (II) of a gp. II metal, pref. Zn, Mg or Ca, esp. Ca acetate (IIA), and hydroxylamine(s) (III) and/or neutralising amine(s) (IV); (b) (I), a water-soluble Mg salt, (III) and/or (IV), pref. 2-amino-2-methylpropano) (IVA), and/or a triazole (V), pref. benzotriazole (VA); or (c) (I) and a Ca salt. - Pref. (I) is a sulphite extract of naturally occurring vegetable tannin(s) based on catechol. (II) is a chloride, nitrate or acetate. (III) is of the formula (R1)(R2)N-O-R3; R1, R2 and R3 independently = H, 1-8 C alkyl, aryl or aryl (lower alkylene); and pref. is N,N-dithylhydroxylamine (IIIA). The system may also contain corrosion inhibitor. The system is an alcoholic system, pref. a methyl, ethyl or propyl alcohol, ethylene glycol, propylene, diethylene glycol, dipropylene glycol or glycerol system, contg. 10-50 wt.% alcohol and 90-40 wt.% water. - water.
Patent ES-8604179-A1 (ES)
Title: Thiazolidine derivatives, process for the preparation and pharmaceutical compositions thereof
IPC: A61P1/04
Filed: 1985-06-17
Abstract: Thiazolidine derivs. of formula (I) : Ar = a phenyl, naphthyl or pyridyl gp. opt. substd. by 1 or more 1-4C alkyl, haloalkyl, alkoxy, haloalkoxy, OH and/or NO2 gps. and/or by a 2-cyanoimino-3-thiazolidi nthyl gp., or Ar = 2-furyl; Y=NCN, NCONH2 or CHNO2. - Specifically claimed is 3-benzyl-2-cyano imino-thiazolidine (Ia).
Patent ES-8608382-A1 (ES)
Title: Installation for continuously supplying fractionated solid materials to a treatment machine.
IPC: B29C48/285
Filed: 1985-07-16
Abstract: Installation for introducing fractionated solid materials, for example powder, granular material, fiber and the like, into a treatment machine, particularly an extruder (1, 2), with a supply funnel (3) and one or a plurality of supply screws (5) which actually traverse the supply funnel. In order to obtain a uniform flow rate of fractionated solid materials uniformely and continuously supplied inside the supply funnel, there is arranged at a certain distance therefrom and substantially coaxially a funnel-shaped element (9). The supply screw or screws traverse the supply funnel without touching it, the member configured as a transport trough (10) projecting outside the supply funnels. Outside the supply funnel (3), the transport trough (10) is connected to a vibrator (13).
Patent ES-8701707-A1 (ES)
Title: Fungicides.
IPC: C07C69/618
Filed: 1985-10-18
Abstract: Chemical compounds of the formula: < CHEM > in which R<1>, X, Y and Z have various specified values. The compounds are useful in the preparation of agricultural acrylic acid derivatives described in EP-A-178826.
Patent ES-8703952-A1 (ES)
Title: Sewing machine needle thread supply appts.
IPC: D05B87/02
Filed: 1986-05-06
Abstract: The needle thread supply appts. includes two spaced guides each having a through passage for the needle thread. Reciprocable across the passages in the space between the guides is a thread take-up lever which entrains the thread in a V-shaped loop and then releases the loop. Pref. the lever is reciprocated from the machine main shaft, either pivotally or slidably.
Patent ES-8707580-A1 (ES)
Title: Mast made from plastic material for supporting especially electric wires, and device for winding fibres around this mast.
IPC: B29C53/66
Filed: 1986-05-27
Abstract: A cylindrical pole of plastic material having the primary function of supporting electric power transmission lines is reinforced by a filament-wound structure in which the filament density decreases progressively from the lower end to the upper end of the pole and has the effect of modifying the mechanical characteristics along the length of the pole.
