baber/WOPTO huggingface dataset:
Patent JP-H11509560-A (JP)
IPC: A23L33/20
Filed: 1997-12-18
Abstract: Creatine pyruvates are described which have the general formula (I)wherex=1 to 100y=1 to 10 andn=0 to 10These creatine pyruvates, which are produced by way of the relatively simple reaction of creatine with pyruvic acid, can be used to enhance long-term performance and strength in the field of sport, to reduce weight and body fat in the field of health, to treat conditions of oxygen deficit (ischemia), obesity and overweight, as food supplements and radical scavenger.
Patent JP-2000508780-A (JP)
Title: 揮発性生成物の試料採取のための装置
IPC: G01N1/22
Filed: 1997-11-26
Abstract: (57)【要約】
本発明は、該装置がケーシング、この際該ケーシングは開口端部を有しておりかつ内部空洞を規定しており、この内部空洞は該開口に延びておりかつ前記揮発性化合物を吸着するための材料を含有している、を備えている、表面に適用された揮発性化合物の試料採取のための装置である。前記開口は蓋によって封止されることができ、かつオフ位置で閉鎖されることができ、かつ使用位置で前記表面と接触しているように設計されていることができる。前記装置は、皮膚に適用された香料添加化合物を試料採取するために特に適当である。
Patent JP-H11506091-A (JP)
Title: 搬送及び収集システム
IPC: B65H39/04
Filed: 1997-02-21
Abstract: (57)【要約】
被搬送材（２５０）を搬送方向に移動するために使用される単位化された搬送及び収集システムであって、搬入側と搬出側の終端部分を有する複数の搬送モジュール（Ａ，Ｂ）からなる。各搬送モジュール（Ａ，Ｂ）は、前と後のロール（２１０，２１２，２１０’，２１２’）でガイドされるエンドレス手段（１００，１１０）で構成された搬送手段、該搬送手段を駆動するための駆動手段、予め設定された間隔でエンドレス手段に取り付けられた複数の押圧手段（１０２）からなる。複数の搬送モジュール（Ａ，Ｂ）は、互いに関連する第１搬送モジュール（Ａ）搬入側の終端部分と第２搬送モジュール（Ｂ）の搬出側の終端部分が重複領域（２００）を形成するように配設され、重複領域（２００）の長さが重なっている部分で搬送モジュール（Ａ，Ｂ）の押圧手段（１０２）が被搬送材（２５０’）を挟み、搬送方向後方の搬送モジュール（Ａ）に属している押圧手段（１０２）が、搬送モジュール（Ａ）の前ロール（１０４）に到達して下降する際に、搬送方向とは反対方向に傾斜しつつガイドされる。
Patent JP-H11504213-A (JP)
IPC: G16B15/20
Filed: 1996-04-19
Abstract: Disclosed herein are structure-based modelling methods for the preparation of acetohydroxy acid synthase (AHAS) variants, including those that exhibit selectively increased resistance to herbicides such as imidazoline herbicides and AHAS inhibiting herbicides. The invention encompasses isolated DNAs encoding such variants, vectors that include the DNAs, and methods for producing the variant polypeptides and herbicide resistant plants containing specific AHAS gene mutations. Methods for weed control in crops are also provided.
Patent JP-2000506318-A (JP)
IPC: H05K7/14
Filed: 1997-03-04
Abstract: The claimed corner-profile strip comprises a strip-shaped support section for a lateral housing panel, a strip-shaped spacer section approximately perpendicular to the support section, and a strip-shaped contact section oriented approximately parallel to the support section and inwards away from the spacing section. An advantage here is the single-piece design of the corner strip which combines the functional qualities of a mechanical connecting component for essential housing parts with those of a contact component used for electromagnetically shielding the mounting rack. The all-purpose capability for securing contact spring strips and as a contact counter surface for spring elements reduces the complexity of manufacture and assembly. This means that a corner strip of a single type can be used at each of the four corners of a mounting rack.
