baber/WOPTO huggingface dataset:
Patent KR-200490019-Y1 (KR)
Title: 편백나무를 이용한 발향 공기청정기
IPC: F24F13/20
Filed: 2019-04-25
Granted: 2019-09-10
Abstract: 편백나무를 이용한 발향 공기청정기에 관한 것으로, 소정의 크기로 형성되는 케이스본체의 상면에 공기가 통하도록 개방된 상면개방구가 형성되며, 하부에 공기가 유입되도록 다수의 공기유입구가 형성되고, 일면에 활성탄수납케이스를 끼워넣을 수 있도록 개방된 입구개방구가 형성되며, 발향 목재로 이루어지는 메인케이스; 상기 입구개방구에 대응되는 전면판이 구비되고, 상기 공기유입구보다 높은 위치에 소정량의 활성탄이 수납되도록 각각으로 구획된 활성탄수납부가 형성되며, 발향 목재로 이루어지는 활성탄수납케이스; 상기 활성탄수납케이스를 통과하면서 정화된 공기 및 발향 목재에서 발산되는 향이 외부로 방출되도록 상기 메인케이스의 상면개방구에 탈착 가능하게 구비되며, 발향 목재로 이루어지는 케이스덮개; 상기 활성탄수납케이스에서 정화된 공기가 외부로 방출되도록 상기 케이스덮개의 상면에 설치되며, 발향 목재로 이루어지는 커버;를 마련하여 메인케이스, 활성탄수납케이스, 케이스덮개, 활성탄 상부수납케이스 및 커버가 발향 목재로 이루어져 실내 공간 및 주방, 화장실 등의 냄새를 제거할 뿐만 아니라 발향 목재에서 발생되는 피톤치드를 발산시켜 실내 환경을 보다 쾌적하면서도 청정하게 유지할 수 있다는 효과가 얻어진다.
Patent KR-200494703-Y1 (KR)
IPC: B65F1/06
Filed: 2020-06-15
Granted: 2021-12-03
Abstract: 본 고안은 종량제 봉투 또는 생활쓰레기를 담아서 버리는 비닐 봉투를 휴지통 등의 수거함 밖으로 나오지 않게 하여 깔끔한 외관을 제공함과 동시에 간편하게 고정할 수 있는 비닐봉투 고정구가 구비된 물품 수거함에 관한 것으로, 원형 또는 다각형 형상으로 이루어지며, 수용공간(11)을 구비하는 본체(10)와 상기 본체(10)의 상단에 배치 및 결합 되면서 비닐 봉투(40)를 고정하기 위한 고정구(30)가 구비된 뚜껑(20)으로 구성되되, 상기 뚜껑(20)의 내측 가장자리 일측에는 고정구(30)가 착탈식으로 끼움 고정될 수 있도록 고정홈(21)이 좌, 우 대칭형으로 형성되며, 그 고정홈(21)의 일측에는 고정구(30)가 밀착되면서 비닐 봉투(40)가 고정되도록 하는 고정패널(22)이 형성되는 한편, 상기 고정구(30)는 비닐 봉투(40)를 젖혀서 고정할 수 있도록 가운데에는 만곡부(31a)가 형성된 졸대(32a)가 구비되며, 상기 졸대(32a)의 양측 끝단에는 고정홈(21)에 삽입될 수 있도록 삽입부(33a)가 형성된 젖힘형 고정구(30a)와, 비닐 봉투(40)를 집어서 고정할 수 있도록 가운데에는 탄성 복원력을 발휘하는 만곡부(31b)가 형성된 졸대(32b)가 구비되며, 상기 졸대(32b)의 양측 끝단에는 고정홈(21)에 삽입될 수 있도록 삽입부(33b)가 형성된 집게형 고정구(30b) 중 선택된 어느 하나의 고정구로 구성된다.
Patent KR-200496388-Y1 (KR)
Title: 빵틀
IPC: A21B3/13
Filed: 2022-03-04
Granted: 2023-01-18
Abstract: 본 고안은 빵을 복잡한 형태로 성형할 수 있도록 된 새로운 구조의 빵틀에 관한 것이다. 
본 고안에 따른 빵틀은 실리콘재질로 구성됨으로, 빵을 만든 후, 측벽(20)의 상단을 외측으로 벌려 완성된 빵을 손쉽게 꺼낼 수 있으며, 빵을 꺼낼 때 빵의 형태가 손상되는 것을 방지할 수 있는 장점이 있다.