Patent ES-8706465-A1 (ES)
Title: Water distributor for energy recovery in desalination plants
IPC: C02F1/44
Filed: 1986-06-25
Abstract: The distributor, for use in recovery of energy in plants for water desalination by reverse osmosis, consists of a pump passing the water being treated through pipe in which is accumulator to a reverse osmosis module with another accumulator in the inlet pipe and a new accumulator in the outlet pipe for the brine, the treated water leaving the pipe; and a double hydraulic cylinder with internal partition, in which operates pistons forming chambers.
Patent IE-902332-A1 (IE)
Title: Aqueous pharmaceutical suspension for substantially water insoluble pharmaceutical actives
Inventor: JR WALTER G GOWAN
IPC: A61K31/192
Filed: 1990-06-27
Abstract: The present invention relates to an aqueous pharmaceutical suspension composition comprising: from about 0.2% to 20% of a substantially water insoluble pharmaceutical active, e.g. ibuprofen; a suspension stabilizing effective amount of xanthan gum, pregelatinized starch and polyoxyethylene sorbitan monooleate; an effective amount of taste masking composition; and water, as well as a process for producing such aqueous pharmaceutical suspensions.
Patent IE-912623-A1 (IE)
Title: Cloning of the biosynthetic pathway genes for¹chlortetracycline production from streptomyces aureofaciens¹& their expression in streptomyces lividans
IPC: C12N15/09
Filed: 1991-07-25
Abstract: The present invention relates to the cloning, isolation and DNA (isolated fragment from Streptomyces aureofaciens) which directs the synthesis of tetracycline and chlortetracycline, in a heterologous host such as Streptomyces lividans. The claimed plasmids are isolated by screening a cosmid library, constructed in Escherichia coli, for the expression of tetracycline resistance in S. lividans.
Patent IE-902907-A1 (IE)
Title: Human thrombomodulin derivatives
IPC: C07K14/745
Filed: 1990-08-10
Abstract: Soluble human thrombomodulin derivatives comprise the N-terminal, epidermal growth factor homology and serine/threonine-rich regions of human thrombomodulin but lack the transmembrane and cytoplasmic domains of human thrombomodulin. Recombinant vectors and host cells for the production of these derivatives are provided.
[EP0412841A1]
Patent IE-902983-A1 (IE)
Title: Triglyceride-free cheese slices and methods for manufacture¹thereof
IPC: A23L29/262
Filed: 1990-08-17
Abstract: Substantially fat-free cheese slice products and methods for manufacturing such products, comprising less than about 1.67 weight percent fat.
Patent IE-913609-A1 (IE)
Title: Unsaturated hydroxyalkylquinoline acids as leukotriene¹antagonists
IPC: A61P9/00
Filed: 1991-10-16
Abstract: Compounds having the formula I: <CHEM> are leukotriene antagonists and inhibitors of leukotriene biosynthesis. These compounds are useful as anti-asthmatic, anti-allergic, anti-inflammatory, and cytoprotective agents. They are also useful in treating angina, cerebral spasm, glomerular nephritis, hepatitis, endotoxemia, uveitis, and allograft rejection.
Patent IE-914003-A1 (IE)
Title: Biologically Active Amines
IPC: C07D277/68
Filed: 1991-11-18
Abstract: There are disclosed compounds of the formula (I): Ar-CH2CH2-NH-CR<1>R<2>-X-Y in which Ar represents a group  alpha , X represents a C1-12 alkylene chain optionally interrupted or terminated by one or more groups selected from -S-, -SO-, -SO2-, -O-, CR<6>R<7>, phenylmethyne, -NH-, -CONH-, -NHCO- and -NHCONH-, Y represents an optionally substituted aryl or cycloalkyl group, R<1>, R<2>, R<5>, R<6>, R<7> and R<8> each independently represent hydrogen or alkyl C1-6, and R<3> and R<4> represent hydrogen, or R<3> and R<4> together form a group -S-, -NR<8>- or -CH2-, and pharmaceutically acceptable derivatives thereof. Processes for their production and pharmaceutical compositions and methods of treatment involving their use are also described.
Patent IE-904013-A1 (IE)
Title: Benzoxazine derivatives, their preparation, and¹pharmaceutical compositions containing them
IPC: A61K31/538
Filed: 1990-11-07
Abstract: A novel benzoxazine derivative of the formula (I): and a pharmaceutically acceptable salt thereof which are useful as potassium channel activating agents are disclosed.
