baber/WOPTO huggingface dataset:
Patent CN-1196799-A (CN)
Inventor: MURPHY JAMES R
IPC: G02B6/036
Filed: 1997-06-27
Abstract: 改进的波导光纤(1)包括中央纤芯(10)区,周围被内包层区(12)包裹着。第二环形区(14)掺杂钽。纤芯掺杂锗。第一环形区(20)位于折射率相对较高的两个相邻的区域之间。两个邻接区(10,20)的折射率都大于中心区(20)。
Patent CN-1253263-A (CN)
Title: 一种电加热方法及装置
Inventor: LIN ZHIQI
IPC: F24H1/20
Filed: 1998-11-09
Abstract: 本发明涉及一种电加热方法及装置,其使用三相电源,三只相线电极均布在壳罩中,利用被加热液体的导电性,直接对液体进行加热。本发明以三相电为电源,其加热速度快、效率高、安全可靠,而且其结构简单、操作使用方便,是一种理想的导电液体电加热方法和装置,适于制做成大功率的电热转换装置,特别适用于安装在电加热锅炉中使用。
Patent CN-1237220-A (CN)
Inventor: MITSUO TAKEDA
IPC: E04G21/04
Filed: 1998-08-31
Abstract: 一种粉粒输送装置,包括悬臂本体4,承载台3和塔柱2,其中悬臂本体4由多个悬臂支承要素15,41,42构成,承载台3支承悬臂本体4并被安装塔柱2上,由伺服电机驱动其转动。每一悬臂结构件的自由端装有伺服电机56,61,这些电机用于转动下一个悬臂结构件。每个要结构件均有皮带传送机66,该皮带传送机将通过料斗5从地面上提升到承载台高度的粉粒输送到悬臂本体66的前端并在此处落下。该处理过程能将粉粒投放到工作区域的任何位置上。
Patent CN-1277401-A (CN)
Title: 生产计划订单系统
Inventor: LIN HUIQUAN
Filed: 1999-06-14
Abstract: 一种执行于一电脑的生产计划订单系统,该电脑包含有一存储器,以及一处理器。该生产计划订单系统则包含一需求数量数据库,系用来记录预定期间内各个星期的需求量;安全库存模组,系用来依据每一星期后的预定数目个连续星期的需求量来计算一星期需求量的平均值,而后再依据该平均值来设定每一星期结束时所应留存的安全库存量;一采购计算模组则用来依据每一星期的需求量,开始时的库存量以及结束时所应留存的安全库存量,来计算各个星期开始前所需购进的购买量。
Patent CN-1256976-A (CN)
Title: 用高含钛磁铁矿生产重介质的方法
Inventor: FENG CHENGJIAN
IPC: B09B3/00
Filed: 1999-12-17
Abstract: 本发明提供一种用高含钛磁铁矿生产重介质的方法。它综合利用了选钛工艺过程中产生的副产物——高含钛磁铁矿,使之变废为宝,不仅能生产出工业用重介质,而且还回收了钛精矿,同时极大减少了这类副产物所占用的土地。本发明生产的重介质成本低,质量好,产出率在80%以上,比重超过4.5,且不会对环境造成污染。本发明经多年研究及工业试验,已形成工业规模,且工艺简单,工艺流程短,充分有效地利用了资源,是一项具有商业应用价值的工艺技术。
Patent CN-1251948-A (CN)
Title: 可伸出的小天线
Inventor: IN HA GAN
IPC: H01Q1/24
Filed: 1999-09-10
Abstract: 提供了一种收发器中的可伸出的小天线。一天线壳体安装在主体壳体上,一螺旋形天线安装在天线壳体中,一可伸出的拉杆天线具有一在伸出状态作为有效天线的鞭状部分,一安装在鞭状部分中的导电芯线,一连接在导电芯线下端的金属管。该导电芯线从该金属管中伸出并缩回到该金属管中。
Patent CN-1287086-A (CN)
Title: 轻质板材自动包装设备用机械手
Inventor: HAN XIUZHI
IPC: B65B35/16
Filed: 1999-09-03
Abstract: 本发明涉及的是一种轻质板材自动包装设备用机械手,所述的机械手包括提升臂和曲臂,采用本设计所述的机械手,可以很容易地将轻质板材移送至半成型的纸箱中;本设计的优点是机构简单、维修方便、成本低。
