baber/WOPTO huggingface dataset:
Patent BR-112022020550-A2 (BR)
Title: Métodos de administração de composições de gama-hidroxibutirato com divalproato de sódio
Inventor: JULIEN GRASSOT
IPC: A61P43/00
Filed: 2021-04-15
Abstract: MÉTODOS DE ADMINISTRAÇÃO DE COMPOSIÇÕES DE GAMA-HIDROXIBUTIRATO COM DIVALPROATO DE SÓDIO. A presente invenção refere-se a composições farmacêuticas orais de gama-hidroxibutirato (GHB) adequadas para administração concomitante com uma dose de divalproato de sódio (DVP) sem alterar materialmente a quantidade de dosagem de qualquer fármaco. A invenção também se refere a usos terapêuticos das composições para o tratamento de um ou mais sintomas de narcolepsia.
Patent BR-112022020783-A2 (BR)
Title: Dispositivo de elevação e método para elevar uma pá de turbina eólica
Inventor: BEINAT GAMINDE LARRETA
IPC: F03D13/40
Filed: 2021-04-06
Abstract: DISPOSITIVO DE ELEVAÇÃO E MÉTODO PARA ELEVAR UMA PÁ DE TURBINA EÓLICA. A presente invenção refere-se a dispositivo de elevação (1) para a elevação de uma pá da turbina eólica (100) de uma turbina eólica. Além disso, a presente invenção refere-se a método para elevar uma pá da turbina eólica (100) por meio de tal dispositivo de elevação (1).
Patent BR-112022021321-A2 (BR)
Title: Formas cristalinas do composto de ftalazinona.
Inventor: KUNHEE LEE
IPC: A61K31/502
Filed: 2020-04-24
Abstract: FORMAS CRISTALINAS DO COMPOSTO DE FTALAZINONA. O presente relatório descritivo apresenta formas cristalinas de 4-[3-(3-[(ciclopropilamino)metil]azetidina-1-carbonil)-4-fluorobenzil]ftalazina-1(2H)-ona hidrocloreto, seus métodos de preparação e suas composições farmacêuticas.
Patent BR-112022023199-A2 (BR)
Title: Certas composições químicas e métodos de uso das mesmas
Inventor: ANDREI W KONRADI
IPC: C07D405/14
Filed: 2021-05-14
Abstract: CERTAS COMPOSIÇÕES QUÍMICAS E MÉTODOS DE USO DAS MESMAS. A presente divulgação fornece inibidores de CDK9. Também são fornecidos métodos de tratamento de uma doença ou distúrbio compreendendo a administração a um sujeito com necessidade de tratamento de um dos inibidores de CDK9 divulgados neste documento. Em algumas modalidades, a doença ou distúrbio a ser tratado é câncer. Em algumas modalidades, a doença ou distúrbio é câncer de fígado.
Patent BR-112022024075-A2 (BR)
Title: Mistura de biocimentação para controle de poeira e pedidos relacionados
Inventor: MARTIN SPITZNAGEL
IPC: C09K3/22
Filed: 2021-05-20
Abstract: MISTURA DE BIOCIMENTAÇÃO PARA CONTROLE DE POEIRA E PEDIDOS RELACIONADOS A presente invenção refere-se principalmente ao uso de uma mistura para reduzir a formação de poeira e/ou erosão. A invenção refere-se adicionalmente a um método para reduzir a formação de poeira e/ou erosão e também a uma mistura adequada para este fim.
Patent BR-112023001618-A2 (BR)
Title: Transmissão híbrida e vaporizador de combustível para veículo vant e outros ambientes móveis
Inventor: ROBERT O'BRIEN
IPC: B64C39/02
Filed: 2021-08-03
Abstract: TRANSMISSÃO HÍBRIDA E VAPORIZADOR DE COMBUSTÍVEL PARA VEÍCULO VANT E OUTROS AMBIENTES MÓVEIS. A presente invenção refere-se a transmissões híbridas que têm um eixo de carga, um motor/gerador, um motor de combustão interna, uma embreagem e uma fonte de alimentação. Além disso, a presente invenção também se refere a vaporizadores de combustível aprimorados do tipo acoplado para uso com um motor de combustão interna.
