baber/WOPTO huggingface dataset:
Patent EP-0299696-A3 (EP)
IPC: G05D23/13
Filed: 1988-07-11
Abstract: A system is disclosed for independently attaining, 
monitoring, and dispensing a fluid mix or a plurality of 
fluid mixes of a desired temperature, flow rate, and 
volume, said fluid mixes each comprising of two separate 
mixable fluids as they enter the system. The system 
comprises of any number of fluid mixing apparatuses 
including their drive means, sensors, one microprocessor 
configuration, and an appropriate number of user command 
and system status feedback means. In one embodiment, as 
disclosed herein, a plurality of system users can 
independently and even simultaneously instruct, using a 
variety of means, a single microprocessor configuration 
to provide their desired fluid mixes. The microprocessor 
configuration compares the instructions with the system 
status data provided by the sensors and its own 
calculations. Whenever the data differs from the 
instructions, it causes the fluid mixing apparatuses' 
drive means to operate in such a way as to provide mixes 
which match the users' commands. Users are provided with 
system status information all the while.
Patent EP-0319146-A3 (EP)
IPC: C03C10/02
Filed: 1988-11-08
Abstract: This invention is directed to the preparation of glass-­
ceramic materials especially suitable for use in multilayer 
substrates for integrated circuit packages. The inventive 
glass-ceramics are derived from thermally crystallizable 
glasses which, in the form of frit, are capable of being 
sintered into an integral body at temperatures below 1000°C 
and essentially concurrently crystallized  in situ  to yield 
BPO₄ as the predominant crystal phase. The inventive glass-­
ceramics exhibit a linear coefficient of thermal expansion 
between about 30-45 x 10⁻⁷/°C, a dielectric constant less 
than 5, and consist essentially, in weight percent, of 
10-25% B₂O₃, 20-40% P₂O₅, and >50-65% SiO₂.
Patent EP-0335195-A3 (EP)
Title: Silica sol containing elongated-shaped particles and method for preparing the same
IPC: C01B33/148
Filed: 1989-03-16
Abstract: A stable silica sol has an SiO₂ concentration of 40 % 
or less. The sol contains amorphous colloidal silica particles 
each having a particle size D₁ of from 40 to 500 mµ, as measured 
by the dynamic light-scattering method, the particles being 
dispersed in a liquid medium. Each particle has a shape 
elongated in only one plane and has a uniform thickness of from 
5 to 40 mµ along the elongation. The degree of particle 
elongation is from 5 to 30 in terms of size ratio D₁/D², where the 
particle size, D₂ mµ, is calculated from the formula D₂ = 2720/S 
where S is a specific surface area (m₂/g) of the particles to be 
measured by the nitrogen gas-adsorbing method (BET). Also 
disclosed is a colloidal silica sol having silica particles and 
a method for preparing the sol, each particle having a thickness 
of from 5 to 20 mµ and having a diameter of from 40 to 300 mµ. 
Further disclosed is a silica sol having silica particles and a 
method for preparing the sol, each particles having a thickness 
of from 5 to 40 mµ and a diameter of from 40 to 500 mµ and a ratio 
D₁/D₂ of from 5 to 30.
Patent EP-0334366-A3 (EP)
IPC: B65H19/12
Filed: 1989-03-23
Abstract: A low-profile, automatically guided vehicle (12) is 
provided with a vertically raisable cradle (24) which can carry a 
roll (10) either in a bilge position (10b) or an upright position (10u). 
The vehicle is used in a roll-handling system which enables the 
vehicle to pass beneath the spaced, parallel arms of a 
storage rack (16) that can be holding a roll either in the upright 
or bilge position. The vehicle can pass beneath a set of 
rolls on the storage racks so that passage of the vehicle 
either for depositing a paper roll or lifting a paper roll 
from the storage rack can be in a single, common direction. 
A transfer table is provided which has articulated arms (70) that 
can be vertically raised. The arms can be moved lengthwise 
to the direction of the lengthwise axis of the roll in a 
bilge position, the arms can be raised vertically, or the 
arms can be carried moved to the lengthwise axis of the roll 
on the transfer table. A method is disclosed for handling 
rolls in an advantageous first-in, first-out method wherein a 
roll at one end of a row of rolls can be accessed by passing 
a vehicle beneath all other rolls in that row.
