baber/WOPTO huggingface dataset:
Patent CN-100494312-C (CN)
Inventor: GUOSHENG WANG
IPC: C09K21/02
Filed: 2007-04-30
Granted: 2009-06-03
Abstract: 利用硼镁肥生产纤维状氢氧化镁阻燃剂的方法，涉及一种制取纤维状氢氧化镁的方法，首先将硼镁肥溶解，然后向溶液中加入氧化镁和双氧水进行硫酸中和与亚铁离子氧化并除去铁离子，然后对余液加入碳酸氢铵进行复分解反应。得到重镁水溶液，向溶液中加入表面活性剂和氨水，经过水热处理，过滤洗涤后、干燥得到纤维状氢氧化镁。同时回收得到硫酸胺水溶液和氢氧化铁。本方法提出了一种既经济又环保的纤维状氢氧化镁阻燃剂生产方法，产品质量高，附加值高，同时副产的硫酸铵与碳酸氢氨复合肥用作肥料、氢氧化铁可以作为涂料，能够给企业带来环境保护和经济效益双丰收。整个工艺零排放，不造成二次污染，可达到硼镁矿中硼镁综合利用之目的。
Patent CN-100494695-C (CN)
Inventor: JIANBO LI
IPC: F04D29/38
Filed: 2007-07-20
Granted: 2009-06-03
Abstract: 一种复合材料空腔风扇叶片。属于涵道风扇叶片。该复合材料空腔风扇叶片体由上壳体(1)和下壳体(2)相扣胶合构成，内部为空腔。沿着变距轴线布置一根加强梁(4)，加强梁(4)外端布置铅配重块(3)，璃纤维束(5)沿加强梁(4)外侧缠绕，将配重块(3)与叶根金属接头(6)连接起来。叶片上下壳体(1)和(2)预先模压成型，玻璃纤维束(5)浸胶湿法缠绕，然后整个叶片加温、加压固化成型。该复合材料空腔风扇叶片主体为纸质蜂窝和玻璃纤维布模压成型的上壳体(1)和下壳体(2)，其重量相当轻，整片叶片重心靠近叶端铅配重(3)处，在保证产生足够大离心力，限制其挥舞运动的前提下，其重量要比常规构型旋翼叶片轻。因而更适用于构成多片叶片组成的风扇系统。
Patent CN-100564436-C (CN)
Title: 有机磷活性阻燃环氧树脂固化剂胺基膦酸酯的制备方法
Inventor: CHUNYAN QU
IPC: C08K5/5353
Filed: 2007-07-02
Granted: 2009-12-02
Abstract: 有机磷活性阻燃环氧树脂固化剂胺基膦酸酯的制备方法，它涉及一种有机胺类环氧树脂固化剂的制备方法，本发明解决了目前环氧树脂固化物阻燃效果不理想的问题。本发明制备有机磷活性阻燃环氧树脂固化剂胺基膦酸酯方法的步骤如下：一、乙醇与三氯化磷合成亚磷酸二乙酯；二、丙酮与有机胺在加入脱水剂反应生成酮亚胺；三、步骤一制得的亚磷酸二乙酯与步骤二制得的酮亚胺反应生成胺基膦酸酯。本发明产品的氧指数均在20以上，最高可达34.6。本发明的方法简单，便于操作。
Patent CN-100566280-C (CN)
Title: 一种使Email系统和IM系统互通的方法、系统及设备
Inventor: LINFEI LI
IPC: H04L45/60
Filed: 2007-03-30
Granted: 2009-12-02
Abstract: 本发明涉及通信领域，提供了一种使Email系统和IM系统互通的方法、系统及设备。所述系统包括Email系统和IM系统，所述Email系统包括Email服务器和Email客户端，所述IM系统包括IM服务器和IM客户端，其特征在于，在所述Email系统和IM系统之间包括一个中转服务器；所述中转服务器分别与Email服务器和IM服务器相连，用于在所述Email服务器和IM服务器之间建立通信连接，并基于所述通信连接在Email系统和IM系统之间进行信息转发。本发明通过在Email系统和IM系统之间引入一个中转服务器，由该中转服务器在上述两个系统之间建立通信连接，并基于建立的通信连接进行信息转发，从而使得Email系统和IM系统互通，提高了网络沟通方式的多样性。
Patent CN-100485449-C (CN)
Title: 用于高功率激光系统的大倍率扩束器
Inventor: MEIZHI SUN
IPC: G02B27/09
Filed: 2007-12-07
Granted: 2009-05-06
Abstract: 一种用于高功率激光系统的大倍率扩束器，由同光轴的依次的第一凸透镜、滤波小孔、凹透镜和第二凸透镜构成，所述的滤波小孔位于第一凸透镜的后焦点，上述元件的位置满足下列关系：L 1 ＝(f 0 f 1 β/f 2 )-f 1 ，L 2 ＝f 2 -f 1 +(f 1 f 2 /f 0 β)其中：L 1 是滤波小孔与凹透镜的间距，L 2 是凹透镜与第二凸透镜的间距，f 0 、f 1 和f 2 分别是第一凸透镜、凹透镜和第二凸透镜的焦距，β为扩束器的扩束比。本发明具有结构简单、成本低和调节范围大的优点。
Patent CN-100584484-C (CN)
Inventor: SHUNLI FU
IPC: B22C9/28
Filed: 2008-03-24
Granted: 2010-01-27
Abstract: 本发明提供一种铸造火车车轮的铸模，包括下型铸模和上型铸模，下型铸模包括下石墨型、下顶板和下套箱，上型铸模包括上石墨型、上顶盖和上套箱，下石墨型内侧射制有下砂衬，上石墨型内侧射制有上砂衬，下石墨型内表面和上石墨型内表面形成火车车轮铸件腔的轮辋和踏面表面，下砂衬内表面和上砂衬内表面形成火车车轮铸件腔的幅板和轮毂表面；上型铸模上部设置有冒口，冒口由上砂衬构成，在冒口与火车车轮铸件腔交界部位设置有易割冒口片，易割冒口片中间设置有补缩通道，补缩通道内插设有塞杆组件，塞杆组件下端连接有塞头，塞头对应设置有钢水通道，钢水通道设置于下型铸模上。该铸模生产的车轮轮辋部位组织均匀，无花瓣现象，产品质量好，废品率低。
Patent PT-1166648-E (PT)
Inventor: DUPART PIERRE
IPC: A23L7/143
Filed: 2000-06-30
Abstract: A cooked-extruded grains of rice, reconstitute in the cold, comprise:   (a) rice flour having a degree of gelatinization of 50-95 % (preferably 75-85 %); (b) water; (c) fat; and (d) polypropylene glycol alginate. An Independent claim is included for the production of reconstitute rice grains, by: (i) cooking a mixture of the above components (a) - (d) in a cooker-extruder at 70-150 degrees C, such that the starch is partially gelatinized; and (ii) extruding the mixture in the form of rice grains.