Patent BR-112023002113-A2 (BR)
Title: Configurar um dispositivo sem fio configurado com conectividade dupla de múltipla tecnologia de acesso via rádio
Inventor: Icaro Leonardo Da Silva
IPC: H04W76/19
Filed: 2021-07-09
Abstract: CONFIGURAR UM DISPOSITIVO SEM FIO CONFIGURADO COM CONECTIVIDADE DUPLA DE MÚLTIPLA TECNOLOGIA DE ACESSO VIA RÁDIO. Métodos e aparelhos são divulgados, incluindo em um exemplo um método desempenhado por um dispositivo sem fio configurado com Conectividade Dupla de Múltipla Tecnologia de Acesso via Rádio (MR-DC). O método compreende receber, a partir de um primeiro nó de rede, pelo menos uma mensagem em um procedimento de reconfiguração para um primeiro grupo de células. A pelo menos uma mensagem indica um modo de operação do dispositivo sem fio para um segundo grupo de células pelo dispositivo sem fio.
Patent CZ-14299-A3 (CZ)
Title: Triazine, benzotriazine and benzophenone derivatives being substituted and bridged by polyoxyalkylene intended for use as uv absorbers
Inventor: TOEN VIEN VAN
IPC: C07D251/24
Filed: 1997-07-07
Abstract: Triazine and benzotriazole derivatives which are substituted or bridged with polyoxyalkylene groups, according to claim 1, and their use as UV absorbers, especially in photographic materials, in inks, including inkjet inks and printing inks, in transfer prints, in paints and varnishes, organic polymeric materials, plastics, rubber, glass, packaging materials, in sunscreens of cosmetic preparations and in skin protection compositions.
Patent CZ-75595-A3 (CZ)
Title: Thermal protection against overload for switches
Inventor: BRANDSTATTER JOSEF ING
IPC: H02H3/33
Filed: 1995-03-24
Abstract: A fault current safety switch has a thyristor (1) which when ignited simulates a fault current in a summing current transformer (5). An ohmic resistance (2) and a PTC resistance (3) interconnected in series are connected in parallel to the thyristor (1). The control line (4) of the thyristor (1) is connected between the ohmic resistance (2) and the PTC resistance (3). The PTC resistance (3) detects the temperature in the summing current transformer (5). When the temperature in the summing current transformer (5) exceeds a predetermined value, the PCT resistance (3) becomes highly resistive and the thyristor (1) is ignited by the control current that starts to flow through the control line (4), simulating a fault current and opening the contacts (10, 11) of the fault current safety switch. A test key (13) and a protective resistor (15) interconnected in series are mounted in parallel to the ohmic resistance (2) connected in series to the PTC resistance (3). When the test key (13) is depressed, closing the contact, the thyristor (1) is also ignited and simulates a fault current in the summing current transformer (5).
Patent CZ-78995-A3 (CZ)
Title: Carbon-containing pigment, process of its preparation and application
Inventor: BERNHARDT KLAUS
IPC: C09D5/36
Filed: 1995-03-29
Abstract: New carbonaceous pigments are obtainable by pyrolysis of substrates coated with one or more metal oxides and colloidal organic particles, and opt. with an organosilane, at temps. above 700 degrees C in the absence of O2. Also claimed is a process for producing the pigments, comprising adding a hydrolysable metal salt soln. and an aq. organic colloid soln. simultaneously but separately to an aq. substrate suspension while adding a base or acid to adjust the pH to a value at which the metal salt is hydrolysed; opt. adding an organosilane and/or an aq. organic colloid soln.; separating, washing and drying the coated substrate; and calcining the substrate at a temp. above 700 degrees C in the absence of O2. Also claimed is the use of carbonaceous pigments in formulations such as paints, lacquers, printing inks, plastics and cosmetics. Pref. the substrate is a flaked material, esp. mica (opt. coated with metal oxide) or glass, silica or ceramic flakes. The colloidal organic particles comprise starch, cellulose, gelatin or their derivs. The organosilane is of formula Y(CH3)nSi(X)3, where Y = NH2, vinyl, methacryloyloxy, 2,3-epoxypropoxy, NHCH2CH2NH2, SH, Cl or 2-imidazolin-2-yl; X = 1-6C alkoxy, Cl or acetoxy; and n = 0-3. The metal salt is a Ti salt or trivalent Ce salt.