Patent JP-H11505481-A (JP)
Title: 連続印刷インク噴射ノズルの洗浄流体装置および方法
IPC: B41J2/165
Filed: 1996-04-09
Abstract: (57)【要約】
流体（液体または水）洗浄（４６）を用い、インクジェットプリンタのカートリッジ（１７）の表面を洗浄する。さらに、ノズルプレート（２４）はノズルに重なり、ノズル列（２３）をインクの飛沫（３２）から保護する。インクジェットプリンタ内で、インク滴はプリンタヘッドのノズルプレートの孔口列から送出される。インク滴が噴出されているとき、インクは孔口の周囲に飛び散ったり付着する。インク滴はノズルに隣接するペーパーウェブ（１４）に付着し、インク滴から生じる霧状のインクは漂遊してノズルプレートの表面に付着する。幾らかのインクはノズルプレート（２４）の後方からノズル孔口列（２３）上に滲出する。インクの付着が粒子を吸着し、ノズル孔口の目詰まりを引き起こし易くなる。インクの付着は流体の流れ（４６）によって洗い流される。この流体はノズル表面全体にわたって流れる。いくつかの実施の形態では、流体はノズル孔口自体に流れる。流体（４６）は水、インクまたは他の液体でもよく、ノズル表面を横切って流れる。また、流体はノズル表面を横切って流れる気流でもよい。
Patent JP-H11506587-A (JP)
Title: 無線通信システムにおけるダウンリンク通信路を確立する装置および方法
IPC: H04J13/00
Filed: 1996-06-03
Abstract: (57)【要約】
無線通信システム（1）は、加入者端末（20）との無線周波数信号の送受信のための中央端末（10）を含むものである。ダウンリンク通信路は、中央端末（10）の送信機（200）から加入者端末（20）の受信機（202）まで確立される。ダウンリンク信号（212）は、無線通信システム（1）のセットアップ時および動作中に、送信機（200）から受信機（202）まで送信される。加入者端末（20）の受信機（202）は、ダウンリンク信号（212）のマスターコード・シーケンスのコードおよび位相を、受信機（202）のスレーブコード・シーケンスのコードおよび位相と比較する。受信機（202）は、スレーブコード・シーケンスをマスターコード・シーケンスとの整合が得られるまで調整する。スレーブコード・シーケンスのマスターコード・シーケンスへの整合は、ダウンリンク通信路の確立を容易にする。
Patent JP-2001518246-A (JP)
IPC: H04R19/04
Filed: 1998-02-19
Abstract: Multiple embodiments of a solid state condenser transducer, and methods of manufacture, are disclosed. The transducer comprises a semi-conductor substrate forming a frame and having an opening, a thin-film cantilever structure forming a diaphragm extending over a portion of the opening, the structure having a proximal portion and a distal portion. The proximal portion is attached to the frame, and the distal portion extends over a portion of the frame. A variable gap capacitor having a movable plate and a fixed plate is provided, wherein the movable plate is disposed on the distal portion of the structure and the fixed plate is disposed on the frame adjacent the movable plate.
Patent JP-2001518182-A (JP)
Title: 向上した低周波数レスポンスのためのフィードバック増幅器をともなった焦電気検出器
IPC: G01J5/34
Filed: 1998-02-27
Abstract: (57)【要約】
焦電気検出器は、負荷抵抗器と非ゼロ周波数で負荷抵抗器の抵抗を乗算処理するフィードバックパスを有する緩衝増幅器の入力とに接続された焦電気検出素子を備える。このフィードバックによって、検出回路の適正な低周波数レスポンスに必要な高い有効負荷抵抗を発生させるように乗算処理された小さい負荷抵抗を用いることができる。
Patent JP-2001518824-A (JP)
IPC: A61F2/00
Filed: 1997-04-15
Abstract: The invention relates to a device for replacing vertebral bones. The device includes an interior hollow body and an exterior hollow body. These hollow bodies can slide into each other coaxially along a central axis and can be moved in relation to one another in the direction of the central axis. The interior hollow body is provided with a catch mechanism on its outer surface. The exterior hollow body includes a hole or bore extending along the central axis. The exterior hollow body also includes at least one elastic element that projects into the bore at its top end. This reduces the diameter of the bore so that the elastic element latches onto the catch mechanism of the interior hollow body, thereby fixing the length of the device in such a way that it is resistant to compression.
