baber/WOPTO huggingface dataset:
Patent SG-11201900688T-A (SG)
Title: Battery device and battery system
Inventor: KUROKAWA KENYA
IPC: H05K7/20
Filed: 2017-07-26
Abstract: A battery device according to an embodiment includes a casing, a second wall, a plurality of battery modules, a support, a plurality of fixing parts, and a cooling unit. The casing includes a first wall. The battery modules are arranged in an inside of a casing chamber of the casing, and each include a first surface, a second surface, and a first positioner that is arranged on the first surface and includes one of a protrusion and a recess. The support supports the battery modules, and is provided with a plurality of second positioners engaged with a plurality of the first positioners to hold the battery modules. The second positioners each include the other of the protrusion and the recess. The fixing parts are provided on the second surface or a position closer to the second surface than the first surface, and fix the battery modules and the casing to each other. The cooling unit allows a refrigerant to flow between the battery modules.
Patent YU-44321-B (YU)
Title: Process for obtaining a monoclonal antibody
Inventor: KUNG P C S
IPC: C12P1/00
Filed: 1981-01-08
Abstract: Hybrid cell line for production of monoclonal antibody to an antigen found on normal human monocytes and granulocytes. The hybrid is formed by fusing splenocytes from immunized BALB/cJ mice with P3X63Ag8U1 myeloma cells. Diagnostic and therapeutic uses of the monoclonal antibody are also disclosed.
Patent YU-48796-B (YU)
Inventor: BARTH WAYNE E
IPC: A61K31/404
Filed: 1994-01-25
Abstract: Jedinjenje formule: u kojoj R prodstsvlja u kojoj X je 0 ili 1; A je C1-C5 alkilen ili C2-C6 alkenil niz, po potrebi supstituisan sa do dva supstituenta nezavisno odabranih od C1-C7 alkil ili C3-C7 cikloalkil; ili (CH2)nO(CH2)m, gde metilen grupe mogu po potrebi biti supstituisane sa do dva supstituenta nezivisno odabrana od C1-C7 alkil ili C3-C7 cikloalkil; ili C3-C7 cikloalkil ili cikloalkenil grupa po potrebi supstituisano sa do dve C1-C3alkil grupe; ili 4-7 clana hetero-aliciklicna grupa koja sadrzi O, S ili NR6 vezu, ili fenilen grupa po potrebi supstituisana sa do dva supstituenta nezavisno odabrana od C1-C3 alkil, C1-C3alkiloksi, halogen ili CF3; B je C2-C6alkenilfenil, 2, 3 ili 4-piridil, 2, 3 ili 4-piperidinil, 2 ili 3-pirolidinil, OCH2CO2R1 ili OCH2CONR2R3; R1 je H, C1-C8 alkil, C3-C7 cikloalkil, fenil (C1-C4) alkil, (CH2)pCO2R2, ili (CH2)pCONR2R3, (CH2)pSi(CH3)2; ili R1 moze obrazovati sa A 5, 6 ili 7-mo clani laktonski prsten po potrebi supstituisan sa C1-C3 alkil grupom; R2 i R3 su nezavisno H, C1-C7alkil, C3-C7 cikloalkil, fenil (C1-C4) alkil; ili R2 ili R3, kada su uzeti zajedno sa vezanim azotom, mogu predstavljati pirolidin, piperidin, morfolin ili homopiperidin grupu po potrebi supstituisan sa do dve C1-C3 grupe; ili R2 ili R3 mogu obrazovati sa A, 5,6 ili 7-mo clani laktamski prsten, po potrebi supstituisan sa do dve C1-C3 alkil grupe; R4 i R5 su nezavisno H, C1-C7 alkil, C3-C7cikloalkil, fenil (C1-C4)alkil, (CH2)pCO2R2, (CH2)pCONR2R3, (CH2)pNR7R8, (CH2)pOR6 ili (CH2)pSR6; ili R4 i R5 kada su uzeti zajedno predstavljaju C3-C7cikloalkil prsten, po potrebi supstituisan sa do dve C1-C3alkil grupe; R6 je H, C1-C6alkil, (CH2)pCOOR2, C3-C7cikloalkil po potrebi supstituisan sa do dve C1-C6alkil grupe, fenil (C1-C4)alkil po potrebi supstituisan na fenil prstenu sa do dva supstituenta nezavisno odabrana od C1-C3alkil, C1-C3alkiloksi, halogen ili CF3, COR2, CONR2R3, ili fenil grupa po potrebi supstituisana sa dva supstituenta nezivisno odabrana od C1-C3alkil, C1-C3alkiloksi, halogen ili CF3; ili kada je uzet sa R4 i vezan kiseonik, moze predstavljati oksetan, tetrahidrofuran, tetrahidropiran ili oksepanski prsten po potrebi supstituisan sa do dve C1-C3alkil grupe; R7 i R8 su nezavisno H, C1-C6alkil, C3-C7cikloalkil, fenil (C1-C4)alkil, COR2, COOR2; ili nezavisno C2-C7 alkanoil, C4-C8 cikloalkanoil, po potrebi supstituisan sa do