Patent SK-15097-A3 (SK)
Inventor: STOFAN JOZEF
IPC: E05B29/10
Filed: 1996-12-27
Abstract: Teleso
(1)
bezpečnostnej
mechanickej
vložky
segmen
­
tového
typu
je
z
jednej
strany
osadené
uvoľňovacou
otočnou
vložkou
(3)
a
z
druhej
čelnej
strany
je
osadené
uzatváracou
otočnou
vložkou
(2)
minimálne
s
troma
kombinačnými
usporiadaniami
(5)
segmentového
typu,
pričom
ovládací
člen
(4)
sčasti
prekrýva
len
uzatváraciu
otočnú
vložku
(2)
a
je
s
ňou
pevne
a
rozoberateľné
spojený.
Proti
vytrhnutiu
je
uzatváracia
otočná
vložka
(2)
a
uvoľňovacia
otočná
vložka
(3)
opatrená
zaisťova
­
cími
príchytkami
(10)
a
navyše
ovládací
člen
(4)
je
o-
patrený
upevňovacím
kolíkom
(11).
Teleso
(1)
je
na
čelnej
strane
opatrené
výstupkom
(13),
v
ktorom
je
u-
miestnený
vonkajší
upevňovací
otvor
(15).
Patent SK-23099-A3 (SK)
Title: 3-substituted pyrido[4',3':4,5]thieno[2,3-d]pyrimidine derivatives, their preparation and their use
Inventor: STEINER GERD
IPC: C07D495/14
Filed: 1997-08-22
Abstract: The invention concerns 3-substituted 3,4,5,6,7,8-hexahydro- pyrid3':4,5]thieno-[2,3-d]pyrimidine derivatives of formula (I), their physiologically acceptable salts and use in the therapy.
Patent SK-35795-A3 (SK)
Title: Revolving door drive, device and process for operating it
Inventor: BERAN MARK
IPC: E05F15/603
Filed: 1994-07-14
Abstract: Apparatus is are disclosed for selective alteration and control of door movement modes, the apparatus being primarily non-hydraulic and incorporated with a known mechanism which is functional independently from the apparatus in one mode of operation and which includes a piston for controlling door closing characteristics by selected fluid flow within the mechanism. The apparatus includes a motor driven lead screw having a linearly movable shuttle unit mounted thereon, the shuttle unit being positioned relative to the piston of the mechanism to accommodate nonattached contact with the piston to urge the piston, when the shuttle unit is moved, in a direction that will at least provide selective assistance with door opening in another mode of operation.
Patent CH-686988G-A3 (CH)
Title: Analogue display for timepiece mechanism
Inventor: BUCHSER ROGER
IPC: G04B19/20
Filed: 1994-12-12
Abstract: The analogue display uses a combination of time indication hands (2) and discs (1), driven at different rotation rates. The hours indication is provided by a disc directly fitted to the drive shaft (3) of the timepiece mechanism, with the minutes indication provided by a hand or a further disc. Pref. the hours display disc is fitted to the timepiece mechanism drive shaft via a press fitting, with the timepiece face (7) directly secured to the timepiece housing. Pref. the hour numerals are marked around the hours disc in a counter-clockwise direction.
Patent CZ-264592-A3 (CZ)
Title: Pump suction basket
Inventor: BULVA VLADIMIR RNDR
IPC: F04D29/70
Filed: 1992-08-27
Abstract: A pump suction basket, particularly for pumping oil products with water from sanitation drills, formed from above by an open hollow body (1), provided on the outer cover by at least one slot (2), whereas in the inner space of the hollow body (1) is the hole of the suction pump. The slot (2) of the hollow body (1) may have adjustable width.
Patent CZ-286592-A3 (CZ)
Title: tube with anti-corrosive protection and process for producing thereof
Inventor: PAULS JOCHEN
IPC: C23D5/02
Filed: 1992-09-17
Abstract: Corrosion-resistant pipe consisting of a protective coating (I) (16) contg. chromate and phosphate applied to the inner surface of a steel pipe (10,12) the novelty being that (I) contains 30-50 wt.% binder (II) plus 70-50 t.% metallic filler (III), whereby the compsn. of (II) is 3-40 wt.% chromate and 97-60 wt.% phosphate, and (III) consists of pure Al, Cr, Mg, Zn, Ti or Cd, or alloys having particle size 5-100 mm. dia., pref. 30 +/- 5 mm. dia. Binder (II) pref. contains 1-10 wt.% TiO2 (dia. 0.1-5 mm.), 5-15 wt.% MgO and 0.1-5 wt.% Al2O3 and/or SiO2, relative to total mass. Metal particles in the filler (III) are mfd. by spraying the metal into an inert gas atmos. The protective coating (I) 25-250 mm. thick is applied to a high-tensile steel pipe wall composed pref. of one of the following: CMnNbVMo-steel, CMnNbMo-steel, CMnNbTi-steel and CMnNbV-steel. (I) also contains 0.1-5 wt.% Cd and/or Mo ions, relative to total mass of coating. ADVANTAGE - The protective layer exhibits good thermal stability between -183 and +650 deg.C, ductility and electrical conductivity, and subsequent organic and inorganic coatings can be applied.