Patent PH-22015000806-Y1 (PH)
Title: Multi-storage utility chair
Inventor: VILLACAMPA EILEEN JOAN L
IPC: A47C7/00
Filed: 2015-10-19
Abstract: The present utility model relates to a multi-storage utility chair. The multi-storage utility chair was developed to solve the difficulty in locating tools and related implements. It is intended for mobile nail artists traveling from one place to another. This will give proper storage for the tools and implements of which it has a compartment that is orderly organized. The present utility model is a trolley-type chair for easy handling, featuring its backrest portion together with a seating cushion that has an under seat storage for other materials and provides a drawer for tools and other supplies. And it has also compartment that holds dozens of storage for nail polish with black patch pocket storage for the backrest cushion.
Patent PH-22016000456-Y1 (PH)
Title: Process of producing bioethanol from mangosteen peelings
Inventor: AWATIN KRYZSHA BLESS P
IPC: C12P7/08
Filed: 2016-07-13
Abstract: The present utility model relates to a novel process of obtaining bioethanol from mangosteen rinds and peelings, comprising the steps of preparing the extract from mangosteen rinds or peelings, adding 10 g of active dry yeast per 300-600 mL to the said extract, leaving an opening in the container to allow the gas being produced during fermentation to escape to avoid explosion, and storing the containers in a room at 26oC to 28oC for 72-120 hours, storing the containers in a room at 26oC to 28oC for 72-120 hours, distilling the stored extract at temperature up to 78.5oC to produce bioethanol, and collecting the bioethanol for further processing.
Patent PH-22018000539-Y1 (PH)
Title: Lightweight pavement blocks
Inventor: SOLOMON RODOLFO B
IPC: E04C1/40
Filed: 2018-06-15
Abstract: The present utility model relates to concrete blocks but more particularly to lightweight pavement blocks comprising of a mixture of sand, cement, polystyrene beads and water. The study showed that the more polystyrene beads is mixed into the cement, the lower the value of compressive strength would be achieved.
Patent PH-22020000159-Y1 (PH)
Title: A ready-to-eat- food product
Inventor: LOBERIANO FLORIDEL V
IPC: A23L7/196
Filed: 2020-03-10
Abstract: The present utility model relates to a ready-to-eat food product that has the complete requirements for a flavorful food with solid and liquid components to thereby satisfy appetite for consumption and sustain the nutrition needed by victims of a calamity or the likes. The ready-to-eat food product being contained in a retort pouch and comprising a cooked mixture of five (5) grams of minced meat, seventy (70) grams of rice and one hundred twenty five (125) grams of soup to thereby yield a 1:14:25 ratio.
Patent BR-202012016872-Y1 (BR)
Title: Melhoria funcional na câmara de aquecimento e nas portas de um forno para utilização em panificação
Inventor: Brígido Inácio De Morais
IPC: F24C7/06
Filed: 2012-07-09
Abstract: melhoria funcional na câmara de aquecimento e nas portas de um forno para utilização em panificação. refere-se a presente patente de modelo de utilidade numa melhoria funcional na fabricação do sistema de aquecimento da câmara (cm) utilizada para assar, através de tubos (21) inoxidáveis, alinhados paralelamente tanto na parte inferior quanto na parte superior no interior da dita câmara (cm), contendo nesse interior dos ditos tubos (21), porcelanas cilindricas (23) cujo tamanho é de aproximadamente 6 cm conectadas uma às outras, obedecendo ao múltiplo do tamanho da dita porcelana cilíndrica (23) com resistências (24) em espiral proporcionando uma melhoria tanto na distribuição do calor quanto do armazenamento e manutenção desse calor no interior da câmara (cm) devido, também, à porta (p) a qual é constituída por uma dobra uma froma de "u" fazendo um encaixe (12) para ser é encaixada no encaixe (17) do suporte frontal superior (5) com uma dobra de uma faixa transversal (13) e mais segunda faixa transversal (14) com duas a três vezes a largura da primeira faixa (13) e uma ponta faixa inferior (15) a qual funcionará como junta seca no ressalto (6a) do suporte frontal inferior (6), com abertura e fechamento através de um suporte com formato "t" (9) com um cabo (9b) e um suporte com formato "c" (8) fixados na faixa transversal (13) da dita porta (p) e, interligados por um tubo (tb).