Patent EP-0340683-A3 (EP)
Title: Camera with color separation shutter
IPC: H04N9/097
Filed: 1989-04-28
Abstract: A color component separation camera is provided 
with a shutter blade mechanism in which the different 
color exposing filters are integrated to provide a quick 
series of succeeding color component exposure intervals. 
The blade mechanism comprises two overlapping 
independently driven lightweight shutter blade elements 
comprising filtered and unfiltered apertures arranged in 
side-by-side relation for selective movement into the 
image light path in a manner whereby a plurality of 
different color component separation exposure intervals 
may be implemented in rapid succession.
Patent EP-0345597-A3 (EP)
IPC: C07F9/40
Filed: 1989-05-29
Abstract: Die Erfindung betrifft Neue O-Halogencyclobutyl-S-­
(alkyl)-(di) thiophosphon(r)-säureester der Formel (I) 
  
gefunden, in welcher  
X für Sauerstoff oder Schwefel steht,  
p für null, eins oder zwei steht,  
m für null, eins oder zwei steht,  
n für 2, 3 oder 4 steht,  
R¹ für Alkyl, für gegebenenfalls durch Sauerstoff oder 
Schwefel unterbrochenes Alkoxy, welches durch Halo­
gen substituiert sein kann, Alkenyloxy, Alkinyloxy, 
 
 
für Heterocyclyl-alkoxy oder für gegebenenfalls 
durch Alkyl und/oder Halogen substituiertes Cyclo­
alkoxy steht,  
welche als Schädlingsbekämpfungsmittel verwendet werden 
können.
Patent EP-0345760-A3 (EP)
IPC: H01L23/495
Filed: 1989-06-07
Abstract: In order to anchor a carrying metal slice (1) of 
a semiconductor device to a case being formed by 
pressure-injection of resin, the slice (1), 
which carries a semiconductor chip (3) comprises 
at least one part (2) that is depressed in 
relation to the surface on which the chip (3) is 
mounted, wherein said depressed part (2) has at 
least one hole. Plastic of the case extends through 
the hole to the interior of the volume delimited by 
the depressed part and by the chip (3) carried by 
the metal slice (1).
Patent EP-0356847-A3 (EP)
IPC: C08G18/67
Filed: 1989-08-19
Abstract: Verbesserte Allylurethane sind erhältlich durch Um­
setzung eines Polyglykolgemisches mit einer Hydroxy­
allylverbindung und einem Isocyanat mit wenigstens zwei 
NCO-Gruppen.
Patent EP-0382891-A3 (EP)
Title: Method of manufacturing a fibre-reinforced extruded rubber article
IPC: B29C48/06
Filed: 1989-09-26
Abstract: A method of producing a thread-reinforced, extruded rubber body by a shear head wherein the threads are continuously supplied, embedded in a rubber mixture which is in a continuous forward motion and fixed in the rubber body by vulcanizing the rubber mixture. The method is such that the reinforcing threads are helically twisted in the finished rubber body. The rubber body is thus reinforced not only in longitudinal direction but also additionally in circumferential direction.
Patent EP-0374639-A3 (EP)
IPC: H02G3/04
Filed: 1989-12-08
Abstract: Rohraggregat für die Aufnahme von Kabeln aus vier stranggepreßten 
Kunststoffrohren, die durch angeformte flexible Abstandsstege vereinigt 
und zu einem in bezug auf zwei Achsen symmetrischen Rohrbündel zusam­
menlegbar sind. Die Kunststoffrohre weisen einen achteckigen Außenquer­
schnitt auf. Die Abstandsstege sind so eingerichtet, daß im Rohrbündel 
jeweils zwei gegenüberliegende Flächen des achteckigen Querschnitts als 
Kontaktflächen aneinanderliegen. Ein Kernhohlraum bleibt frei.
Patent EP-0380820-A3 (EP)
Title: Method and relevant facility for the processing of an alimentary product with a liquid content
IPC: A23L19/00
Filed: 1989-04-07
Abstract: A method and a relevant facility for the treatment 
of an alimentary product with a liquid content calls for 
a step in which the whole alimentary product is 
disintegrated and in which the disintegrated alimentary 
product is for the first time at such a temperature as to 
undergo an evaporation, and calls for subsequent steps of 
processing of the disintegrated alimentary product; the 
evaporate resulting from the evaporation is condensed and 
collected, with the flavouring substances contained in 
the evaporate being recovered.