Patent CN-1247865-A (CN)
Title: 制备喹诺酮和1,8－二氮杂萘酮羧酸的方法
Inventor: NAURIS T
IPC: A61K31/47
Filed: 1999-07-27
Abstract: 制备具有连接到其7－取代基上的外部氨基的抗细菌喹诺酮羧酸和1,8－二氮杂萘酮羧酸的方法,该方法不需使用、和随后除去外部氨基上的保护基团。在优选实施方案中,1,8－二氮杂萘酮羧酸是抗菌素托诺氟沙星(trovafloxacin)。
Patent CN-1295790-A (CN)
Title: 魔芋组培苗批量化生产及组培苗栽培技术
Inventor: WANG LING
IPC: A01H4/00
Filed: 1999-11-14
Abstract: 本发明涉及一种魔芋组培苗批量化生产及组培苗栽培技术,属农业作生物及农业栽培技术。本发明采用相同的培养基按公知的操作条件进行接种和继代培养,仅需45天就一步成苗,每隔20天继代一次,增殖倍数为1:4或1:6。生根培养在12—15天即能出根。洗净根部培养茎的幼苗稳入苗床,在温度为20－30℃、温度80—90%、遮阳度为50%的条件生长,并施加1—6ppm为多效唑及营养液。本发明具有能实现一步成苗、一苗多种、生长周期短、成本低、并能实现批量化组培苗生产和能当年获得50g以上的种竽等优点。
Patent CN-1305635-A (CN)
Title: 关于电热元件的控制装置的改进
Inventor: O'NEILL R A
IPC: H01R13/713
Filed: 1999-04-21
Abstract: 一种无绳电热水器的引入线连接器,其型式适宜与一基部的连接器在遍及360°的两个连接器的相对角度取向的范围内配合,并适宜固定在电器的加热元件最好为厚膜加热元件下侧的中央。有两个加热元件超温控制装置与引入线连接器制成一个整体,被接纳在引入线连接器的模压塑料体部的周边上制出的凹窝内。在一个实施例中,每一个控制装置各有一个双金属片支承在一个弹簧金属支架内,该支架有一制成双稳态、过中心、开关操作机构的整体部分。在另一个实施例中,有一个控制装置具有易熔构件。每一个双金属控制装置的重新设定是根据电器从其基部上提起并重新放回到基部上来作出的。易熔构件控制装置在弹簧张力下保持着易熔构件,因此当它由于超温情况而被熔化时弹簧就被松开,引起一组开关触点的快速打开。蒸汽传感器能直接连接到连接器上。
Patent CR-20150204-A (CR)
Title: Nuevos derivados de piridina
Inventor: BENDELS STEFANIE
IPC: C07D491/10
Filed: 2015-04-20
Abstract: La invención se refiere a un compuesto de la fórmula (I): en la que de R1 a R4 tienen los significados definidos en la descripción y en las reivindicaciones. El compuesto de la fórmula (I) puede utilizarse como medicamento.
Patent CR-20180381-A (CR)
Title: Conjugado persistente de triple activador que activa el receptor de glucagón, glp-1 u gip
Inventor: OH EUH LIM
IPC: C07K14/605
Filed: 2016-12-30
Abstract: La presente invención se refiere a un conjugado de acción prolongada de un agonista triple que tiene actividades en cada uno del receptor de glucagón, GLP-1, y GIP, y uso del mismo.