Patent IE-920653-A1 (IE)
Title: Toothbrush having handle jointed to brush head by¹non-pinching flexible twin beam structure
Inventor: DRIKSING ROBERT STANLEY
IPC: A46B5/00
Filed: 1992-02-28
Abstract: A toothbrush employing a non-pinching resilient twin beam structure to connect the brush handle to the brush head, the twin beam structure having one beam which is wider in cross-sectional width than the other beam in order to prevent soft oral tissue from entering the opening formed between the beams and being pinched between by the interior surfaces of the beams during deformation of the twin beam structure.
Patent IE-922082-A1 (IE)
Title: Cyclosporin compositions for oral administration
Inventor: MEINZER ARMIN
IPC: A61K47/44
Filed: 1992-07-01
Abstract: Pharmaceutical compositions comprising a cyclosporin in a novel galenic formulations for oral administration. The compositions typically comprise a cyclosporin, 1,2-propylene glycol, a mixed mono-, di- and tri-glyceride and a hydrophilic surfactant. Further a refined glycerol-transesterified corn oil is provided representing a mixed mono-, di- and tri-glyceride suitable for the novel formulation. Dosage forms include in particular oral dosage forms.
Patent IE-960376-A1 (IE)
Title: Device for transdermal electrotransport delivery of fentanyl¹and sufentanil
Inventor: SOUTHAM MARY
IPC: C07D409/06
Filed: 1996-05-28
Abstract: The invention provides an improved electrotransport drug delivery system for analgesic drugs, namely fentanyl and sufentanil. The fentanyl/sufentanil is provided as a water soluble salt (e.g., fentanyl hydrochloride), preferably in a hydrogel formulation, for use in an electrotransport device (10). In accordance with the present invention, a transdermal electrotransport delivered dose of fentanyl/sufentanil is provided which is sufficient to induce analgesia in (e.g., adult) human patients suffering from moderate-to-severe pain associated with major surgical procedures. <Fig. 1>
Patent WO-03085468-A1 (WO)
Title: Datenerfassung- und datenspeichers sowie verfahren zur datenerfassung und -speicherung für präzisionswerkzeuge
Inventor: EDER KURT GUENTER
IPC: G06K19/04
Filed: 2003-04-01
Abstract: Die Erfindung betrifft ein Datenerfassungs- und Datenspeichersystem für Präzisionswerkzeuge (1). Erfindungsgemäss ist ein nichtflüchtiger Datenspeicher (5), welcher in einer Bohrung (4) oder Vertiefung direkt im Präzisionswerkzeug (1) oder der Werkzeughalterung befestigt ist, sowie ein Schreib- und Lesestift (6), welcher zum Speichern bzw. Auslesen von Daten mit dem Datenspeicher (5) in Kontakt bringbar ist, vorgesehen.
Patent AT-522559-A1 (AT)
Title: Verfahren zum Regulieren der Aggregattemperatur beim Herstellen von Beton
Inventor: THOMAS WALLNER DIPL ING (FH)
IPC: B28C5/46
Filed: 2019-04-25
Abstract: Die Temperatur eines Aggregates, enthaltend Wasser, Zement als hydraulisches Bindemittel und Zuschlagsstoff, beispielsweise in Form von Rundkorn oder Flusskies, wird in dem für das Abbinden richtigen Bereich, beispielsweise zwischen 10°c und 15°C, gehalten, indem wenigstens ein Teil des Zuschlagsstoffes vor dem Vermengen mit den übrigen Bestandteilen des Aggregates gekühlt wird und/oder indem wenigstens ein Teil des Zuschlagsstoffes vor dem Vermengen mit den anderen Bestandteilen des Aggregates erwärmt wird, so dass der Zuschlagsstoff vor dem Vermengen mit den anderen Bestandteilen des Aggregates eine von der Temperatur der anderen Bestandteile des Aggregates verschiedene Temperatur hat.