Patent BR-202014027590-Y1 (BR)
Title: Óculos de proteção
Inventor: FABIO BORSANI
IPC: A61F11/06
Filed: 2014-11-05
Abstract: óculos de proteção. o presente modelo se refere a um par de óculos de proteção, compreendendo uma parte frontal (2) de proteção dos olhos e um par de hastes laterais (4) aptas a serem apoiadas sobre a parte superior das orelhas. quando em uso sob um abafador concha (50) de proteção contra ruídos possuindo um par de conchas auriculares (52) as quais recobrem as orelhas, a extremidade posterior (4') de ditas hastes não se projeta para além da parte posterior da zona anular de contato (54) da concha auricular (52) com a cabeça do usuário.
Patent BR-202017019079-Y1 (BR)
Title: Disposição construtiva aplicada a câmara de ar de veículos
Inventor: HÉLIO LUCIOLI NETO
IPC: B60C5/00
Filed: 2017-09-06
Abstract: Compreende a presente patente de modelo de utilidade de uma disposição composta, em sua circunferência interna, particularmente de duas travas de fixação vulcanizadas e suas respectivas arruelas, a fim de evitar deslocamentos e giros dentro do pneu, quando por ventura a câmara for danificada. Dotada de relevos internos e chanfros de ajuste para pressionar o talão do pneu na roda do veículo, bem como ainda, do bico/válvula de enchimento, e de saliências ao pneu, bem como de saliências menores na circunferência interna.
Patent BR-202018013144-Y1 (BR)
Title: Válvula de enchimento com fechamento inverso
Inventor: Antônio Carlos Stringhini
IPC: B67C3/26
Filed: 2018-06-26
Abstract: O seguinte resumo para modelo de utilidade se refere ao desenvolvimento de uma válvula empregada no enchimento de fluidos de diferentes viscosidades, onde se pretende conseguir um envase e dosagem de líquidos sem gotas ou respingos, evitando qualquer tipo de contaminação ao meio externo da embalagem/garrafa/frasco (11), sendo que dito enchimento de produtos químicos ou bebidas possui fechamento efetuado com movimento de baixo para cima entre o elemento de vedação (02) e o assento de vedação (09).
Patent JP-S6039070-Y2 (JP)
IPC: F04B13/02
Filed: 1982-09-27
Granted: 1985-11-22
Abstract: Apparatus (10) for automatically dispensing a liquid treatment chemical (12) from a replaceable supply bottle (14) into an intermittently flowing liquid stream (22) such as a recirculating water supply for a refrigeration system. The apparatus has a feeder chamber (16) into which the liquid stream (22) flows which is periodically emptied by a siphon tube (18) when the liquid reaches a level sufficient to establish a siphon effect in the siphon tube (18). The rising level of liquid (22) in the chamber (16) also actuates, by means of a float (24), the valve portion (31) of a closure assembly (30) on the inverted top of the supply bottle (14). The valve portion (31) is fed by a capillary tube (50) and dispenses a predetermined, very small quantity of chemical each time it is actuated. The valve portion (31) is prevented from becoming clogged by chemical crystals during inactive periods by being mounted so that its surface will be flushed each cycle by the water (22) which rises in the feeder chamber (16).
Patent IT-220991-Z2 (IT)
IPC: D06B23/04
Filed: 1990-08-23
Granted: 1993-12-21
Abstract: One of the ends (X) of the tube has an internal annular ledge (7) and an annular wall (9), the internal surface (9A) of which forms an annular corner (10) around the ledge (7) and widens slightly as it moves away from the ledge; the other end (Y) forms a setback (12) towards the inside followed by an approximately cylindrical collar (14) for the turns of reserve yarn, the annular edge (14A) of which is capable of bearing against said ledge (7) and of being centered by said annular corner (10); said annular edge (14A) has hollows (16) which are capable of allowing the passage of fluid which thus acts on the turns of the reserve. <IMAGE>
Patent CR-7045-A (CR)
Title: Anticuerpos para el receptor de factor de crecimiento i similar a la insulina
Inventor: MOYER JAMES D
IPC: C12N5/06
Filed: 2003-08-05
Abstract: Anticuerpos y porciones que ligan antigeno de los mismos que se ligan especificamente al receptor del factor de crecimiento similar a insulina 1 (IGF-IR), factor que es preferentemente el IGF-IR humano. La invencion tambien se refiere a anticuerpos anti-IGF-IR humanos incluyendo anticuerpos quimericos, biespecificos, derivatizados, de cadena simple o porciones de proteinas de fusion. La invencion tambien se refiere a moleculas aisladas de la cadena pesada y liviana de inmunoglobulina derivadas de anticuerpos anti-IGF-IR y a moleculas de acido nucleico que codifican tales moleculas.