Patent CZ-336692-A3 (CZ)
Title: Apparatus for producing protective layer of a ballast bed and process of maintaining the ballast bed
Inventor: THEURER JOSEF ING
IPC: E01B29/04
Filed: 1992-11-11
Abstract: A formation protection layer 3 located between a formation 2 and a ballast layer is formed using two independent track maintenance vehicles 4, 5. An excavating device 18 for removing the old ballast, and conveyor belts for carrying it away, are associated with the first track maintenance vehicle 4. The second track maintenance vehicle 5, which follows the first track maintenance vehicle 4, has a grading and consolidating device 35 for the sand of the formation protection layer 3 and a brush 39 for wiping the sand lying on the sleepers into adjacent sleeper cribs. Both track maintenance vehicles 4, 5 have track lifting devices 26 with rollers 27 which grip the rails. <IMAGE>
Patent CZ-342291-A3 (CZ)
Inventor: STETKA JAN
IPC: F16H48/00
Filed: 1991-11-12
Abstract: Diferenciálníspojka s postupně plynulým pevným záběrem,
určená pro přenos rotačního pohybu mezi dvěma členy, je
tvořena diferenciálem (10), jenž je spojen s ozubeným
kolem (9), které zapadá do ozubení hnacího ozubeného kola
(3) hnací hřídele (1). Hřídel (5) diferenciálu (10) je spojena
s ozubeným kolem (7), jež zapadá do ozubení hnané- ho
ozubeného kola (4) hnané hřídele (2). Na hří- děli (6) diferenciálu
(10) je upraveno ovládacízařízení (8).
Patent CZ-377292-A3 (CZ)
Title: Stopper for a metallurgical casting vessel
Inventor: LAX HERMANN
IPC: B22D41/18
Filed: 1992-12-18
Abstract: The invention relates to a refractory stopper for a metallurgical vessel used in casting. The stopper 5, which can have a central axial channel 5b, has an axial channel 5d which ends eccentrically before the stopper cap 5a and is situated in an axially extending rib 5c formed integrally on the stopper 5. Accommodated in this other axial channel 5d is a thermocouple 6 with its instrument leads.
Patent CS-378791-A3 (CS)
Title: Granulated coil insecticides and nematocides with reduced dermal toxicity to mammals
Inventor: MILLIONIS JERRY PETER
IPC: A01N25/12
Filed: 1991-12-13
Abstract: There are provided new granulated soil insecticidal-nematicidal compositions with concomitant reduced mammalian dermal toxicities, comprising an inert granular, biodegradable, sorptive carrier of renewable resource material and an insecticidally and nematicidally effective amount of O,O-diethyl S-{[(1,1-dimethylethyl)thio]methyl}phosphorodithioate or O,O-diethyl S-(ethylthiomethyl)phosphorodithioate.
Patent CZ-118094-A3 (CZ)
Title: Tooth system finishing process and a machine tool for making the same
Inventor: LORENZ MANFRED ING
IPC: B23F19/05
Filed: 1994-05-13
Abstract: The gear (1) to be finished is rotated in mesh with the honing tool (3) which is in the form of an internal gear with abrasive teeth which remove metal from the workpiece gear during rotation. The spindle drives of the workpiece gear and the honing tool are electronically coupled. Before machining takes place, the honing tool is rotated in mesh with the workpiece gear, which is allowed to rotate freely under no load. The deviations from true angular displacement of the workpiece gear are registered by the control system. The electronic coupling is then engaged and during machining uses the stored information on the gear errors to modify the relative speeds in a way that varies the metal removal rate and corrects the overall pitch error of the gear.