Patent AT-514272-A1 (AT)
Title: Antriebseinheit und Fahrzeug
IPC: B62M6/55
Filed: 2013-06-06
Abstract: Antriebseinheit, insbesondere Antriebsunterstützungseinheit zur Unterstützung der Drehung einer Eingangswelle, umfassend: einen Basiskörper (1), eine drehbar gelagerte Eingangswelle (2), einen drehbar gelagerten Abtriebskörper (3), einen Messgrößenaufnehmer (4) zur Erfassung des zwischen der Eingangswelle (2) und dem Abtriebskörper (3) auftretenden Drehmoments, ein Getriebe (5) mit einem Getriebeeingangskörper (6) und einem Getriebeausgangskörper (7) und einen Drehantrieb (8) mit einem Stator (9) und einem Rotor (10), wobei der Stator (9) mit dem Basiskörper (1), der Rotor (10) mit dem Getriebeeingangskörper (6) und der Getriebeausgangskörper (6) mit dem Abtriebskörper (3) drehverbunden ist, wobei die Eingangswelle (2), der Abtriebskörper (3), der Rotor (10), der Getriebeeingangskörper (6) und der Getriebeausgangskörper (7) koaxial angeordnet sind.
Patent AT-520778-A1 (AT)
Title: Kolbenmaschine
Inventor: ALFRED SPIESBERGER
IPC: F02G1/043
Filed: 2017-12-20
Abstract: Kolbenmaschine (1) zur Umwandlung von Wärme in Arbeit oder zum Heizen oder Kühlen durch Aufwendung von Arbeit mit einer Kammer (10), einem Arbeitskolben (6) und zumindest einem Verdrängerkolben (7, 8), welcher das Arbeitsmedium von einem Bereich (11, 12, 13) der Kammer (10) zu einem weiteren Bereich (11, 12, 13) der Kammer (10) verschiebt, wobei zumindest zwei der Bereiche (11, 12, 13) unterschiedliche Temperaturniveaus aufweisen und der Verdrängerkolben (7, 8) zwischen zwei benachbarten der Bereiche (11, 12, 13) angeordnet ist, dadurch gekennzeichnet, dass in der Kammer (10) zwei Verdrängerkolben (7, 8) angeordnet sind und die Kammer (10) drei Bereiche (11, 12, 13) aufweist.
Patent AT-514667-A1 (AT)
Title: Verfahren zur Unterstopfung eines Gleises
IPC: E01B27/17
Filed: 2013-08-07
Abstract: Bei einem Verfahren zum Unterstopfen eines Gleises, wird dieses vorerst durch Erfassen einer Anzahl von Gleisparameter vermessen. Danach werden die ermittelten Istlagedaten in einem Softwareprogramm ausgewertet und schließlich als Solllagedaten zur Steuerung der Stopfmaschine für eine Opti- mierung der Gleislage verwendet. Dabei werden unabhängig von der Stopf- maschine ermittelte und ausgewertete Solllagedaten mit von der Stopfmaschi- ne während der Gleisunterstopfung ermittelten Istlagedaten hinsichtlich mindestens eines Gleisparameters ortssynchronisiert und zur Steuerung der Stopfmaschine verwendet.
Patent WO-9218268-A1 (WO)
Inventor: SIEGMUND ERWIN
IPC: F27D1/04
Filed: 1992-04-16
Abstract: Auffanggrube zur Aufnahme von Metallschmelze und Ableitung von Kühlwasser. Die Auffanggrube (1) ist mit einer mit Schlackengranulat gebildeten Drainageschicht (5, 6) versehen, wobei die Körner des Schlackengranulats, unter Bewahrung von zwischen diesen Körnern vorliegenden kleinen Kanälen, mit einem Bindemittel untereinander verbunden sind. Die Drainageschichtmasse enthält vorzugsweise auch bei Erhitzung expandierende Kieselsäure. Vorzugsweise ist das Bindemittel der Drainageschichtmasse ein mit Wasser aktivierbares, hitzebeständiges Bindemittel, welches Zement, vorzugsweise Tonerdeschmelzzement, enthält. Das Drainageschichtmaterial hat über lange Zeit eine gute Durchlässigkeit für Wasser und Dampf. Bevorzugt ist die Drainage im Bodenbereich der Auffanggrube (1) aus der aus Schlackengranulat und Bindemittel gebildeten Drainageschicht (5) und tragenden Bodenplatten (8) gebildet, wobei unter den Bodenplatten (8) ein durchgehender Durchlüftungsraum (13) vorgesehen ist und weiter an den Seitenwänden der Auffanggrube Wandplatten (16) angebracht sind und auch zwischen den Wandplatten (16) und der Grubenwand (15) ein durchgehender Durchlüftungsraum (17) gebildet ist.