Patent DK-4788-A (DK)
Inventor: OLSEN OLE
IPC: G01N21/84
Filed: 1988-01-06
Abstract: Trimmings are meat pieces used to make mincemeat products in meat processing activities. They are classified according to their fat content and/or category. In automated production facilities, automatic classification of the meat pieces can be implemented by means of a video recording equipment. A video recording is taken of the meat pieces, and one determines the area of the picture portions whose light value is above or below a threshold value. The area value is processed along with other data in a calculating unit to assign the meat pieces to a class. Light of diffuse nature can be used for the recording. <IMAGE>
Patent GB-172232-A (GB)
Title: Improvements in vertical steam boilers
IPC: F22B13/02
Filed: 1921-01-03
Abstract: 172,232. Alley, S. E. Jan. 3, 1921. Vertical boilers; annular boilers.-In a boiler of the kind in which inner and outer vertical cylindrical shells enclose an annular water space, and inclined straight water-tubes extend across the inner shell, the ends of the water-tubes are secured in two series of landings L, M, each in the form of helical depressions. The group of tubes P extending between the top of the landings M and the bottom of the landings L lie at the greatest angle to the axis of the shells, the next group R lying at a smaller angle and the group S extending between the bottom of the landings M and the top of the landings L at the smallest angle. Specification 112,222 is referred to in the Provisional Specification.
Patent GB-112302-A (GB)
Title: Improvements in and relating to Foundry Cars and Wheels for same.
Inventor: CONCES VINCENT JOSEPH
IPC: B22D41/12
Filed: 1917-01-02
Abstract: 112,302. Conces, V. J., and Conces, V. J. Jan. 2, 1917. Wagons; framing. - A foundry car body is built up of a number of longitudinal guides 3, 5 connected by similar end girders and a number of lateral members 7, 8 between adjacent longitudinal members. These members 7, 8 are staggered. The various members are united by angle plates 6. The wheels comprise bolts held in flanged sections carried by cross members 9.
Patent GB-843910-A (GB)
Title: Improvements in or relating to vehicle suspension systems
Inventor: SILVESTER BRIAN CAROL
IPC: B60G15/06
Filed: 1959-01-01
Abstract: 843,910. Maintaining vehicle height constant. ROVER CO. Ltd. Jan. 1, 1959, No. 31/59. Class 108(2). Vehicle height is maintained constant under changes in vehicle load by varying the line of action of a suspension spring 8 by the action of a jack 11. As shown, applied to a rear axle 2 carried by trailing arms .10, coiled suspension springs 8 (1 only shown) act between respective suspension arms 10 carried by the vehicle frame 4 and a pivot 7 at the extremity of a swingable arm 5. In the normal position of the vehicle, the pivotal axis of the arm 5 with the vehicle frame at 6 is co-axial with the axis 9 of the connection of the spring 8 with the arm 10, When a change in load occurs, the jack 11 is operated to deflect the arm 5 into a position in which the axes 6 and 9 are co-axial once more. Alternatively, a single spring may be used to suspend both road wheels carried by the axle 2. In a modified construction (Fig. 4, not shown), the spring 8 acts between the pivot 7 and a pivotal connection with a transverse]y extending wishbone link type of wheel carrying member. The jack 11 may be hydraulic, pneumatic, screw actuated, or may be operated by an electric motor. Locking means may be used to hold the arm 5 in position.
Patent GB-227123-A (GB)
Title: Improvements in or relating to automatic brakes
IPC: B66D5/26
Filed: 1925-01-01
Abstract: 227,123. Siemens - Schuckertwerke Ges. Jan. 2, 1924, [Convention date]. Addition to 226,547. Brakes for winding and paying-out apparatus; overwinding, preventing; regulating and controltransmitting gear. - The system of weighted levers 37<a>, 39<a> operated from the hand lever M or by the weight 96 as described in the parent Specification are arranged so that operation by the hand lever or other of the brake-actuating forces of the parent Specification allows both weights to fall, whereas operation by the weight 96 only slides the bar 20<a> sufficiently to drop the lever 37<a>, the pin 221<a> not being moved far enough to disengage the lever 39<a>.