Patent CZ-121095-A3 (CZ)
Title: Electronic control system of a vacuum cleaner
Inventor: HOEKSTRA PETER
IPC: G05F1/66
Filed: 1995-05-10
Abstract: An electronic control system (70) for a vacuum cleaner is provided that supports two-way communications between a control unit (72) in the handle of the vacuum cleaner and a suction motor (92) and various sensors in the canister of the vacuum cleaner, using wires (106) contained within the hose of the vacuum cleaner. The vacuum cleaner may be placed in one of two user-selectable bag change modes. In a maximum suction (MAX SUCTION) bag change mode, the electronic control system of vacuum cleaner will shut off the vacuum cleaner when the vacuum cleaner bag has filled and the suction power of the unit has been degraded as a result. If the maximum fill (MAX FILL) bag change mode is selected, the electronic control system (70) will shut off the vacuum cleaner only after the bag has filled to the maximum extent allowable. The control system has indicator lights (82) to display to the user whether the maximum suction or the maximum fill mode has been selected. The control unit (72) also includes a dust detection circuit (88) linked to an optical dust sensor (90) which is based on one-piece lens units located in the vacuum cleaner handle for monitoring the frequency with which dust particles flow through the hose into the vacuum cleaner. The control system can automatically adjust the power setting of the vacuum cleaner based on the measured frequency. <IMAGE>
Patent CZ-143893-A3 (CZ)
Title: Element for mass transfer
Inventor: NIKNAFS HASSAN S
IPC: B01J4/00
Filed: 1993-07-16
Abstract: Described are mass transfer elements with an essentially four-lobed cylindrical configuration which are particularly effective random dumped packing elements for mass transfer towers, providing a combination of high surface area and low pressure drop. <IMAGE>
Patent CZ-150899-A3 (CZ)
Title: Cosmetic preparation in form of oil-in-water emulsion and process for preparing thereof
Inventor: ALWATTAI ALI ABDELAZIZ
IPC: A61K8/26
Filed: 1997-10-30
Abstract: The present invention relates to oil-in-water mascara compositions comprising water-insoluble polymeric materials in the form of an aqueous emulsion, water-soluble, film-forming polymers and organophilic clays. Said compositions exhibit improved wear and are removable with soap and water.
Patent CZ-166098-A3 (CZ)
Title: Anaestetic system, method of controlling anaestetic apparatus and use of mass spectrometer
Inventor: DONNERHACK ANDREAS
IPC: A61B5/08
Filed: 1996-11-16
Abstract: An anaesthetic system (10) is disclosed with a mass spectrometer (11) for simultaneously determining levels of oxygen, anaesthetic gas and nitrogen in the positive pressure gas. The composition of the inspiratory gas and expiratory gas is determined by the mass spectrometer (11) and forwarded as a measurement signal to a control unit (12) such as a computer, allowing the anaesthetic system to be automated.
Patent CZ-171594-A3 (CZ)
Title: Enhanced process for preparing shaped hydrogel articles such as contact lenses and employing an inert displaceable thinning agent
Inventor: NUNEZ IVAN M
IPC: G02B1/04
Filed: 1994-07-15
Abstract: Shaped hydrogel articles such as soft contact lenses are prepared by the steps of:     (1) molding or casting a polymerization mixture comprising:   (a) a monomer mixture comprising a major proportion of one or more hydrophilic monomers such as 2-hydroxyethyl methacrylate, and one or more cross-linking monomers; and (b) an inert, displaceable diluent selected from the group consisting of:     (i) ethoxylated alkyl glucoside;   (ii) ethoxylated bisphenol A;   (iii) polyethylene glycol;   (iv) mixture of propoxylated and ethoxylated alkyl glucoside; (v) single phase mixture of ethoxylated or propoxylated alkyl glucoside and C2-12 dihydric alcohol; (vi) adduct of  epsilon -caprolactone and C2-6alkanediols and triols;     (vii) ethoxylated C3-6alkanetriol; and   (viii) mixtures of one or more of (i) through (vii), under conditions to polymerize said monomer mixture to produce a shaped gel of a copolymer of said monomers and said diluent; and   (2) thereafter replacing said diluent with water. xt
Patent CZ-202090-A3 (CZ)
Inventor: LIBOSVÁROVÁ ANETA
IPC: E04C2/28
Filed: 2020-02-21
Abstract: Prvek zejména pochozí venkovní dlažby obsahuje vodopropustné dno (1), alespoň jednu boční stěnu (2) a vodopropustné víko (3), které jsou vzájemně spojeny. Vnitřní prostor prvku je zaplněn kusovým materiálem o velikosti 3 až 30 mm. Prvek je opatřen alespoň jedním spojovacím prvkem (6) pro vzájemné spojení sousedních prvků a alespoň jedním hřebem (7) pro uchycení do země. V půdorysu může mít prvek tvar vybraný ze skupiny kruh, ovál, n-hran, kde n je 3 až 24. Kusový materiál je vybrán ze skupiny přírodní kamenivo, umělé kamenivo, plasty, drcená pryž, štěpka, keramika, sklo, kov.