Patent CR-20210188-A (CR)
Title: Joint for above ground pool frame
Inventor: Huang zhi xiong
IPC: E04H4/04
Filed: 2019-09-17
Abstract: An above ground frame pool (10) includes a frame assembly (20) and a liner (40) supported by the frame assembly (20). The frame assembly (20) includes a plurality of horizontal pipes (22), a plurality of vertical pipes (24), and a plurality of T-shaped joints (30). The joints (30) may lack mechanical fasteners with adjacent pipes or corresponding apertures. The joints (30) may be one-piece or multi-piece structures. Such joints (30) maybe water-resistant and convenient to manufacture, assemble, disassemble, and store.
Patent CR-20230009-A (CR)
Title: Anti-betacellulin antibodies, fragments thereof, and multi-specific binding molecules
Inventor: HAUBST NICOLE
IPC: C07K16/22
Filed: 2021-07-14
Abstract: The present disclosure provides anti-BTC antibodies, methods of producing said antibodies, pharmaceutical compositions comprising said antibodies, and methods of using said antibodies. The present disclosure also provides multi-specific binding molecules, e.g., bispecific antibodies, comprising a BTC binding moiety and an anti-VEGF binding moiety.
Patent EC-SP088098-A (EC)
Title: Nuevos regímenes para anticonceptivos orales monofásicos
Inventor: DAVIS VICTORIA JANE
IPC: A61K31/56
Filed: 2008-01-11
Abstract: La presente invención provee nuevos regímenes para anticonceptivos orales monofásicos
Patent FI-20050748-A (FI)
Inventor: WHEATLEY CHARLES E III
IPC: H04B1/7097
Filed: 2005-07-13
Abstract: An apparatus to increase a radio receiver's immunity to radio frequency interference, the radio receiver receiving a signal, the apparatus comprising:  a switch (1105) coupled to the received signal, the switch (1105) having an open position and a closed position; a resistance (1101), a first end of the resistance (1101) being coupled to the closed position of the switch (1105) and a second end of the resistance (1101) being coupled to a ground potential; an amplifier (1101) having an input coupled to the open position of the switch (1105), for generating an amplified received signal at an output; a controller coupled to the switch (1105), for switching the switch (1105) to the closed position in response to the received signal exceeding a predetermined power level, said received signal conducting through said switch (1105) and said resistance (1101) to ground potential when said switch (1105) is in said closed position; and said resistance (1101) creating an impedance mismatch at the input to said amplifier (1110) when said switch (1105) is in closed position, thereby reducing the gain contributed by said amplifier (1110).
Patent FI-20125463-A (FI)
Inventor: KINNUNEN KARITA
IPC: B32B29/06
Filed: 2012-04-26
Abstract: The invention relates to a hydrophobically sized fibrous web layer, methods for the preparation of a fibrous web or a fibre-based coating, a multilayer board product having at least a middle layer formed of said fibrous web, as well as use of a heat-sensitive surfactant for said methods and products. According to the method microfibrillated cellulose (MFC) and hydrophobic size are brought to a foam with water and the heat- sensitive surfactant, the foam is supplied to a forming fabric of a paper or board machine, dewatered by suction of air through the forming fabric, and dried to a web product. Alternatively the foam may be supplied onto a premade fibrous web and dried to form a coating layer. To prevent gradual degradation of the hydrophobic sizing the hydrophilic functionality of the surfactant contained in the web is finally destroyed by heating. The method uses e.g. AKD-based surfactants with a hydrophilic moiety which is decomposed by heat. If pulp of a greater fibre length, such as CTMP, is also included, a high bulk in combination with a high Scott bond value is achieved, to provide improved wet and dry tensile strength for the paper and board products.
Patent FI-20165733-A (FI)
Inventor: TOUKONIITTY BLANKA
IPC: C11B11/00
Filed: 2016-09-30
Abstract: Present invention relates to a novel process for purification of lipid material for further use as such as e.g. a source of fuel or chemicals.