Patent PT-1028199-E (PT)
Inventor: ROZEBOOM ROBERT HENRY
IPC: E03B5/00
Filed: 2000-02-11
Abstract: Method and apparatus for temporarily increasing the transport capacity of the water supply system in case of a calamity, in which despite the occurrence of a calamity an amount of drinking water is to be transported to the service area of a pumping station or transport line which has failed. In case of a calamity, at least one mobile apparatus for raising the pressure in the transport line is temporarily connected to the residual supply system to take over the failing transport function. The apparatus has a transportable housing (6) with a pump (9) coupled to a motor (8), comprising means for setting the pump on two sides into communication with a water transport line (10) via connecting lines (11), and has a capacity sufficient for deployment in a municipal, regional or still larger water supply system. <IMAGE>
Patent PT-1032177-E (PT)
Title: Signal processing apparatus with three layer processing sections
Inventor: KUROSE MITSUKAZU
IPC: H04L47/43
Filed: 2000-02-24
Abstract: A signal processing apparatus is provided which includes upper, intermediate and lower layer processing sections. The lower layer processing section includes a first storage unit having a first memory capacity of a predetermined limited size for transfer data, and storing transfer data. The intermediate layer processing section includes a second storage unit having a second memory capacity larger than the limited size for transfer data, and storing the transfer data. The upper layer processing section transmits the transfer data of a size, which is larger than the first memory capacity and which is equal to or smaller than the second memory capacity, to the intermediate layer processing section. The intermediate layer processing section receives the transfer data transmitted from the upper layer processing section, divides the transfer data into a plurality of divided data each having a size equal to or smaller than the limited size for transfer data, and transmits the divided data to the lower layer processing section. If there is untransmitted divided data upon receiving the response signal, the intermediate layer processing section transmits the untransmitted divided data to the lower layer processing section without transmitting any response signal to the upper layer processing section. <IMAGE>
Patent PT-1156957-E (PT)
Inventor: COX BRIAN ANTHONY
IPC: B62J1/00
Filed: 2000-03-03
Abstract: A saddle for a bicycle, tricycle, exercise cycle or the like has a mounting arrangement which permits the saddle to rock from side to side as a rider pedals the cycle. The rocking motion has an effective centre above the surface of the saddle and the saddle is resiliently biased so as to return to its central position when the cycle is not being ridden.