Patent IS-6331-A (IS)
Inventor: DIRKS CHRISTIAAN HENRI PETER
IPC: A01K75/00
Filed: 2002-04-04
Abstract: The invention relates to a knot in a first and a second rope, each rope having a left and a right end, between which is a turning point, characterised in that, at the turning points, the first and the second rope cross both ends of the second, on one side, and of the first rope, on the other side, respectively, the left and right end of each rope forming an intersection after the turning points and the knot between the intersections comprising at least four crossings of the two ropes.The invention also relates to a method for making the knot and to the use of the knot in fishing nets. In particular, the invention relates to HPPE fishing nets comprising knots according to the invention.
Patent JP-H03206047-A (JP)
Title: Viscoelastic contraceptive
Inventor: KITA KIYOSHI
IPC: A61K31/715
Filed: 1990-01-05
Abstract: PURPOSE:To obtain the subject viscoelastic contraceptive capable of very high- probability contraception, having low side effects and having high safety by dissolving sodium hyaluronate and a buffer in a distilled water so as to prepare an aqueous drug. CONSTITUTION:Sodium hyaluronate having 50000-8000000, generally 350000-4000000 molecular weight is blended so that the concentration thereof in the finally obtained aqueous solution may be 0.1-2.0wt.% and one or more compounds selected from sodium chloride, disodium hydrogenphosphate and sodium dihydrogenphosphate are added thereto as a buffer. The resultant mixture is dissolved in water to prepare an aqueous drug. By injection of the resultant aqueous drug into the vagina or by application thereof to the genital organs before coitus so as to fill the neck of the womb therewith, penetration of spermatozoa into the womb can be prevented or consumption of hyaluronidase in ejaculated spermatozoa can be promoted for prevention of fertilization, thus enabling the objective high-probability contraception.
Patent DK-18481-A (DK)
Inventor: IGRAM F
IPC: B29C48/475
Filed: 1981-01-16
Abstract: A method and apparatus for the formation of shaped crosslinked polyolefinic materials by subjecting a crosslinkable polyolefinic material to a high pressure in a high pressure treatment zone (34), passing the material from said high pressure treatment zone to a relaxation and expansion zone at a temperature below that at which crosslinking takes place, and thereafter shaping and heating the material to a temperature above that at which crosslinking occurs and allowing the crosslinking reaction to proceed substantially to completion.
Patent DK-51686-A (DK)
Inventor: LO YOUNG SEK
IPC: C07D453/02
Filed: 1986-02-03
Abstract: A process for the preparation of 2-alkoxy- N-(1-azabicyclo[2.2.2]octan-3-yl) aminobenzamides, which are gastric pharmaceuticals in monogastric animals having the formaula:wherein R is hydrogen or loweralkyl,R' is lowealkyl,R<sup>2</sup> is hydrogen, halo or loweralkoxy, Am is amino, methlamino or dimethylaminois disclosed wherein in the initial step an appropriate monoprotonated 3-aminoquinuclidine strong acid salt and an appropriate amino benzoic acid all in a 50-90 vol. % pyridine in water solution are reacted in the presence of N,N'-dialkylcarbodiimide. The free base may be obtained by conventional procedures from the mixtures with minimal purification effort.
Patent GB-1520791-A (GB)
Title: Vehicle headloamp assembly
IPC: B60Q1/068
Filed: 1975-01-02
Abstract: 1520791 Adjusting vehicle headlamps LUCAS ELECTRICAL Ltd 19 Dec 1975 [2 Jan 1975] 155/75 Heading F4R A vehicle headlamp assembly comprises a lamp body 12 adjustably mounted in a hollow housing 10 and manually adjustable means for selecting any one of a plurality of positions of the body relative to the housing, the means comprising relatively rotatable cam and cam follower members 17, 18, the cam having a plurality of diametrically extending recesses of different depths and the follower having a diametrically extending ridge 20 for engagement with the recesses. The cam 17, which has a cylindrical recess 25 to receive the ridged head 19 of the cam follower 18, is rotatably mounted on an adjusting screw 14 which extends rotatably through a bore 23 in the follower and is engaged in a threaded bush 15 secured to the housing 10. The follower 18 has a base portion 21 which is non-rotatably engaged with the body 12 and is connected to the ridged head 19 by a cylindrical portion 22. The cam and follower are held in engagement by a spring 24 acting between the body 12 and the housing 10. The cam 17 may be rotated directly by hand or may be connected by a remote-control linkage to an operating member in the driving compartment of the vehicle.