Patent WO-9930891-A1 (WO)
Inventor: STICHT WALTER
IPC: B29C49/42
Filed: 1998-12-10
Abstract: Disclosed is a conveyor device (1), especially for work pieces (2), i.e. injection molded parts (3), molded parts, deep-drawn parts, comprising work piece holders (5) with at least one work piece locating device (29) that are moved by a drive mechanism in relation to at least one part of a form tool (42). At least one of the work piece holders (5) and/or one of the work piece locating devices (29) can be positioned in at least one form mold (46) and/or in a recess adjacent to the form mold in the form tool (42) or in a part thereof.
Patent WO-0119552-A1 (WO)
Title: Systeme de descente de coulee chauffee destine au moulage sous pression
Inventor: WILSON GRAHAM LOUIS
IPC: B22D17/22
Filed: 2000-08-24
Abstract: L'invention concerne des inserts de moule ainsi que des procédés d'utilisation associés, servant au moulage sous pression élevée dans une chambre chaude et permettant d'éliminer sensiblement les carottes et d'améliorer grandement la fluidité. Les inserts de moule comprennent (i) un insert (130, 258) de corps de descente de coulée chauffée, conçu pour être placé dans le bloc moule fixe (112) d'un ensemble moule et comportant un canal d'injection (136, 260), ainsi que (ii) un insert (132, 266) d'extrémité de descente de coulée refroidie, conçu pour être monté dans le bloc moule mobile (114) de l'ensemble moule. L'insert du corps de la descente de coulée et celui de l'extrémité de la descente de coulée sont montés de manière coaxiale de façon que leur extrémité intérieure corresponde l'une avec l'autre, dans la région de la ligne de séparation (155) du moule, de manière à former conjointement au moins un canal de transition courbe (138, 262; 264) qui relie le canal de la descente de coulée (136, 260) avec au moins un canal de coulée (140, 254, 256) formé le long de la ligne de séparation. La température de l'insert du corps de la descente de coulée et celle de l'insert d'extrémité de la descente de coulée sont régulées de manière qu'un point de congélation se produise dans le canal de transition et que la matière en fusion, présente dans le canal de la descente de coulée, puisse retourner dans la buse d'injection de la machine, à la fin de chaque coulée, de manière à éliminer les carottes.
Patent WO-0181481-A1 (WO)
Title: Revetements inorganiques modifies par des polymeres
Inventor: BARBER ROBERT FREDERICK
IPC: C09D1/08
Filed: 2001-04-04
Abstract: L'invention concerne une composition de revêtement à base de ciment anhydre constituée de 30 à 70 % en poids d'un ciment hydraulique, de 5 à 25 % de particules polymères possédant une Tg inférieure à 25 °C et entre 5 et 50 % de particules diluantes minérales. Le rapport ciment/particules minérales et compris entre 5/1 et 1/1. Lorsqu'on les mélange à l'eau, ces compositions constituent des compositions de revêtement décoratives ou protectrices pouvant être appliquées à plusieurs substrats.
Patent WO-02100751-A1 (WO)
Inventor: WASSELL DAVID IAN
IPC: B66B11/02
Filed: 2001-06-12
Abstract: There is an elevator for conveying passengers or goods between floors of a structure. The elevator includes a well (3, 4) and a cage (12) movable vertically therein on roller arms (13, 14) engaging in corner rails (11) of the well. There is a hydraulic ram (15) for the cage (12) acting from a base of the well so that a weight of the cage (12) is carried at the base and the corner rails (11) and walls of the well are constructed substantially from non weight-bearing components.