Patent PT-1268080-E (PT)
Title: Multiway valve for sanitary fixtures
IPC: E03C1/04
Filed: 2001-04-03
Abstract: A multiway valve, which is more particularly intended for a hand-operated shower, contains several individual valves, whose closure members are fitted to a tiltable element. By tilting the tiltable element, which is supported at one point, some of the plurality of individual valves can be opened and optionally also closed. The multiway valve can be housed in a confined space.
Patent PT-1256724-E (PT)
Title: Motor pump unit with delayed starting
Inventor: SYMOENS LOUIS
IPC: F04D15/02
Filed: 2002-04-12
Abstract: Uses a microcontroller with motor (M1) timer inactivation (13/1) which operates when the motor is connected to the voltage supply after the longest elapsed time set by the timer. The device (13/1) also deactivates the timer following at least 4 times in which a timer substractor has not started an intermediate action. Motor/pump group (1) including a pump (P1) driven by an electric motor (M1) controlled by a microcontroller (E1) integrated in the group (1). The microcontroller connects the motor to the voltage supply when it receives a signal from a fluid level sensor (CN1) and disconnects the voltage supply when it receives a signal from a stop sensor (CA1). The microcontroller includes a timer (13/1) designed to delay the application of supply voltage to the motor for a time duration randomly chosen from amongst progressive increasing time steps. A time decrement (D1) is designed to reduce the timed step for each signal received from a liquid level sensor (CN1) during which the voltage supply is not applied to the motor.
Patent PT-1414441-E (PT)
Title: Hepatitis c virus polymerase inhibitors with heterobicyclic structure
Inventor: RANCOURT JEAN
IPC: C07D491/02
Filed: 2002-07-18
Abstract: An isomer, enantiomer, diastereoisomer or tautomer of a compound, represented by formula I:   
wherein:  A  is O, S, N R 1  , or C R 1  , wherein  R 1   is defined herein; 
----- represents either a single or a double bond;  R 2   is selected from: H, halogen,  R 21  , O R 21  , S R 21  , COO R 21  , SO 2 N( R 22  ) 2 , N( R 22  ) 2 , , CON( R  22 ) 2 , 
N R 22  C(O) R 22   or N R 22  C(O)N R 22   wherein  R 21   and each  R 22   is defined herein;  B  is N R 3   or C R 3  , with the proviso that one of  A  or  B  is either C R 1   or C R 3  , 
wherein  R 3   is defined herein;  K  is  N  or C R 4  , wherein  R 4   is defined herein;  L  is  N  or C R 5  , wherein  R 5   has the same definition as  R 4  ;  M  is  N  or C R 7  , wherein  R 7   has the same definition as  R 4  ;  Y 1   is O or S;  Z  is N( R 6a  ) R 6   or O R 6  , wherein  R 6a   is H or alkyl or N R 61 R 62   wherein  R 61   and  R 62   are defined herein; and  R 6   is H, alkyl, cycloalkyl, alkenyl,  Het , alkyl-aryl, alkyl- Het ; 
or  R 6   is   
wherein  R 7   and  R 8   and Q are as defined herein;  Y 2   is O or S;  R 9   is H, (C 1-6  alkyl), (C 3-7 )cycloalkyl or (C 1-6 )alkyl-(C 3-7 )cycloalkyl, aryl,  Het , (C 1-6 )alkyl-aryl or (C 1-6 )alkyl- Het , all of which optionally substituted with  R 90  ; or  R 9   is covalently bonded to either of  R 7   or  R 8   to form a 5- or 6-membered heterocycle; 
a salt or a derivative thereof, as an inhibitor of HCV NS5B polymerase.