dva supstituenta nezivisno odabrana od C1-C6alkil, C3-C7cikloalkil, fenil(C1-C4)alkil, C3-C7razgranat alkil, ili R7 i R8 kada su uzeti zajedno sa vezanim azotom mogu predstavljati pirolidin, piperidin ili homopiperidin grupu po potrebi supstituisanu sa do dva supstituenta nezavisno odabrana od C1-C6alkil, C3-C7cikloalkil, C3-C7 razgranat alkil, ili okso, R9 predstavlja H ili metil, R10, R11, R12 i R13 su nezavisno odabrani od C1-C4alkil i halogena, m i n su nezavisno 0, 1 ili 2 gde ili m ili n moraju biti najmanje 1; i p je 1 do 3; i pod uslovom da kada R predstavlja strukturu formule II, a x je O, A mora biti gru
Patent AT-406568-B (AT)
Inventor: THOENIG HANNES ING
IPC: B60D5/00
Filed: 1998-02-24
Granted: 2000-06-26
Abstract: The device has carriers (10) for a connecting bridge (1) of elastic material with cast-in cross struts (3). The bridge is supported sliding on two unconnected carriers, which each project from one of the vehicle chassis (7). The undersides of the cross struts are free, and have a slide coating (4). Between the struts the bridge has low-thickness expansion areas (8). It also has connection elements (5) extending parallel to the cross struts.
Patent AT-402488-B (AT)
Title: Joining device between two objects, especially two flat objects
IPC: B31F5/00
Filed: 1994-03-03
Granted: 1997-05-26
Abstract: The invention relates to a joining device between two objects, especially two flat objects, in which at least one object comprises an upper layer and/or a lower layer and wave peaks 2 or elevations protruding from these. At least the upper layer has webs 3 arranged on the wave peaks 2 or the elevations and connected to these. These webs 3 extend in the direction of the longitudinal axis of the wave peaks 2 or the elevations and project laterally, transversely with respect to this longitudinal axis, beyond the connecting line with the wave peaks 2 or the elevations. This part of the webs 3 which project beyond the connecting line forms a latching projection, the latching projections of the first object engaging behind the latching projections of the further object. <IMAGE>
Patent AT-399414-B (AT)
Title: Distance measuring device for motor vehicles
Inventor: LISKA FRIEDRICH ING
IPC: G01S17/931
Filed: 1989-03-21
Granted: 1995-05-26
Abstract: A distance safety system and distance measuring system for motor vehicles is assembled from 4 transceiver units SE in the region of the corners of the motor vehicle. The transceiver units SE emit a measuring beam with infrared or ultrasonic waves, and are connected to a microcomputer C, which uses the signal propagation time to calculate the distance to motor vehicles or objects located at the front and rear. The distance is output via a distance display AA in metres for the distance safety system, and in centimetres for the distance measuring system. Moreover, a warning device W sounds an optical and acoustic signal when a safety distance is undershot. The latter is calculated as a braking and reaction path by the microcomputer C with the aid of a tachometer generator TG. An additional input device ZV automatically or manually takes account of the condition of the roadway. A signalling device SV can be used to warn a following vehicle when the safety distance is too small. <IMAGE>
Patent HU-190225-B (HU)
Title: Method for early weaning new-born piglets without stress effect
Inventor: ANDREKA PAL
IPC: A23K1/00
Filed: 1984-01-24
Abstract: New-born piglets can be weaned early without causing undue stress by introducing into the digestive tract of the piglets pref. on the 4-5 day through addition to the feed, live liophilised non-homolytic and non-proteolytic, homogermentative L-lactic-acid producing bacteria, in order to increase the acid prodn. in the digestive tract. Protected strains of Streptococcus faccium are suitable for this purpose. Energy supplements like milk powder, fructose or glucose, nutritional elements and starch are added to ensure the rapid progapation of the bateria in the digestive tract.