Patent JP-2001523401-A (JP)
Title: 半導体スイッチ装置およびその製造
IPC: H01L29/868
Filed: 1999-02-04
Abstract: (57)【要約】
NPNトランジスタ（T)またはパワースイッチングダイオード(D）のような半導体スイッチ装置において、一導電型の多重ゾーン第一領域(1)が、反対導電型の第二領域（2）とスイッチ切り替え可能なpn接合（12）を形成する。本発明によれば、この第一領域（1）は、３つの明確なゾーン、すなわち、低ドープゾーン（23）、高ドープゾーン（25）、そして中間の付加ゾーン（24）を含む。低ドープゾーン（23）は、実質上均一なp型ドーピング濃度（P-）を有している半導体基体部分（11）によって、設けられそして第二領域（2）とpn接合（12）を形成する。明確な付加ゾーン（24）が、低ドープゾーン（23）と高ドープトーン（25）との間に存在する。第一領域（1）に対するこのトリプル-ゾーンの形成により、例えば、装置（T,D）のターンオフの間のフォールタイムとエネルギー消質の点で、スイッチング動作の改善が得られる。非常に低いドーピング（P-）を低ドープゾーン（23）に対して使用できるので、装置（T,D）のオフ状態で、このゾーン（23）、更には付加ゾーン（24）を充分に空乏化できる。その付加ドーピング濃度を有している付加ゾーン（24）は、装置(T,D)がスイッチオフされているとき、低ドープゾーン（23）から残留電荷キャリヤを抽出するパスを提供する。
Patent JP-2000512905-A (JP)
Title: ペルフルオルカーボン共重合体で表面変性した多孔質膜の製造方法
IPC: B01D71/82
Filed: 1998-04-28
Abstract: (57)【要約】
表面をペルフルオルカーボン共重合体組成物で完全に変性させた多孔質膜基体を有する多孔質膜を含む多孔質膜生成物を製造する方法を提供する。この多孔質膜基体にペルフルオルカーボン共重合体組成物を含有する溶液を接触させて組成物を基体表面に結合させる。その基体に、機械的な力を施して過剰なペルフルオルカーボン共重合体組成物を除去し、次いで熱処理する。
Patent MD-20000017-A (MD)
Title: Hydraulic motor
Inventor: BURCIU VITALIE
IPC: F03B17/04
Filed: 2000-01-24
Abstract: The invention relates to the hydraulic motors and may be used in the mechanical engineering, in the heat power and electrical power engineering, agricultural and industrial complex, at mills and oil-mills.The hydraulic motor consists of a vessel with liquid called stator, into which is installed a rotor, of which shaft is fixed into the bearing supports. The rotor axle is placed parallel to and flush level with the stator axle, furthermore the axle spacing depends on the power of the motor. The rotor is provided with a pair of blades of the Zhukosvky type, situated diametrically opposite by twos on the external surface of the rotor and provided with rods, rigidly fixed to the internal surface of one longitudinal edge of the blade, furthermore the rods of the two diametrically opposite blades have their ends articulated by bearings, to the connecting rod, of which ends are provided with bearings freely slipping on the internal surface of the stator. The blades are empty inside, they are hermetically sealed, filled in with air and inert gas under standard pressure and provided with transversal and longitudinal stiffening ribs. One end of the transversal ribs passes through the second longitudinal edge of the blades and it is rigidly connected to a rod-loop, placed at a certain distance from such longitudinal edge depending on the power of the motor, the ends of which are fixed into the bearing supports, rigidly fixed to the rotor external surface and the other end of the transversal ribs is rigidly joined with the rod of the first longitudinal edge of the blade.The result consists in the considerable increasing of the bending moment, rotational speed of the motor, efficiency as well as specific power thereof.
Patent MX-157847-A (MX)
Inventor: DUMONT BERNARD
IPC: F23Q2/52
Filed: 1981-09-04
Abstract: A disposable gas lighter is formed with a liquid-fuel reservoir having a well molded into the housing at an upper portion thereof and provided with a plug member having a plurality of positions including a first position in which a passage is provided into the reservoir, a second position in which the well and the flow can be completely closed off and a third position in which the member is completely clear of the well to enable the well to serve to accommodate a valve system and a flow control device for the lighter. The axially displaceable member, having the aforementioned three positions, may be molded as part of the lighter housing and the well and can be broken loose when it is necessary to fill the reservoir.