Patent GB-1050409-A (GB)
IPC: C23G5/00
Abstract: 1,050,409. Cleaning germanium; vapour depositing titanium. ASSOCIATED SEMI-  CONDUCTOR MANUFACTURERS Ltd. July 12, 1965 [Sept. 4, 1964], No.36290/64. Headings C7E and C7F. A layer of tetragonal GeO 2  on a Ge body is removed by reduction with Ti and the reaction products removed. The GeO 2  layer may be formed by the process disclosed in Specification 976559 and Specification 1018131. A layer of Ti is vacuum deposited on the GeO 2  e. g. to a thickness of 0À6 microns for the removal of 1 micron of GeO 2 . The Ti may be deposited through a mask to produce a required pattern or the pattern may be formed by a photoresist technique. The Ti coated Ge body is heated at 540‹C or 600‹C in argon and the TiO 2  formed, together with amorphous Ge and excess Ti is removed by washing with concentrated HF.
Patent GB-1051323-A (GB)
IPC: G03G15/28
Abstract: 1,051,323. Photographic projection-printing apparatus; electrophotography; optical apparatus. AGFA A. G. Dec.16, 1963 [Dec.18, 1962], No. 49638/63. Headings G2A, G2H and G2J. An optical system for projection printing an opaque original without lateral inversion, preferably in a flow-type xerographic documentcopying apparatus, includes a reflecting objective 42, 43 having its axis parallel to the object 9 and image 34 planes and two inclined plane mirrors 44 and 45. On starting the apparatus, an electric motor drives all the feed rollers to move an original sheet inserted at slot 3 and zinc oxide coated copy material from roll 17 at the same linear velocity. As the leading edge of the original sheet reaches and operates micro-switch 27, roller 22 (together with knife 25) is lowered to start feeding copy material from roll 17. The original is illuminated by tubular lamp 40 having reflector 41 and its moving image is projected, full size, on to the moving copy material at exposure gate 34. The copy material passes to conventional developing 37 and fixing 38 apparatus while the original sheet is turned, about roller 10, towards delivery slot 16. Micro-switch 27 is operated by the trailing end of the original sheet to energize electromagnet 26, so that roller 22 and knife 25 are raised, the latter severing the copy material. The, original and copy may alternatively be carried by rollers before illuminating and exposure slits.
Patent GB-1052272-A (GB)
IPC: B26D1/143
Abstract: 1,052,272. Slicing machines. LAN-ELEC Ltd. Feb. 24, 1964 [March 7, 1963], No. 9126/63. Heading A4C. In a food slicing machine a drive arm 1 has an intermediate pivot 16 whereby reciprocation of the upper end of the arm 1 by means of a motor reciprocates a food carrier adjacent to a slicing blade by means of a peg 6 on the carrier which is engaged in a groove 5 in the arm 1, the position of the pivot 16 being adjustable along the arm 1 thereby to vary the stroke of the food carrier. The arm 1 is pivoted to a sleeve 2 guided along a rod 3 and reciprocated with a fixed amplitude by a motor driven connecting rod 4. A collar 7, slidably mounted on the arm 1, carries the pivot pin 16 to be rotatably attached to one arm 8 of a cranked lever 9. The lever 9 is pivoted as at 10, in a fixed plate 11 having recesses 13 in its arcuate end face 12, a recess 13 being selectively engaged by a spring urged pin 15 carried by the other arm 14 of the lever 9 thereby to selectively position the collar 7 and pivot pin 16.
Patent GB-1052441-A (GB)
IPC: H01H9/00
Abstract: 1,052,441. Switch contacts. LICENTIA PATENT - VERWALTUNGS G.m.b.H. July 31, 1963 [Aug. 3, 1962], No. 30356/63. Heading H2B. A contact assembly comprises two pairs of bridging contacts 2 separately sprung 8 and insulated from one another in a support 4 which is pivotally mounted on a shaft 18, extending in the direction of motion of the contact assembly, carried by a carrier 16 (Fig. 2, not shown), mounted for rotary movement about an axis 20 to selectively engage fixed contacts 14, 15, one of which may be a slip ring. The contact bridges 2 are insulated from each other and from support 4 by a combshaped member 3, cups 10 and insulating sleeves 13.