Patent EP-0334499-A3 (EP)
Title: A prepreg sheet
IPC: H05K1/03
Filed: 1989-03-02
Abstract: A prepreg sheet (1) is provided comprising a dielectric 
insulating substrate (3), a first semi-hardened 
adhesive layer (4) impregnating the substrate (3), and 
a second semi-hardened adhesive layer (5) applied to 
the surface of the first semi-hardened adhesive layer 
(4). Preferably the adhesive of the first semi-­
hardened adhesive layer, prior to hardening, has a 
higher viscosity than the adhesive of the second semi-­
hardened adhesive layer, prior to hardening.
Patent EP-0347031-A3 (EP)
Title: Adjusting apparatus for adjusting sound volume or sound quality
IPC: H03G3/02
Filed: 1989-04-20
Abstract: The apparatus for adjusting sound 
volume or sound quality of a signal reproduced from a 
music source (1) has an electronic volume section (2) 
with a group (23) of analog switches. The apparatus 
includes a signal generating means (112) which 
generates a signal for switching the group of analog 
switches at the approximately zero-cross point of the 
reproduced signal of the music source, thereby preventing any 
discontinuous portion in the output signal.
Patent EP-0341923-A3 (EP)
IPC: C04B35/589
Filed: 1989-05-05
Abstract: Low density silicon nitride ceramics having 
improved bending and specific strengths over known silicon 
nitride ceramics derived from silicon nitride powder and 
polysilazane precursors are prepared by (A) intimately 
mixing 50-85% by weight of silicon nitride powder with 
15-50% by weight of a preceramic polysilazane binder, (B) 
pulverizing the mixture to form particles having a par­
ticle size smaller than 105 micrometers, (C) separating 
from those particles any particles having a particle size 
larger than about 105 micrometers, (D) molding the resul­
tant composition having a particle size not larger than 
about 105 micrometers, and (E) pyrolyzing the molded 
composition in an inert atmosphere to a temperature of 
1200-1450°C.; said preceramic binder being at least one 
polysilazane prepared by reacting an organodihalosilane 
with ammonia, treating the ammonolysis product with a 
basic catalyst which is capable of deprotonating an NH 
group that is adjacent to an SiH group, and quenching the 
resultant product with an electrophilic quenching reagent.
Patent EP-0386372-A3 (EP)
Title: Threaded pipe joint having improved seal ring entrapment
IPC: F16L15/04
Filed: 1989-11-20
Abstract: The box end (12) of a threaded joint has an interior 
profile of an inwardly tapered threaded section, followed by a smooth 
sealing surface parallel to the longitudinal axis of the threaded 
joint, followed by an increased diameter seal ring groove, followed by 
an inwardly tapered smooth sealing surface. The pin end (11) of the 
joint has an external torque shoulder (16), followed by an inwardly 
tapered threaded section, followed by a reduced diameter pipe dope 
reservoir, followed by an extrusion hump (13) used to extrude a 
deformable seal ring used in the seal ring groove, followed by an 
inwardly tapered smooth sealing surface. When the threaded joint is 
fully made up, the entrapped seal ring (14) has a primary 
metal-to-metal seal on its one side, formed by the mated smooth, 
tapered surfaces, and a secondary metal-to-metal seal formed by the 
extrusion hump and the surface above the seal ring groove.
Patent EP-0375363-A3 (EP)
IPC: C09J7/02
Filed: 1989-12-19
Abstract: A solventless silicone composition for release 
paper containing a partially branched vinyl 
organopolysiloxane as the base polysiloxane to be cured, 
which may bc applied without the use of organic solvents, 
and which gives a cured film having excellent slip 
properties and releasability without using any slip-­
imparting materials.