Patent MX-158410-A (MX)
Inventor: WHALEY HUBERT L
IPC: E21B36/00
Filed: 1983-10-31
Abstract: A coupon (10, 12) is bonded to a component (20) using a bonding agent which is capable of withstanding temperatures only up to a selected temperature above which the bonding agent no longer holds the coupon to the component. The component (20), during an operation, is intended for exposure to temperatures not above the selected temperature. An exposure of the component (20) to the elevated selected temperature is identified by the fact that the coupon (10, 12) is no longer bonded to the component after termination of the operation. When the component (20) is provided with insulation, the selected temperature is chosen to correspond to a temperature at which the insulation fails to determine the integrity of the insulation after the operation. The coupon (10, 12) may be bonded to an exterior or interior surface of the component. With an exterior bonded coupon, visual inspection is sufficient. With an interior bonded coupon, detection means such as ultrasonic instrumentation is utilized to determine the presence or absence of the bonded coupon.
Patent NZ-219924-A (NZ)
Title: Rotating anti-scaling device for top of fence
Inventor: FRANCIS J R
IPC: E04H17/00
Filed: 1987-04-08
Abstract: A rotary anti-scaling device comprises a pair of substantially identical halves (2) connected together at a relative displacement of 180 DEG  about a central transverse axis through the halves (2) to form a unitary spike. Each half (2) includes a central body portion (4) with a central, transversely-extending bore (10) therethrough permitting rotation of the unitary spike on an associated mounting bar (36), one or more projections (6) extending from opposed ends of each body portion (4) and at least one of the body portions (4) having means (28,30) formed thereon for co-operating with an adjacent spike to locate said spike in a position displaced angularly about its transverse axis relative thereto.
Patent NZ-221349-A (NZ)
Title: Compositions for boiler scale inhibition comprising a low molecular weight (meth)acrylic acid polymer and a (meth)acrylic acid polymer more than double the molecular weight
Inventor: MORSE LEWIS D
IPC: C02F5/12
Filed: 1987-08-05
Abstract: A method of inhibiting scale in boilers is disclosed whereby high and low molecular weight blends of acrylic acid/acrylamide-type polymers are used to prevent boiler scaling. These polymer blends demonstrate synergistic hydrothermal stability and threshold scale inhibition characteristics at elevated temperatures and pressures.
Patent NZ-224197-A (NZ)
Title: Indigestible shortening compositions
Inventor: JANDACEK RONALD JAMES
IPC: A23D9/00
Filed: 1988-04-08
Abstract: Plastic shortening and other food compositions which comprise an edible oil and a fatty acid ester of sucrose wherein the fatty acid groups consist essentially of short chain fatty acid radicals containing from 2 to 10 carbon atoms and long chain fatty acid radicals containing from 20 to 24 carbon atoms in a molar ratio of short chain:long chain radicals of 5:3 to 3:5, the said esters having a degree of esterification of about 7 to 8. The edible oil can be a triglyceride oil or a nondigestible oil.
Patent NZ-230451-A (NZ)
Title: Sulphonamide derivatives and pharmaceutical compositions thereof
Inventor: WITTE ERNST-CHRISTIAN
IPC: C07C311/17
Filed: 1989-08-28
Abstract: The present invention provides sulphonamides of the general formula:    <IMAGE>  (I)  wherein R1 and R2, which can be the same or different, are hydrogen or halogen atoms or C1-C6-alkyl, trifluoro-methyl, cyano, carboxyl, alkoxycarbonyl, aminocarbonyl, N-alkylaminocarbonyl or N,N-dialkylaminocarbonyl radicals or, when R1 and R2 are alkyl radicals ortho to one another, R1 and R2 together with the carbon atoms to which they are attached, form a saturated or unsaturated C5-C7-alkylene ring, R3 is a hydrogen atom, an alkyl radical containing up to 6 carbon atoms, an acyl radical, a phenylalkyl or phenylalkenyl radical, the phenyl moiety of which can be substituted by halogen, alkyl or trifluoromethyl, C is a -(CH2)m-radical, in which m is 0, 1, 2 or 3, or a branched C2-C5-alkylene radical, whereby a methylene radical -CH2-of the group C can be replaced by an oxygen or sulphur atom or by a hydroxymethylene radical -CHOH-or carbonyl group -CO-, B is a 1,2-, 1,3-, 1,4-cyclohexylidene or 1,2- or 1,3-cyclopentylidene radical.