Patent HU-204035-B (HU)
Inventor: VARFALVI FERENC
IPC: C07D211/12
Filed: 1986-01-29
Abstract: A találmány tárgya eljárás az (I) általános képletű 4-hidroxi-piperidinek - a képletben R1, R2, R3, R4 és R5 egymástól függetlenül hidrogénatomot vagy 1-3 szénatomos alkilcsoportot jelent - előállítására a (Π) általános képletű 4-oxo-piperidinek - a képletben R1, R2, R3, R4 és RJ jelentése a fenti - redukciójával. A találmány szerint a (II) általános képletű vegyületeket 0,34-1 mólekvivalens alumínium-izopropiláttal redukálják, és a'redukciót 60 °C-nál magasabb hőmérsékleten, aromás szénhidrogén-oldószerben végzik. HU 204 035 B A leírás terjedelme: 4 oldal (ezen belül 1 ábra)
Patent HU-202078-B (HU)
Title: Method for producing cheese powder usable for human and foddering purpose
Inventor: MAROTI JOZSEF
IPC: A23C19/02
Filed: 1988-02-29
Abstract: For the prepn. of cheese powder suitable both for human and animal consumption, an insoluble para-casein gel intermediate suspn. is used. This is obtd. by processing cheeses, including sheep's-cheese. The fat content of the suspn. is adjusted below 30 wt.% by the addn. of skimmed milk or whey powder. - Viscosity of suspn. is adjusted with water, at 80-85 deg.C to 2.5-3.0 kPa.s. Following this, 0.3-0.8% of heat stabilizing mixt. of phosphates is added, together, as in this case, with colours and flavours. The homogenized mix is spray-dried at 175-195 deg.C entry and 80-90 deg.C exit temps.
Patent HU-197680-B (HU)
Title: Continuous fluidized-bed process for polymerizing alpha-olefin monomers
Inventor: JENKINS JOHN M
IPC: C08F2/34
Filed: 1983-03-23
Abstract: A process is described for increasing the space time yield of polymer production in a fluidized bed reactor employing an exothermic polymerization reaction by cooling the recycle stream to below its dew point and returning the resultant two-phase fluid stream to the reactor to maintain the fluidized bed at a desired temperature above the dew point of the recycle stream.
Patent MT-P4277-B (MT)
Title: A cushioning device inserted into soles for multiple purposes
Inventor: YAMAMOTO LIMITED
Filed: 2010-01-28
Abstract: The crux of the invention is a special device which is located in the rear part of the shoe sale and comprises at least one cushioning complex formed by a spring and an elastic buffer engaged into a pin, said elastic buffer is the basic element which solves a multitude of troubles generated by the use of springs inside sales. The invented complex generates a real return of energy when the wearer is walking or running and, working into a perfect air chamber located in the heel area, generates a forced air flow internally the shoe.