Patent EP-0340167-A3 (EP)
IPC: B21D5/02
Filed: 1989-04-18
Abstract: Beim Verfahren zum Biegen eines Werkstückes nach einem gegebe­
nen Biegewinkel wird das Werkstück zunächst nach einem etwas 
grösseren Winkel gebogen als der gegebene Endbiegewinkel, wor­
auf durch eine Entlastung des Biegestempels (5) die Entspannung 
des vorgebogenen Werkstückes (14) erfolgt. Danach wird der Be­
trag der Rückfederung durch Messung des effektiven Biegewinkels 
nach der ersten Biegeoperation ermittelt. Nun wird der Matri­
zenboden (22) derart verstellt, dass bei der nachfolgenden, 
zweiten Biegeoperation ein Biegewinkel resultieren würde, der 
dem gegebenen Endbiegewinkel minus dem Betrag der Rückfederung 
entspricht. Nach der Entlastung des Werkstückes nach der zwei­
ten Biegeoperation wird das Werkstück derart zurückfedern, dass 
es genau den erwünschten Endbiegewinkel besitzt.
Patent EP-0371943-A3 (EP)
Title: System and method for generating programming language translators
IPC: G06F9/44
Filed: 1989-11-27
Abstract: A system for automating a portion of a process of 
writing programming language translators provides a plurality 
of standard objects written in some selected target language. 
This target language is the programming language which is used 
to write the programming language translator, and is independ­
ent of the input language which is to be translated using that 
translator being written. These standard objects include all 
those which are necessary for the lexical scanning and parsing 
portions of the translator, and include simplified abstract 
interface points for user written code to perform semantic 
analysis.
Patent EP-0379086-A3 (EP)
IPC: C08F285/00
Filed: 1990-01-12
Abstract: Emulsionscopolymerisate, erhältlich durch  
A. Emulsionspolymerisation von 5 - 50 Gew-% eines Monomerengemischs aus  
   a₁) 50 - 99,99 Gew.-% Styrol oder dessen kernsubstituierten Derivaten 
(Monomere I)    a₂) 0,01 - 5 Gew.-% eines aliphatischen konjugierten Diens mit bis zu 
6 C-Atomen (Monomere II)    a₃) 0 - 49,99 Gew.-% eines C₁-C₁₂-Alkylesters der Acrylsäure oder der 
Methacrylsäure (Monomere III)    a₄) 0 - 10 Gew-% eines bi- oder polyfunktionellen nicht konjugierten 
Monomeren (Monomere IV)    a₅) 0 - 5 Gew.-% weiterer radikalisch polymerisierbarer Monomere 
(Monomere V)    
wobei sich die Gew-% a₁ - a₅) auf die Gesamtmenge (= 100 %) der in 
Stufe A eingesetzten Monomere beziehen,  
B. anschließende Polymerisation von 15 - 45 Gew.-% eines Monomeren­
gemischs aus 
   b₁) 80 - 99,99 Gew-% eines Acrylsäureesters (Monomere IIIa)    b₂) 0,01 - 10 Gew.-% eines Monomers II    b₃) 0 - 10 Gew-% eines Monomers IV     
wobei sich die Gew.-% b₁) - b₃) auf die Gesamtmenge (= 100 %) in 
Stufe B eingesetzten Monomere beziehen,  
 
 
C. anschließende zweistufige Pfropfpolymerisation mit  
Variante C/1:  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₁) 70 - 100 Gew.-% eines Monomeren I    c₂) 0 - 30 Gew.-% eines Monomeren III    c₃) 0 - 5 Gew.-% eines Monomeren IV     
in der 1. Stufe und  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₄) 70 - 100 Gew.-% eines C₁-C₁₂-Alkylesters der 
Methacrylsäure (III b)    c₅) 0 - 30 Gew.-% eines weiteren Monomeren III    c₆) 0 - 5 Gew.-% eines Monomeren IV in der 2. Stufe     
oder  
Variante C/2:  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₇) 70 - 100 Gew.-% eines Monomeren III b    c₈) 0 - 30 Gew.-% eines weiteren Monomeren III    c₉) 0 - 5 Gew.-% eines Monomeren IV     