Patent GB-1053507-A (GB)
IPC: C07D457/02
Abstract: 1,053,507. Ergoline derivatives. SOCIETA' FARMACEUTICI ITALIA. April 12, 1965 [April 14, 1964], No. 15455/65. Heading C2C. The invention comprises (a) a process for preparing a 2-nitro-ergoline derivative by nitration of the corresponding ergoline derivative in the presence of a C 1-4  aliphatic carboxylic acid at between 30‹ C. and room temperature, (b) compounds of formula wherein R is a hydrogen atom or a methyl group, R 1  is a group -COOH, -CONHR<SP>1</SP>, -CONR<SP>1</SP>R<SP>1</SP>, -CONHR<SP>11</SP>, -CH 2 OR<SP>111</SP> or -CH 2 NHR<SP>111</SP>, R<SP>1</SP> is a hydrogen atom or a C 1-4  alkyl or hydroxyalkyl group, R<SP>11</SP> is the heterocyclic peptide residue of an ergot alkaloid R<SP>111</SP> is a C 1-10  acyl group and Y is a hydrogen atom or a hydroxy or alkoxy group, and (c) a process for preparing 2-amino-ergoline derivatives by hydrogenation of a 2 nitro-ergoline. 2-Acylamino-ergolines are prepared by acylation of 2-amino-ergolines. The compounds of the invention have spasmolytic and hypotensive activity and may be used in pharmaceutical compositions in combination with a carrier.
Patent GB-1053677-A (GB)
IPC: B21D51/44
Abstract: 1,053,677. Making lids. G. E. CHARLES. Dec. 23, 1963 [Dec. 21, 1962], No. 48345/62. Heading B3A. [Also in Division B8] A method of making a rim R, Fig. 6, and a lid L for a container 11 comprises pressing a circular sheet metal blank to form a disc 7, Fig. 2, having a flange 8 with a rim 9 in which there is a channel 10, and severing the flange 8 in a plane below the bottom of the channel 10. The outer edge 12 of the rim R is then turned over a lip on the container and the inner edge 8c turned outwardly. A rolled edge 13 is formed on the lid L.
Patent GB-1053721-A (GB)
IPC: H04L13/06
Abstract: 1,053,721. Magnetic switches. SCM CORPORATION. March 18, 1963 [April 3, 1962], No. 10548/63. Heading H2B. [Also in Divisions B6, G4 and H4] A contact unit employed in a teleprinter comprises gold-plated iron contacts 456, 459 in a glass capsule 146, Figs. 28, 29 (not shown). A bar magnet 457 is mounted with its axis perpendicular to rod 446. The rod is rotated through a small angle on depression of a teleprinter key, causing the contacts to open or shut. There are six such contact units associated with each key.
Patent GB-1225261-A (GB)
IPC: A63H33/04
Filed: 1968-02-01
Abstract: 1,225,261. Magnetic structural toy. S. C. MORTON. 29 April, 1969 [1 Feb., 1968], No. 5169/68. Heading A6S. A magnetic structural toy comprises a plurality of elements including some straightsided elements such as cubes and some elements with curved surfaces such as spheres, each element including at least one bar magnet whereby selected elements can be held together by magnetic means to form bodies differing in shape and/or size and including both curvedsurfaced and straight-sided elements which could not be satisfactorily held together without the magnetic means. Many elements, e.g. rectangular blocks 1, 2 and 3 and sphere 4 have bar magnets (5, 6, 7 and 8 respectively) extending through them, the magnet ends being flush with the adjacent elemental surfaces. The elements are made from, e.g. wood or mouldable plastic, and the toy may also include an iron or steel plate 13 or strips of straight or curved lengths of steel or iron wire 11 having spheres 12 fixed to each end. A single bar magnet through each element may be replaced by two or more short bar magnets, e.g. spaced in grooves around the periphery of the element or disposed in alignment as at 9A. A box, formed of or lined with ferrous material may be provided for the elements.