Patent YU-48965-B (YU)
Inventor: ALEKSANDAR MILOSAVLJEVIC
Filed: 1993-12-07
Abstract: Postupak za primenu pivskog kvasca u proizvodnji pekarskog kvasca, kod koga se prema registrovanom patentu pod brojem 47858, prikupljeni pivski kvasac gornjeg ili donjeg vrenja iz jednodnevne ili visednevne proizvodnje piva u kolicini od oko 1 kg/hl. proizvedenog piva po zavrsenoj fermentaciji pomesan sa talogom od belancevina i gorkih hmeljnih smola i dizanjem testa od 160-200 minuta, prebacuje pumpom u sud za odgorcavanje i pranje sa pripremljenim 0,1% vol.rastvora natrijumkarbonata ili natrijumbikarbonata i mesa u odnosu 1 zapreminski deo kvasca i 3 zapreminska dela reagensa brzinom mesanja 30-35 o/min. u vremenu od 5 minuta, odlezava 10 minuta, a zatim se ili separira ili prva faza sa grubim talogom i treca faza sa tecnim primesama odstranjuje, a druga faza sa pivskim kvascem delimicno odgorcenim prebacuje u drugi sud za odgorcavanje i pranje, dodaje se voda u zapreminskom odnosu kvasac i voda 1:3 mesa u vremenu od oko 5 minuta odstojava 10 minuta i ponovo se razdvajaju faze kao u prvom slucaju i tako se pranje ponavlja 3-4 puta, a zatim se odgorceni i oprani pivski kvasac sa nepromenjenim dizanjem testa od oko 160-200 minuta i 14-15% suvih materija pivskog kvasca mesa u zapreminskom odnosu 1:1,50% sa kvasnim mlekom od pekarskog kvasca sa 14-15% suvih materija pekarskog kvasca i dizanjem testa od 50-60 minuta i dobija mesavina sa dizanjem testa 50-60 minuta i trajnoscu na 35°C za pekarski kvasac, koji se filtrira, oblikuje ili susi do 10% suvih materija za aktivni suvi pekarski kvasac, naznacen ti me, sto se pivska sladovina u kolicini od 70% prvo fermentise aerobno pivskim kvascem gornjeg vrenja roda Saccharomyces, razdvaja od sladovine (mladog piva) separatorom ili decanter-centrifugom, ponovo ide na anaerobnu fermentaciju sa pivskim kvascem donjeg vrenja roda Saccharomyces sa preostalih 30% pivske sladovine u burnoj fazi fermentacije i posle naknadnog vrenja jednim od postupaka za naknadno vrenje i odlezavanje, pivo se razdvaja od kvasca izvlacenjem kvasca iz konusnog dela fermentora. Prijava sadrzi jos 1 nezavisan zahtev.
Patent YU-45966-B (YU)
Inventor: KIRRSTETTER R
IPC: C07D501/57
Filed: 1984-04-27
Abstract: Process for the preparation of cephem compounds of the formula <IMAGE>   wherein R is optionally substituted aminothiazolyl or amino-1,2,4-thiadiazolyl, A is optionally substituted pyridinium, R1 is hydrogen or methoxy and R2 are special aliphatic substituents, by a nucleophilic replacement in the substituent in 3-position in the presence of tri-C1C4-alkyl iodosilane.
Patent AT-394810-B (AT)
IPC: A63C5/056
Filed: 1988-05-05
Granted: 1992-06-25
Abstract: To manufacture a sole member for skis, a strip-shaped material is extruded from polyethylene powder with a mean molar mass (mean weight) in the region between 5.10<5> and 8.10<6>, which is mixed, if appropriate with low-molecular additives, such as oils, paraffins, lubricants, waterproofing agents and the like, using a special extrusion method, e.g. a so-called ram extrusion method. Even before the strip-shaped material is cooled, a flat material, consisting at least mainly of plastic, is laminated onto one of its surface sides, said material being provided on that side, on which it is to be connected to the polyethylene sole material, with a decorative layer, preferably a print which can then be recognised on the sole member through the transparent sole material. This composite material is then cut to the lengths of sole members. The material to be laminated on, which can consist of a nonwoven, e.g. a polyester nonwoven or of a thermoplastic film, such as a melt-extruded polyethylene film, additionally serves as a bonding aid for the sole material. <IMAGE>
Patent AT-385467-B (AT)
Title: Method and apparatus for detachably connecting packaging cartons for beverage cups or the like
Inventor: FRITZ GERHARD ING
IPC: B31B120/30
Filed: 1986-12-02
Granted: 1988-04-11
Abstract: Method for the detachable connecting of parallelepipedal packaging cartons in which flat sleeve-like packaging cartons K are taken from two storage magazines 2, 3 and erected to form parallelepipedal cartons, being brought into contact with one another at a narrow side wall and in each case a top flap D, a bottom flap B and two side flaps S projecting from the narrow side walls perpendicular thereto; the bottom flap is then folded over and the mutually adjacent side flaps S', provided with a tear-off perforation, of the two cartons are jointly folded against the bottom flap of the one carton and the other side flaps are folded against the associated bottom flaps, the top flaps of the cartons then being folded over and adhesively bonded to the bottom flaps and the side flaps. <IMAGE>
Patent DK-157224-B (DK)
Inventor: GERKE DIETER
IPC: H01R4/24
Filed: 1984-03-29
Abstract: The subject matter of the instant invention is formed by U-shaped, solderless, non-screwed and stripping-free, LSA-PLUS terminals (2, 2a) adapted to be tandem-mounted in longitudinal direction in a terminal strip (1). The terminals are disposed at a relative offset of 180 DEG  so that two respective adjacent U-shaped terminals (2, 2a), when viewed from the top, form generally an either X-shape (3) or an O-shape (4).