Patent WO-0238741-A1 (WO)
Title: Reprogrammation cellulaire
Inventor: VERMA PAUL JOHN
IPC: A61K35/12
Filed: 2001-11-09
Abstract: L'invention concerne un procédé pour reprogrammer des cellules différenciées ou partiellement différenciées en un état moins différencié ou dédifférencié. Ce procédé consiste à obtenir un karyoplaste d'une cellule différenciée ou partiellement différenciée, ainsi qu'une source de cellules multipotentes ou pluripotentes multinuclées, aneuploïdes, euploïdes ou polyploïdes, ou une morula ou des embryons précoces ou des dérivés de ceux-ci, et à placer ledit karyoplaste en contact étroit avec les cellules pluripotentes ou multipotentes, ou une morula ou des embryons précoces ou des dérivés de ceux-ci dans des conditions suffisantes pour permettre au moins une reprogrammation partielle des cellules.
Patent WO-2004022426-A1 (WO)
Title: Reservoir de lutte contre le feu a suspendre sous un aeronef
Inventor: HALL GEOFF
IPC: A62C3/02
Filed: 2003-09-04
Abstract: La présente invention concerne un réservoir de lutte contre le feu (11) à suspendre sous un aéronef au moyen de lignes (15). Ce réservoir, dont le haut (12A) est ouvert, comporte une vanne dans le fond (13). Cette vanne peut se relier à l'aéronef au moyen d'une ligne (16) se manoeuvrant à distance, des lignes à déplacement indépendant (15-16) pouvant utiliser la gravité de l'eau pour favoriser l'ouverture et la fermeture de la vanne. La détection dynamique d'un attribut du réservoir tel que la masse, permet un remplissage ou une décharge du réservoir (11) d'une quantité définie à l'initiative du pilote. L'adjonction d'un retardant chimique peut se faire par entraînement par l'eau de décharge après la vanne.
Patent AU-2001223942-A1 (AU)
Title: Marine lipid composition for feeding aquatic organisms
Inventor: HJALTASON BALDUR
IPC: A23K1/10
Filed: 2001-01-15
Abstract: A composition is for feeding aquacultural prey organisms such as Artemia and rotifiers, comprising a lipid component comprising at least 25 wt % of phospholipids and providing a DHA content of at least 30 wt %. The lipid component is preferably derived from marine organisms such as fishmeal, phytoplankton or zoo plankton biomass. The composition is used for providing prey organisms having a high content of highly-unsaturated fatty acids (HUFAs) suitable for aquaculture of fish including halibut, turbot, bass and crustaceans and molluses.
Patent AU-2001226968-A1 (AU)
Title: Compact reactor with heat exchanger
Inventor: JOHNSTON ANTHONY
IPC: B01J8/02
Filed: 2001-01-24
Abstract: A reactor (1) comprises a plurality of reaction zones (5) divided by heat exchanger panels (2) but in fluid communication via said panels, the said reaction zones being arranged in a spiral configuration whereby the reaction zones form a flow path (7) for reactants that extends between a central part of the reactor and an outer peripheral part thereof.
Patent AU-2001230569-A1 (AU)
Title: Process for cyclizing optically active 4-amino-2-halogenobutyric acids
Inventor: SAKA YASUHIRO
IPC: C07D205/04
Filed: 2001-02-02
Abstract: The invention provides a process for producing optically active azetidine-2-carboxylic acid with good efficiency, expedience, and commercial advantage, which comprises cyclizing an optically active 4-amino-2-halogenobutyric acid in an optical yield of as high as 90% or more. It is a process for producing optically active azetidine-2-carboxylic acid of the general formula (2), in which * denotes an asymmetric carbon atom, which comprises cyclizing an optically active 4-amino-2-halogenobutyric acid of the general formula (1),in which X represents a halogen atom and * denotes an asymmetric carbon atom, in the presence of an oxide of an alkaline earth metal, a hydroxide of an alkaline earth metal excepting barium, or an organic amine. <CHEM>