Patent CZ-211596-A3 (CZ)
Title: Metalloprotease inhibitors, process of their preparation, their use and pharmaceutical compositions containing thereof
Inventor: BECKETT RAYMOND PAUL
IPC: C07D249/18
Filed: 1995-01-20
Abstract: The novel compound L-tert-leucine-2-pyridylamide is a useful intermediat for the preparation of matrix metalloproteinase inhibitor compounds.
Patent CZ-230796-A3 (CZ)
Title: Decorative bag containing baker°s article and process for producing such decorative bag
Inventor: OOMS GUIDO
IPC: B65B3/02
Filed: 1996-08-02
Abstract: A piping bag containing a bakery product, such as, for instance, whipped cream, pastry cream or a like pasty substance, comprising a bag-shaped flexible container consisting of plastic film material, which container contains the ready bakery product and is closed through a sealed or glued joint and is suitable for prolonged storage in a refrigerator or freezer, the container comprising an angular tip which is removable through cutting or tearing for forming a spray opening, while an insert (4) with a passage (18) is placed adjacent the removable angular tip (2) in the interior of the container, which insert (4), at least through a part of the height of the external surface thereof, is in sealing abutment with the plastic film (11) of the flexible container (1), and the insert (4), on the external circumference thereof, comprises provisions (5, 9) for the purpose of attaching a spray nozzle (6) or closure cap (14). The invention further relates to a method for manufacturing such piping bag. <IMAGE>   <IMAGE>
Patent CZ-255697-A3 (CZ)
Title: Sleeping bag
Inventor: SMIC PAVEL
IPC: A47G9/08
Filed: 1997-08-12
Abstract: In the present invention, there is disclosed a sleeping bag /1/ intended particularly for extreme cold conditions and consisting of an inner cover layer /2/ and an outer cover layer /3/ with a thermally insulation intermediate layer /4/ disposed therebetween. Said sleeping bag inner cover layer /2/ surface is smaller that surface of its outer cover layer /3/, whereby all over the length thereof in both transverse planes, being perpendicular to the sleeping bag /1/ longitudinal axis and longitudinal planes, passing through the longitudinal axis, the circumference of the sleeping bag /1/ inner cover layer /2/ is smaller by a predefined length difference amounting to four to seven multiple of the thermally insulating layer /4/ if compared with the circumference of the outer cover layer /3/ in the same plane.
Patent CZ-268694-A3 (CZ)
Title: Process for preparing pivaloylhydrazide
Inventor: VERBRUGGE PIETER ADRIAAN
IPC: C07B61/00
Filed: 1994-11-02
Abstract: A process for the preparation of pivaloyl hydrazide which comprises reacting pivalic acid with hydrazine in the presence of a catalytic amount of amorphous titanium dioxide in an inert solvent, in the presence of water.
Patent CZ-324395-A3 (CZ)
Title: Corrosion prevention method of a tank and the tank according the method
Inventor: BOUVIER DANIEL
IPC: F17C13/02
Filed: 1995-12-08
Abstract: The envelope (3), of e.g. polyethylene, is sealed (6) round an access pit containing the moisture alarm unit (10) and tank filler (33). The enclosed space (5) contains e.g. air, or nitrogen. The detector (7) is formed from an electrically insulating, thermally conducting membrane of e.g. Silpad (RTM), applied to a magnet block attached to the steel tank bottom (4). Two e.g. platinum electrodes on the membrane, connected (8, 9) to the alarm unit (10), form a circuit through a layer of hygroscopic salt, e.g. LiCl, NaCl, whose resistance falls markedly when wet. The transistorised alarm unit then presets a warning lamp circuit with a check button, pressed on each routine staff visit. Presetting also occurs if the detector falls off. A proving circuit is also provided.