in der 1. Stufe und  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₁₀) 70 - 100 Gew.-% eines Monomeren I    c₁₁) 0 - 30 Gew.-% eines Monomeren III    c₁₂) 0 - 5 Gew.-% eines Monomeren IV     
in der 2. Stufe  
oder  
Variante C/3:  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₁₃) 70 - 100 Gew.-% eines Monomeren I    c₁₄) 0 - 30 Gew.-% eines Monomeren III    c₁₅) 0 - 15 Gew.-% eines Monomeren IV     
in der 1. Stufe und  
 
 
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₁₆) 50 - 90 Gew.-% eines Monomeren I    c₁₇) 5 - 40 Gew.-% eines α,β-ungesättigten Nitrils (Monomere VI)    c₁₈) 0 - 30 Gew.-% eines Monomeren III    c₁₉) 0 - 5 Gew.-% eines Monomeren IV     
in der 2. Stufe  
oder  
Variante C/4:  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₂₀) 50 - 90 Gew.-% eines Monomeren I    c₂₁) 5 - 40 Gew.-% eines Monomeren V    c₂₂) 0 - 30 Gew.-% eines Monomeren III    c₂₃) 0 - 5 Gew.-% eines Monomeren IV     
in der 1. Stufe und  
5 - 25 Gew.-% eines Monomerengemischs aus 
   c₂₄) 70 - 100 Gew.-% eines Monomeren I    c₂₅) 0 - 30 Gew.-% eines Monomeren III    c₂₆) 0 - 5 Gew.-% eines Monomeren IV     
in der 2. Stufe,  
wobei sich die Gew.-% C₁) - C₂₆) jeweils auf die Gesamtmenge (= 100 %) 
der in jeder Stufe eingesetzten Monomere beziehen.
Patent EP-0385435-A3 (EP)
Title: Digital signal processing apparatus and method
IPC: G06F15/78
Filed: 1990-02-28
Abstract: A digital signal processing apparatus including at least 
an instruction RAM (3), a data RAM (4) and a computing 
block (6), wherein, according to the present invention, 
a start signal detection device (7) is provided for detecting 
the start signal indicating the leading part of the program 
execute cycle, and at least one instruction cycle of the 
program execute cycle is not used to execute the program 
instructions, but is used to perform setting of an operational 
mode from a microcomputer or rewriting of the coefficient 
RAM (5) or the instruction RAM (3) in the course of digital 
signal processing without interruption of the digital signal 
processing.
Patent EP-0391200-A3 (EP)
IPC: G03F7/039
Filed: 1990-03-26
Abstract: Hochwärmebeständige Reliefstrukturen können dann in einfacher 
und kostengünstiger Weise aus Polybenzoxazol-Vorstufen herge­
stellt werden, ohne daß diese polymerisierbare Gruppen aufwei­
sen bzw. ohne daß photoaktive Komponenten vorhanden sind, wenn 
lösliche Hydroxypolyamide in Form einer Schicht oder Folie auf 
ein Substrat aufgebracht und mittels eines UV-Excimer-Lasers 
mit einer Leistungsdichte > 10⁵ W/cm² pro Puls durch eine Maske 
belichtet werden und dann mit einem wäßrig-alkalischen Ent­
wickler entwickelt und nachfolgend getempert wird.
Patent EP-0393444-A3 (EP)
IPC: G08G1/123
Filed: 1990-04-06
Abstract: Gegenstand der Erfindung sind ein Verfahren und eine Vorrich­
tung zur positionsabhängigen Betätigung mindestens eines Organs 
(4) in einem Fahrzeug (1). Mit einem im Fahrzeug (1) angeord­
neten Detektor (2) wird in der jeweiligen Fahrzeugpositions das 
Auftreten einer für mindestens eine Bestimmungsposition typischen 
Meldung überwacht. Bei Feststellung der Meldung wird das Organ 
(4) aktiviert.
Patent EP-0393708-A3 (EP)
IPC: C12R1/06
Filed: 1990-04-20
Abstract: A process for producing L-ornithine comprises culturing in 
a liquid medium an L-ornithine producing microorganism 
belonging to the genus Brevibacterium, the genus 
Corynebacterium or the genus Arthrobacter having 
auxotrophy for at least one of the compounds arginine or 
citrulline and having resistance to at least one compound 
selected from mycophenolic acid and ornithinol, and 
collecting L-ornithine from the medium.