Patent DK-161471-B (DK)
Inventor: HUGDAHL MATS
IPC: G05D16/18
Filed: 1986-09-16
Abstract: A method and device for regulating pressure fluid cylinders, the fluid being a compressible gas such as air and the cylinder being double-acting and receiving a piston (2). A force transmitting means (12, 20, 24) sensing the load of a cylinder generates a signal corresponding to the size of the load which signal is led to a pressure regulating means (17) adjusting the pressure in the cylinder (1) in dependence of the signal so that this will balance a force acting on the piston rod (3). The load-carrying piston (2) is then positioned in a stationary position relative to the cylinder (1).
Patent DK-162271-B (DK)
Inventor: DANTON JEAN-LOUIS
IPC: B60N2/90
Filed: 1986-09-30
Abstract: New seat support for a public transport vehicle and seat equipped with this support. The invention relates to a seat support for a public transport vehicle, intended to be mounted overhung on a side wall of this vehicle. As seen in section through a vertical plane perpendicular to the sidewall, the framework of this support has a generally C-shaped cross-section. The upper branck of the C is intended to serve as a base for a seat, the lower branch of the C rests on the floor of the vehicle and is fixed to the latter, and the verticle part of the C, which joins the branches together, is designed to bear against the side wall of the vehicle and to be fixed to the latter.
Patent FI-73442-B (FI)
Inventor: REINER ROLAND
IPC: C07D501/36
Filed: 1981-10-06
Granted: 1987-06-30
Abstract: There is presented compounds of the formula    <IMAGE>  I  wherein X represents the 1,2,5,6-tetrahydro-2-methyl-5,6-dioxo-as-triazin-3-yl group or its corresponding tautomeric form, the 2,5-dihydro-6-hydroxy-2-methyl-5-oxo-as-triazin-3-yl group, and the readily hydrolyzable esters, readily hydrolyzable ethers and salts of the compounds and hydrates of the compounds of formula I or of their esters, ethers and salts. Also provided is a method of their manufacture and intermediates therefor as well as corresponding pharmaceutical preparations.
Patent FI-82753-B (FI)
Title: Pump
Inventor: CHILD ROBIN EDWARD
IPC: F04C14/04
Filed: 1985-02-06
Granted: 1990-12-31
Abstract: PCT No. PCT/GB84/00306 Sec. 371 Date Jan. 21, 1985 Sec. 102(e) Date Jan. 21, 1985 PCT Filed Sep. 3, 1984 PCT Pub. No. WO85/01086 PCT Pub. Date Mar. 14, 1985.A gerotor pump is arranged for unidirectional flow irrespective of direction of rotation of the pump by arranging for displacement of the axis of eccentricity of the annulus and rotor upon drive reversal, the annulus being mounted in a carrier 14, FIG. 1, with freedom for movement in a first direction within the carrier, while the carrier itself is pivoted (24) in an outer housing 15, the carrier being free for movement in a second direction within the housing. The effect of normal drive of the rotor is to hold the parts in the FIG. 1 position while pumping continues, but in the event of drive reversal a pressure fluctuation causes the annulus to be displaced within the carrier and then the carrier to be displaced within the housing so as to bring the parts to substantially the mirror image of the FIG. 1 position allowing continued pumping in the same direction from inlet to outlet under reversed drive.