Patent PT-1430221-E (PT)
Title: Wind power machine
Inventor: NIKOLAUS THOMAS
IPC: F03D11/00
Filed: 2002-09-19
Abstract: The device has at least one rotor element (5) driven by the wind and a power take-off device (15), especially a generator, connected to the rotor directly or indirectly. The rotor element drives a number of hydraulic pumps (7) either directly or indirectly. A number of pumps can be connected to the rotor via at least one regulator depending on the power, especially depending on the torque or revolution rate, of the rotor element.
Patent PT-1485211-E (PT)
Title: Hot melt coating composition for film transfer and casting process
Inventor: DOVE CLIVE NICHOLAS
IPC: C08L33/14
Filed: 2003-03-05
Abstract: A coating composition that can be used in a process for coating a substrate where in a first step a radiation curable coating composition is applied to the substrate and/or a radiation permeable film. Next, the substrate and the film are pressed together in such a way that the coating composition is sandwiched between them. Thereafter, the coating composition is cured by irradiation through the film to obtain a coated substrate. In a subsequent step, the film is removed from the coated substrate. The coating composition applied to the film and/or the substrate is a hot melt composition comprising 20 to 100 wt. % of a radiation curable resin or mixture of radiation curable resins having a viscosity in the range of from 15 to 10,000 mPa.s in the temperature range of from 40 to 150° C.
Patent PT-1693464-E (PT)
Title: Method for identifying biological species
Inventor: RIVIERE MARCOS ISAMAT
IPC: C12Q1/68
Filed: 2003-10-27
Abstract: The present invention provides a method for identifying species and subspecies in a biological sample through the selective amplification of segments of nucleic acid that code a target region of the cytoplasmatic beta-actin protein, which is present in all the organisms concerned. The method comprises DNA extraction from the sample; amplification of divergent segments of the cytoplasmatic beta-actin gene by PCR or an equivalent technique, using primers of regions with high evolutionary conservation between species and subspecies; and identification of the amplified segment by comparison of its size in base pairs with a pre-established standard of sizes and/or identification of the amplified segment by DNA sequencing and comparison of the resulting sequence with the specific sequence of each species or subspecies present on a computer database.
Patent PT-1922506-E (PT)
Title: Emergency disconnection system
Inventor: DEVEHAT RENAUD LE
IPC: F16L29/00
Filed: 2005-08-09
Abstract: An emergency disconnection system for a fluid loading arm includes two valves, a collar which when closed secures the valves together and which when opened allows the valves to disconnect from each other, and an actuator which includes a single rod which is movable axially over a length of travel. A first jack moves the rod over a first portion of its travel to close the two valves and a second jack moves the rod over a remaining portion of its travel to open the collar. The first and second jacks are independently controllable and positioned substantially coaxially relative to each other.
Patent PT-1879815-E (PT)
Title: Modular endless conveyor belt
Inventor: PETROVIC ZMAJ
IPC: B65G17/08
Filed: 2006-05-12
Abstract: The modular endless conveyor belt includes a structure provided with guides to support the upper run of the belt, a curvilinear guide mechanism and a stabilization mechanism for the belt with relation to the perpendicular in curved trajectory sections. The curvilinear guide mechanism is made up of rollers regularly distributed on the structure, cooperating with lugs arranged on the internal surface of the belt. The lugs include a shoulder for stabilizing the belt. The guide has the form of a rail, arranged below the rollers, cooperating with a shoulder on each lug to counteract the vertical movements to which the belt is subjected as a function of the load being transported. The rail arranged below the rollers has the form of a thin metal sheet in a circular arc and the sheet is housed in a rebate provided in the support structure for the upper run of the belt.
Patent PT-1969979-E (PT)
Title: Hot water supplying device for coffee machines
Inventor: CARBONINI CARLO
IPC: A47J31/46
Filed: 2007-03-13
Abstract: The present invention relates to a hot water supplying device for coffee machines comprising a condensation chamber having at least one output duct for supplying the hot water, a first duct having a first flow rate and arranged for injecting water or steam at a first temperature into the chamber, a second duct having a second flow rate and arranged for injecting water at a second temperature into the chamber. According to the invention, the device further comprises first interception means (21) applied to the first duct (12) and arranged for supplying a first certain amount of water on the basis of the first flow rate by intercepting or not intercepting water injection by respective first time periods of interception or not interception in a certain time interval and second interception means (31) applied to the second duct (13) and arranged for supplying a second amount of water, calculated on the basis of the second flow rate, by intercepting or not intercepting the water injection by respective second time periods of interception or not interception in the certain time interval. The invention relates also to a method for supplying hot water with a device for a coffee machine, to a computer program product loadable in the memory of a computer for realising the method according to the invention and to a coffee machine that comprises the device.