Patent EP-0416603-A3 (EP)
Title: Quartz-glassfibre fusion-coupler
IPC: G02B6/28
Filed: 1990-09-06
Abstract: A silica-fibre fusion coupler is described which is produced by fusing two glass fibres having a defined radially symmetrical refractive index distribution and drawing in the longitudinal direction. In order for the coupling ratio of the coupler to be independent of polarisation, the relative refractive index difference DELTA  of the cores inside the coupling zone is between 0.04 and 0.2%. <IMAGE>
Patent EP-0386894-A3 (EP)
Title: Focussing an electron beam
IPC: H01J37/04
Filed: 1990-02-14
Abstract: A beam (1) of e.g. an electron microscope is focussed 
on a specimen (4) and secondary electrons (5) generated 
thereby are detected and analysed (6,7,8,9) to generate an 
output signal. That output signal is investigated for one 
magnification or scanning time of the beam (1) over a range 
of focusses to determine the optimum output value for that 
one magnification. This investigation is repeated for 
other magnification to generate a series of optimum output 
values. The optimum of that series is then determined, and 
the electron microscope may then be operated for that 
specimen (4) at the focus corresponding to the optimum of 
the series of optimum values. In this way, automatic 
focussing is provided which permits the optimum focus to be 
determined in dependence on the specmen (4).
Patent EP-0406121-A3 (EP)
IPC: B65D85/48
Filed: 1990-06-29
Abstract: Le dispositif pour supporter et transporter un 
empilement de feuilles de verre (1) comporte une base (2) 
recevant cet empilement par la tranche des feuilles de verre.  
     La base (2) porte deux barres espacées (9) sensiblement 
parallèles à ses bords (10) perpendiculaires à la paroi dorsale 
(4), ces barres (9) étant montées de façon articulée à la base 
(2) pour pouvoir pivoter entre une position dans laquelle elles 
reposent sur la base (2) et une position dans laquelle elles 
s'étendent à une hauteur variable au-dessus de la base (2).  
     Utilisation notamment pour supporter et transporter des 
vitrages pour automobile.
Patent EP-0455423-A3 (EP)
Title: Ortho-lithiation process for the synthesis of 2-substituted 1-(tetrazol-5-yl) benzenes
IPC: C07D257/04
Filed: 1991-04-25
Abstract: A process utilizes the tetrazole functional group to direct lithiation at the ortho position of a phenyltetrazole and generate a nucleophilic aryllithium species which then undergoes reaction with an electrophile to generate a 2-substituted 1-(tetrazol-5-yl)benzene. The process is useful in the production of intermediates in the synthesis of angiotensin II antagonists. This novel process is a more cost effective and versatile route for the large-scale preparation of these key intermediates.
Patent EP-0517323-A3 (EP)
Title: Hearing aid intended for being mounted within the ear canal
IPC: H04R25/00
Filed: 1992-06-02
Abstract: An in-the-ear canal hearing aid comprises a microphone (1), an amplifier (2), an electromechanical transducer (3), for example in the form of a telephone, and an infrared detector (15). The hearing aid further includes an extraction means (12) for extracting the hearing aid from the ear canal. The extraction means (13) is in the form of an optical conductor for conducting infrared radiation. One end (20) of the conductor (13) is mechanically attached to the hearing aid housing (4,6) in a place so that the end (20) of the conductor (13) is optically coupled to the detector (15). As a result, the extraction means (12) has as its second function conducting the infrared radiation to the detector of the hearing aid.   <IMAGE>
Patent EP-0596755-A3 (EP)
Title: Container system.
Inventor: MAXWELL HENRY URQUHART
IPC: B65D88/12
Filed: 1993-11-08
Abstract: A container (10) has dimensions which enable it to be lifted and transported lengthwise by a conventional skip truck (34), while also allowing it to be accommodated crosswise with other containers (10) within a standard ISO container. The container (10) has both means for handling by normal container equipment, such as fork lift slots (26), and means such as lugs (30) for handling by skip truck. <IMAGE>
Patent EP-0668097-A3 (EP)
Title: Filtration and separation apparatus for fluids with filter elements in the form of membrane pads.
Inventor: HEINE WILHELM
IPC: B01D63/08
Filed: 1994-12-08
Abstract: Installation for the cleaning of liquids by reverse osmosis as well as micro-, ultra and nano-filtration. Filter stacks are built up of alternating diaphragm pads and spacer plates. A number of stacks are assembled, in sequence of next to each other, in a tubular housing with an inlet, a filtrate outlet and a dirt outlet.