Patent GB-1225533-A (GB)
IPC: H01J29/39
Filed: 1968-09-10
Abstract: 1,225,533. Cathode-ray storage tubes; semiconductor devices. WESTERN ELECTRIC CO. Inc. 10 Sept., 1968 [12 Sept., 1967], No. 42933/68. Headings H1D and H1K. [Also in Divisions G4 and H4] The screen of a cathode-ray storage tube comprises a semi-conductive substrate 36, Fig. 2, of one conductivity type (N), an array of regions 38 of the same conductivity type (N<SP>+</SP>), an array of regions 38 of the same conductivity type (N<SP>+</SP>) but of lower resistivity, and an array of regions 37 of opposite conductivity (P) so connected that each region 38 pairs with a region 37 and the substrate to form a bi-stable element. In plan (Fig. 3, not shown), the screen comprises pairs of columns of N<SP>+</SP> regions alternating with pairs of columns of P regions, the P columns being provided with a resistive coating 39 connecting them to conductors 40 connected to output terminal A, and the N+ columns being provided with a resistive coating 41 connecting them to conductors 41 connected to output terminal B; the resistances of the coatings 39 and 41 are made such that the elements are bi-stable when suitable potentials are applied to terminals A and B. When recording, the cathode 23 of the electron gun is at a potential (shown as - 100 volts) such that the secondary emission ratio of the elements is greater than 1, and if the beam is sufficiently strong it can forward bias the emitter (P region) to inject holes into the base at a sufficient rate to switch the element into its other state. In the initial zero state each emitter is at a potential of - 1À16 volts, and if it is switched to a " one " state it assumes the potential of + 0À25 volt. For reading, the screen is scanned with a beam at a potential between these two values (e.g. a cathode voltage of - 0-5 volt) so that an output pulse is produced when the beam impinges on a " one " element but not otherwise. The reading is non-destructive and in the example shown an input is stored at 2 frames/second and read out for display at 60 frames/second, the screen being restored to zero between successive cycles by opening switch 43. An alternative method of storing the information is to project an optical image on the substrate 36. In one example the substrate is silicon, the resistance layers 39 and 41 are antimony trisulphide, titanium dioxide, or silicon, and insulating coatings 48 for protecting the substrate from electron bombardment are of silicon dioxide.
Patent GB-1225947-A (GB)
IPC: G21C7/10
Filed: 1970-03-09
Abstract: 1,225,947. Reactor control rods. COMMISSARIAT A L'ENERGIE ATOMIQUE. 9 March, 1970 [7 March, 1969], No. 11174/70. Heading G6C. In a nuclear reactor control element, boron carbide is supported inside a container which is vented to permit the escape of helium produced by the reaction The rod is formed by the tube 10, containing carbide, 20 which is urged against the plate 18 by the spring 24. The helium, which collects in chamber 30, passes through the sintered nickel plug 46, along the screw threads 40 and out through the porous weld, 42. The plug 46 may be replaced by a ball valve. In further embodiments, coolant is permitted to enter the tube 10 either through porous plugs or through holes formed in the element casing.
Patent GB-1228902-A (GB)
IPC: D03D25/00
Filed: 1968-04-10
Abstract: 1,228,902. Papermakers felts; wet presses. APPLETON MILLS. 10 April, 1968 [17 April, 1967], No. 17368/68. Headings D1K and D2A. A papermakers felt in the form of an endless belt is normally woven, the weft threads are then subsequently skewed to an angle of up to 80‹ with respect to the warp yarns and the yarns are then stabilised to a degree sufficient to prevent free return of the yarns to then as woven condition without preventing adjustment of the yarns through an angle of at least 10‹. The stabilising may be by means of chemical or physical means such as heat or chemical setting or fueling. A batt of fibres may be needled to one or both faces of the fabric. On the paper makers machine the skewing of the weft threads may be altered to adjust the drainage rate or to clear the belt of fines. The adjustment may be made by tilting one of the rolls of a paper makers machine, only a portion of the width of the belt may be adjusted by replacing the roll with two rolls, only one of which is adjusted, or bowed rolls may be utilised. A guide line is provided on the belt to indicate the skewing of the weft.