Patent PT-2021054-E (PT)
Title: Injection device
Inventor: CORRIGAN JOSEPH PETER
IPC: A61M5/20
Filed: 2007-05-30
Abstract: An injection device 110 is described having a housing 112 that receives a syringe 114 having a needle 118, wherein the syringe is supported in a syringe carrier 150. The syringe 114 and syringe carrier 150 are biased by a return spring 126 from an extended position in which the needle 118 extends from the housing 112 through an exit aperture 128 to a retracted position in which it does not. A drive spring 130 acts via a drive to advance the syringe 114 from its retracted position to its extended position and discharge its contents through the needle 118 and a return spring 126, brought into play when the drive has reached a nominal return position, restores the syringe 114 to its retracted position. The syringe carrier 150 is designed to restrict rearward movement of the syringe so that the injection device is less prone to failure and damage to is components than prior art devices.
Patent PT-2155942-E (PT)
Title: Cut-resistant gloves
Inventor: DIAS TILAK
IPC: D04B1/14
Filed: 2008-05-27
Abstract: A cut-resistant fabric has at least a fabric section knitted with composite metallic core yarns (22, 24). One or each of some or all courses of the knitted section comprises a first core yarn (22) knitting alternate first stitches and a second core yarn (24) knitting alternate second stitches. Each core yarn (22, 24) extends between its respective alternate stitches floating in the intermediate stitch. This arrangement increases the bulk of the yarn material by unit area in the section, adding considerably to its cut-resistant properties. The fabric has a particular application in gloves for use in the meat-cutting and foam-cutting industries.
Patent PT-2162365-E (PT)
Title: Disposable container for valuable items and machine for filling and closing said container
Inventor: RAZZABONI NICOLETTA
IPC: B65D77/12
Filed: 2008-06-10
Abstract: A disposable container for valuable items that is suitable for being used in a machine for filling and closing the container, the container (16, 116) being suitable for being anchored to supporting elements (22, 23) of the machine so that a filling mouth (21, 121) of the container is positioned for receiving valuable items coming from the machine, such as banknotes, paper items (tickets, cheques, . . . ), coins, plastic chips for casinos, etc. With the edge of the mouth of the container there is associated coupling means (38, 39, 40, 41, 42, 45, 46, 138, 140, 142, 145) that is movable through the action of closing elements of the machine from a first decoupled position, wherein the mouth is open, to a second coupled position, wherein the mouth is closed, said coupling means being suitable for making an irreversible closure when it is taken to the second coupling position.
Patent PT-2240417-E (PT)
Title: Method for heating a low-nox glass furnace having high heat transfer
Inventor: ROUCHY PATRICE
IPC: C03B5/235
Filed: 2009-02-02
Abstract: A method of heating molten glass using a furnace including side walls including transverse burners and fitted with regenerators. At least one transverse burner is supplied with oxidant including less than 30 vol % oxygen and with fuel such that the ratio of the impulse of the oxidant to the impulse of the fuel ranges from 5 to 13. This method of operation provides excellent heat transfer to the glass and creates little pollution.
Patent PT-763115-E (PT)
Inventor: XU FENG
IPC: A61K8/66
Filed: 1995-05-31
Abstract: The present invention relates to isolated nucleic acid constructs containing a sequence encoding a Scytalidium laccase, and the laccase proteins encoded thereby.
Patent PT-784476-E (PT)
Inventor: LODER CARI
IPC: A61K31/198
Filed: 1995-10-05
Abstract: Method for treating multiple sclerosis or encephalomyelitis by administering to a patient a combination of a tricyclic antidepressant drug and tyrosine or phenylalanine or both.
Patent PT-742318-E (PT)
IPC: E01B19/00
Filed: 1996-05-09
Abstract: In track systems for rail vehicles, air-borne noise is reduced by an arrangement of packing (6) of loose material in a suitable casing (8) positioned between and/or at the sides of the rails (5) and on and/or in front of the free surfaces and side faces of the supporting structure (3,4) outside the vehicle profile (7). Pref. the casing comprises a mesh container or basket of rigid dimensions, with mesh apertures small enough to prevent material escaping. It pref. consists of corrosion-resistant plastic, e.g. of polyethylene, polypropylene, polyamide, polycarbonate, polyester, polyacrylic or mixtures of these, or of glass fibres or plastic-coated glass fibres.   Also claimed is a method for preparing and placing of the packed material. Effective noise redn. by method capable of automation.