Patent FI-80456-B (FI)
Title: Process for the preparation of therapeutically active new 5-δ-methylenepristinamysines and virginamysines
Inventor: CORBET JEAN-PIERRE
IPC: C07D213/65
Filed: 1987-10-22
Granted: 1990-02-28
Abstract: The invention provides new synergistine derivatives of the formula: <IMAGE>  (I)  in which Y=H or N(CH3)2 and (a) R1 and R2=H and R=pyrrolidin-3-ylthio or piperidin-3-ylthio or piperidin-4-ylthio (optionally substituted by alkyl), or altenatively R=alkylthio substituted by 1 or 2 SO3H radicals or alkylamino or dialkylamino radicals (optionally substituted) or by 1 or 2 piperazino rings (optionally substituted) or morpholino, thiomorpholino, piperidino, pyrrolidin-1-yl, piperidin-2-yl, piperidin-3-yl or piperidin-4-yl or pyrrolidin-2-yl or pyrrolidin-3-yl rings (these last 5 rings being optionally substituted by alkyl), or (b) R1 and R2 form a bond and R=pyrrolidin-3-ylamino, piperidin-3-ylamino or piperidin-4-ylamino, pyrrolidin-3-yloxy, piperidin-3-yloxy or piperidin-4-yloxy, pyrrolidin-3-ylthio, piperidin-3-ylthio or piperidin-4-ylthio (optionally substituted by alkyl), or alternatively R=alkylamino, alkoxy or alkylthio substituted by 1 or 2 SO3H radicals, alkylamino or dialkylamino radicals (optionally substituted) or trialkylammonio or imidazol-4-yl or imidazol-5-yl radicals or by 1 or 2 piperazino rings (optionally substituted by alkyl) or morpholino, thiomorpholino, piperidino, pyrrolidin-1-yl, piperidin-2-yl, piperidin-3-yl or piperidin-4-yl or pyrrolidin-2-yl or pyrrolidin-3-yl rings (these last two rings being optionally substituted by alkyl), and their salts, their preparation, and the pharmaceutical compositions in which they are present. These compounds are useful as anitbacterial agents.
Patent FI-93520-B (FI)
Inventor: HARRISON PHILIP GEOFFREY
IPC: B01D/
Filed: 1989-10-06
Granted: 1995-01-13
Abstract: Vehicle exhaust gas catalyst compositions are disclosed comprising SnO2, CrO3 and CuO, in the proportions SnO2:CrO3 weight ratio 99:1 to 1:99, CuO 0.5 to 100%, preferably 5 to 80%, based on the combined weight of SnO2 and CrO3.
Patent FI-84155-B (FI)
Title: Closing device for trolleys
Inventor: SUOMINEN JARI
IPC: B62B/
Filed: 1989-11-14
Granted: 1991-07-15
Abstract: In the present publication, a closing system for trolleys has been described. The system consists of two arms 5, lying parallel with the side walls of the trolley, and a transverse support 6, which joins their other ends, and hinge joints 4, 7. The system is fastened in the upper section of the trolley in such a way that the arms 5 are hinged in the middle of the side walls. The transverse support 6 is coupled to the arms 5 by means of the hinge joints 7. In the usage position of the trolley, the transverse support is situated by the front wall of the trolley and locks the side walls of the trolley in place. In the storage position, the device has been turned rearwards around the hinge joints. The transverse support is now by the rear wall of the trolley and the hinge joints joining the transverse support 6 and the arms 5 allow the side walls of the trolley to be swung to the sides into the storage position. <IMAGE>
Patent FI-106102-B (FI)
Inventor: SOLLINGER HANS-PETER
IPC: B05C11/04
Filed: 1990-12-05
Granted: 2000-11-30
Abstract: For the purpose of cleaning a doctoring device 1, a groove 3 is provided on the seat of a blade 2, which groove can be filled with fluid. Vibration pulse elements 7 are present which impact the fluid with ultrasonic frequency. As a result, deposits are cleaned from the seat of the blade. 
<IMAGE>
Patent FI-92685-B (FI)
Inventor: HOIKKA TIMO
IPC: D04H1/4209
Filed: 1992-01-02
Granted: 1994-09-15
Abstract: The invention relates to a method for forming the primary web of a mineral fibre mat onto a moving, pervious base by transporting fibres onto the base by means of a stream of air or a corresponding means. In accordance with the invention, the stream of air is adjusted to minimise the pressure difference over the forming base. The invention also relates to an apparatus for the purpose of implementing the method.
Patent FI-106260-B (FI)
Inventor: ISHIHARA SADAO
IPC: A61K31/42
Filed: 1992-03-26
Granted: 2000-12-29
Abstract: Compounds of formula (I):   <CHEM> in which: W represents a sulphur or oxygen atom and X represents a group of formula -N(R<1>)-, or W represents a group of formula -N(R<1>)- and X represents a sulphur or oxygen atom; R<1> is hydrogen, alkyl or aralkyl; R<2> and R<3> are each hydrogen, alkyl, aralkyl, aryl or aromatic heterocyclic; R<4> is hydrogen, alkyl or aralkyl; and A is alkylene which is optionally substituted by carboxy; and pharmaceutically acceptable salts and esters thereof, have a valuable vasodilatory activity.