Patent GB-1232525-A (GB)
IPC: A01K89/08
Filed: 1969-07-25
Abstract: 1,232,525. Fishing reel. OLYMPIC FISHING TACKLE CO. Ltd. and R. K. SUTZ. 25 July, 1969 [18 Feb., 1969], No. 37570/69 Heading A1A. A hand line reel has a handle 18 at one end. The reel frame is made from two parts 12 and 14 held together by screws 16 and 16a, Fig. 1 (not shown). The reel is designed to be held in either hand and a ratchet change over mechanism is provided to facilitate this. The line is wound on spool 26 which is operated by handle 34. Slide 75 enables the ratchet mechanism (which prevents line being payed out) to be brought in or out of action. Control member 69 enables the ratchet mechanism to be reversed. Holes 104, and 106 in frame 12, enable the fingers to be used for braking the reel. The ratchet mechanism consists of two spring connected pawls 52a, 52b, bearing on ratchet wheel 46, which is attached to spool 26. Control lever 60 which is operated by rotating shaft 38 by means of finger grip 69 determines which of the two pawls interacts with ratchet wheel 46, and hence the direction of operation of the ratchet. The ratchet mechanism can be brought in and out of action by slide 75 operating bar 86 which has camming surfaces 92 bearing on pawl extensions 94, which in turn control the separation of the pawl tips. Locking means 80 and 78 are provided to hold the slide 75 in the ratchet disengaged position. Spring 82 is biased to hold the slide in the ratchet engaged position. Handle 18 may be hollow for storage or filled with buoyant material. A wrist strap 120 is also provided
Patent GB-1233451-A (GB)
IPC: B01D21/00
Filed: 1968-07-02
Abstract: 1,233,451. Filter. M. E. L. EQUIPMENT CO. Ltd. 20 May, 1969 [2 July, 1968], No. 31560/68. Heading B1D. A filter for machine tool-coolant comprises an open tank (1) (Fig. 2, not shown) in which is mounted a dome-like cover 4 whose interior is connected at 10a to a centrifugal suction pump (16) and whose mouth is bridged by a flat annular filter screen 6, of nylon or wire mesh, sandwiched between perforate plates 7, 8 and cleaned by a pair of rotary nozzles, which direct a fraction of filtrate from the pump outlet on to the upper face of the screen. Each nozzle comprises a rubber tube 39, with a row of apertures 41 which are more closely spaced towards the screen periphery, urged by a leaf spring 52, secured to enclosing channel 40, to engage upper plate 8. Elongated open-ended boxes 54 rotate with the nozzles below the screen to prevent solids backwashed from the screen being drawn to an adjacent section of the screen. The nozzles and boxes are mounted for rotation with hollow shaft 20, down which backwashing filtrate is delivered and which is rotated by electric motor (32) through a chain drive round sprocket 30. An endless chain scraper 62..68 removes solids from tank (1), conveying them up end ramp (2). Fig. 5 (not shown) illustrates a T-junction downstream of pump 16, one branch having a spring loaded valve, leading to a filtrate storage tank or the user, the other leading back to shaft 20, this arrangement limiting the backwashing pressure. A single nozzle or several nozzles could be used instead of two. Cover 4 is supported from tank 1 by pipe (9) through which the backwash filtrate is delivered to shaft 20, and may be rotated about the axis of pipe (9) to enable access to the screen, secured by screws 5a and the dome interior.