Patent NZ-241526-A (NZ)
Title: N-((hetero) aromatically substituted) phenyl carbamate derivatives and biocidal compositions
Inventor: TERUMASA KOMYOJI
IPC: C07D263/16
Filed: 1992-02-05
Abstract: A novel N-phenylcarbamate compound or its salt where possible, which is useful as the active ingredient of a biocidal composition for control of harmful organisms, is represented by the following general formula (I): <CHEM> wherein R<1> is unsubstituted or substituted alkyl; R<2> is H, unsubstituted or substituted alkyl, alkenyl, alkynyl or cycloalkyl, or -COX<1> wherein X<1> is unsubstituted or substituted alkyl, alkenyl, alkynyl, cycloalkyl or alkoxy; Z is -CH2S-, -SCH2-, -CH2O-, -OCH2-, -CH2CH2-, -CH=CH-, -C IDENTICAL C-, -CH2SO-, -CH2SO2-, -CH2SCH2-, or -CH2O-N=C(R<4>)-; R<3> is unsubstituted or substituted phenyl, pyridyl, benzothiazolyl, benzoxazolyl, benzimidazolyl, imidazopyridyl, naphthyl, pyrimidinyl, thienyl, furyl, thiazolinyl, oxazolinyl, pyrazinyl, thiazolyl, oxazolyl, imidazolyl, pyrazolyl, quinolyl, indolyl, pyrrolyl, benzofuryl, benzothienyl, indanyl, tetrahydronaphthyl, dihydrobenzofuryl, dihydrobenzothienyl, benzoxazinyl, benzothiazinyl or benzoyl.
Patent NZ-244626-A (NZ)
Title: Scissors having elastically deformable covering rings in handle finger apertures for right- or left-handed operation
Inventor: BORNANCINI JOSE CARLOS MARIO
IPC: B26B13/20
Filed: 1992-10-06
Abstract: PCT No. PCT/BR92/00017 Sec. 371 Date Apr. 7, 1994 Sec. 102(e) Date Apr. 7, 1994 PCT Filed Oct. 7, 1992 PCT Pub. No. WO93/06977 PCT Pub. Date Apr. 15, 1993Handles for cutting instruments such as scissors are described, each handle being made of a relatively rigid plastics material and being provided in its finger-receiving hole portion (8;8') with a lining ring (15;15') of elastically deformable material, such as natural or synthetic rubber. Such elastically deformable ring permits the scissors to adapt itself to the fingers of the user, independently of their size or whether the user is right- or left-handed.
Patent NZ-320006-A (NZ)
Title: An adjuvant composition comprising hyaluronic acid for gene therapy either in the sense or antisense direction
Inventor: RAKOCZY PIROSKA ELIZABETH
IPC: A61K48/00
Filed: 1996-10-22
Abstract: A method and composition for gene therapy comprising (a) an adjuvant selected from the group consisting of hyaluronic acid and derivatives thereof; (b) a pharmaceutically-acceptable carrier; and (c) a nucleic acid comprising a polynucleotides selected from the group consisting of a polynucleotides which is antisense to a target polynucleotides and/or a sense polynucleotides encoding a desired specific protein. The composition is suitable for the treatment of retinal diseases caused by neovascularisation.
Patent NZ-334804-A (NZ)
Title: Windshield repair apparatus including bridge and method
Inventor: PETERSEN PAUL S
IPC: B29C73/02
Filed: 1997-10-02
Abstract: Provided is a windshield repair apparatus (20) includes a bridge (22) for holding an injector (26) adjacent to a break area (32) of a windshield (30). The bridge (22) includes a suction cup (24) for mounting the bridge (22) to the windshield (30). The bridge (22) includes a pivotally mounted arm (50) which allows for pivotal movement of the injector (26) away from the break area (32), and a registration system (76) which allows for accurate replacement of the injector (26) over the break area (32) following pivotal movement back toward the break area (32). A ball plunger (80) and detent mounting arrangement between the pivotally mounted arm and a remainder of the bridge (22) allows for registration. The suction cup includes a vacuum pump (90) for withdrawing air from beneath the suction cup (24). The injector (26) includes a clip securing a stopper to a body of the injector. The stopper includes peripheral lip seal at a first end of the stopper which is received by the body. The arm also is pivotally moveable toward and away from the windshield and is controlled by a threaded adjustment mechanism.