Patent PT-890072-E (PT)
Inventor: SCHMITTER EDWARD P
IPC: F41A3/66
Filed: 1997-03-20
Abstract: The present invention is a handgun having a polymeric frame with metallic rails that are inserted within the frame after the frame has been formed by a molding process. The rails are inserted into recesses formed in a channel within the frame, before the frame has completely cooled and contracted. The rails comprise a pair of front rails and a pair of rear rails. The rear pair of rails are positioned within rear recesses and held in place by the sear block. The front pair of rails are positioned within front recesses and held in place by a plurality of metallic parts. The parts include a horseshoe, an unlock block, and a spreader block that are positioned between and matingly engage the front rails, thus securing them within their respective recesses.
Patent PT-952822-E (PT)
Inventor: ILLUM LISBETH
IPC: A61K9/16
Filed: 1998-01-14
Abstract: A drug delivery composition for nasal administration is provided which comprises the antiviral agent ICAM-1 and a bioadhesive material. The bioadhesive material may be a chitosan solution, a liquid formulation comprising a polymeric material or a plurality of bioadhesive microspheres. The polymeric material is preferably gellan gum or alginate. The microspheres may comprise starch, chitosan, hyaluronic acid, or gelatin.
Patent PT-968192-E (PT)
Inventor: VOLODARSKY LEONID B
IPC: C07D239/06
Filed: 1998-03-02
Abstract: The present invention is directed to substituted tetrahydropyrimidine derivatives of the general formula   <IMAGE>   wherein R1, R2, R3, R4, R5, R6 and R7, which may be the same or different, are hydrogen or alkyl aryl, cycloalkyl, alkaryl, aralkyl or heterocyclic, or substituted derivative thereof, R6 or R7 can additionally be -OH or -NR8 wherein R8 is hydrogen, alkyl, aryl, cycloalkyl, alkaryl, aralkyl or heterocyclic, or substituted derivative thereof, or R6 and R7 together can be =O or =NOH, and any two R groups on the same or adjacent carbon atoms can be joined in a cyclic configuration, and X is oxyl or hydroxy, it being provided that at least one of R2 and R3 and at least one of R4 and R5 are other than hydrogen.
Patent PT-990220-E (PT)
Inventor: FISCHER GERHARD
IPC: G06K19/04
Filed: 1998-04-15
Abstract: A calling card which can be inserted into a conventional CD drive and read. The calling card is centered in a CD drive. Thus, the calling card becomes a calling card CD with a printed upper side, which can be visually detected by an eye, and an underside on which data can be recorded and read by a computer.
Patent SG-23594-G (SG)
Title: Process for the emission-free drying of a substance in a drying drum.
Inventor: KUNZ WERNER
IPC: F26B21/04
Filed: 1994-02-08
Abstract: The process for low-emission drying of a substance in a drum-type drying installation is suitable in particular for sewage sludge, fish meal and sludges from starch factories, soap factories and paper mills, which substances are preferably to be converted into granules. The process is likewise very suitable for drying biomass products such as wood chips, grass, sugar beet chips and the like, since the emissions are very greatly reduced by means of this process. The drying process is carried out in such a way that no unpleasant odors and dusts are emitted to the outside, because the actual drying circulation is closed. Fossil fuels are used as the heat source for the burner for heating this air stream.
Patent SG-54490-G (SG)
Title: Novel benzothiazepine derivatives,processes for preparing the same and pharmaceutical compositions
IPC: C07D281/10
Filed: 1990-07-13
Abstract: Novel benzothiazepine derivatives of the formula 
<CHEM>
 wherein R<1> and R<2> are each lower alkyl, R<3> is hydrogen, lower alkyl or hydroxy-lower alkyl, R<4> is hydrogen, halogen, lower alkyl, lower alkoxy, lower alkylthio or nitro, and A is lower alkylene and processes for preparing same are disclosed. Said compounds (I) and pharmaceutically acceptable acid addition salts thereof in form of pharmaceutical compositions are useful as cerebral or coronary vasodilators.