Patent GB-285052-A (GB)
Title: Articulated headlight bearing device for motor or other vehicles
IPC: B60Q1/068
Filed: 1928-01-03
Abstract: 285,052. Ferrero, R. Feb. 10, 1927, [Convention date]. Vehicle lamps, directing.-In means for dipping headlights, the lamp 14 is carried by a member 10 pivoted at 12 to a fixed member 11, the member 10 being formed with an inclined surface 29 engaging a piston 22 in a cylinder 17 containing a cushion of air 28 above oil or other liquid, so that, when the lamp is dipped by means of a Bowden cable 32, the air is compressed and, on the release of the cable, returns the lamp to the normal position. A leather disc 24 and a felt disc 25 are secured to the piston ring 23 by means of a metal disc 26 and a screw 27. The cylinder 17 is connected by channels 18 with a chamber 19 closed by a cover 20. The members 10, 11 may be formed of aluminium.
Patent GB-537620-A (GB)
Title: Means for mounting the frame of multi-wheel motor vehicles or tractors
IPC: B62D7/14
Filed: 1940-01-03
Abstract: 537,620. Motor vehicle undercarriages. NORTH, O. D., HUGH, P. G., and SCAMMELL LORRIES Ltd. Jan. 3, 1940, No. 193. [Class 108 (ii)] [Also in Group XXXI] The frame of a heavy motor vehicle or tractor is mounted on a longitudinal axis on axle housings and is stabilized by coupling it to one or more torque rods connected to at least one axle housing. In the construction shown applied to a vehicle frame 5 mounted by means of two ball joints 6 on two axle housings 4 as described in Specification 537,619, a torque rod 10 is pivoted on a vertical axis 13 to each axle housing and its inner end is connected to the frame 5 by a ball joint 48. Thus the frame can pivot about the longitudinal axis passing through the ball jo'nts 6, and in order to stabilize it arms 14 fixed to the inner ends of the torque rods are connected by vertical links 42 to the ends of balance levers 37 pivoted at 39 to brackets 40 on the frame. The links 42 comprise pairs of plates Fig. 42a disposed on each side of the frame members 5, and are connected to the levers 37 and arms 14 by ball joints 45, 46. The axle housings pivot about the ball joints 6 for steering and are steered by rods 20 and screw gear 8 mounted on the torque rods as described in Specification, 537,621, [Group XXXI]. The tractor is driven by one, two or more engines 57 through a central gear-box 56 mounted on the frame 5 in a cradle comprising side plates 41 welded to the frame 5 end plates 51 forming frame cross-members, and a base plate 52. The end plates 51 have V-shaped lower edges and their upper edges are arcuate to accommodate the base of the gear-box 56. The ball joints 6 are fixed to the centres of transverse springs 7 having their ends shackled to the side members of the frame 5.
Patent GB-605666-A (GB)
Title: Improvements in or relating to temperature controlling devices
IPC: H05B3/34
Filed: 1946-01-02
Abstract: 605,666. Automatic control systems for electric heaters. THERMEGA, Ltd., and SWINDELLS, V. E. Jan. 2, 1946, No. 200. [Class 38 (iv)] Temperature control.-An electrically-heated article such as a blanket, or flying suit, contains a thermostatic switch 12 controling the current in the heating element 11 and operated by a heating coil 13 in series therewith. Resistances 14, 15 are disposed within the blanket and are successively switchable across the heating coil 13 by auxiliary thermostatic switches 23, 24, operating at successively lower atmospheric temperatures and contained in a pendant housing detachable from the blanket. Falling atmospheric temperatures will successively lower the current in the heating coil 13 to. increase the period during which the thermostatic switch 12 remains closed. One or a plurality of auxiliary thermostatic switches and associated resistances may be employed. A safety thermostatic switch 30 is connected in series with the heating element. Specification 585,590, [Group XXXVII], is referred to.