Patent NZ-335653-A (NZ)
Title: Electrobraid fence
Inventor: WHITE ERIC
IPC: H01B5/10
Filed: 1997-11-03
Abstract: A light weight, strong and flexible, braided electrical fence rope 1, for fences to contain livestock and keep unwanted animals out, combines in its outer braided jacket 2 electrically conductive elements 3A with high strength non-conductive elements 3B in a double helix configuration.  Each of non-conductive elements 3B are a plurality of synthetic fibres and each of conductive elements 3A is at least one electrically conductive wire.  Conductive and non-conductive elements 3A, 3B are braided to form the cylindrical tightly woven braided exterior layer such that the conductive elements are helically wound with opposed orientations.  Outer braided jacket 2 will preferably surround an inner core 5 of non-conductive high strength elements. The high strength non-conductive elements and the physical properties of the braided rope construction provide inherent strength and flexibility properties to the fence rope.  Conductive elements 3A in outer braided jacket 2 are selected to provide an effective electric shock when contacted by an animal.  This electric fence rope combines barrier strength and psychological deterrence to both domestic and wild animals.
Patent NZ-503366-A (NZ)
Title: High viscosity liquid controlled delivery system having a viscosity over 5000 cP at 37C
Inventor: TIPTON ARTHUR J
IPC: A61L27/00
Filed: 1998-09-08
Abstract: The use of a non-polymeric, non-water soluble, high viscosity liquid carrier material, such as sucrose acetate isobutyrate, having a viscosity of at least 500 cP at 37°C that does not crystallize neat under ambient or physiological conditions, in the manufacture of a medical or surgical implant, film or graft composition for treating a patient in need thereof; and a method of treating a wound in a non-human patient comprising administering to a wound site in the patient an effective amount of the surgical implantable or sprayable non-polymeric material.
Patent NZ-506050-A (NZ)
Title: Inhalation apparatus for powder medications
Inventor: GOLDEMANN RAUL
IPC: A61M15/00
Filed: 1998-12-22
Abstract: The inhalation apparatus for powder medications comprises a housing (1) with a rotational dosing ball (15) that is assigned to the orifice of the powder reservoir (12) located in the housing, that is manually actuated and that has a peripheral dosing cavity (17) to accommodate a dose of powder. The dosing ball is connected to a torsion spring (16) and also has a stop piece (not shown). In addition, a pivotal release flap (14) with a movable stop (14a) is assigned to said dosing ball. The dosing ball is prestressed by turning it until the slot of its stop piece reaches the movable stop of the release flap and is subsequently released by a rotation of the release flap caused by breathing. The medication is released from the dosing cavity as a result of the abrupt deceleration of the dosing ball due to the halting of the stop piece on the bottom of the housing and extensively distributed in the respiratory airflow. The medication can thus be fully inhaled in synchronization with breathing. Overdose or multidose is excluded.
Patent NZ-507888-A (NZ)
Title: Mutations in bovine milk diglycerol-o-acyltransferase (DAGT1) affecting a quantitative trait locus (QLT) resulting in altered milk characteristics such as increased protein and decreased fat content
Inventor: GEORGES MICHEL ALPHONSE JULIEN
IPC: C07K14/47
Filed: 2000-10-31
Abstract: A method of determining genetic merit of a bovine with respect to milk composition and volume, which comprises the step of determining the DGAT1 genotypic state of the bovine.  Also described is the use of the DGAT1 sequences in identification of genetic markers and a transgenic non-human animal where additional copies of the gene encoding DGAT1 have been inserted as a transgene.
Patent NZ-509958-A (NZ)
Title: Reciprocating machine with two sub-chambers
Inventor: GALBRAITH PETER AFTON
IPC: F01P3/20
Filed: 1999-09-01
Abstract: A reciprocating machine includes a housing (12) and piston means (20) that are cyclically relatively displaceable along an axis (11) to define a variable volume working chamber (50). There is further provided air inlet means and fuel inlet means (100) admitting air and fuel to the working chamber for forming an ignitable mixture after compression of the air therein, and means to exhaust combustion products from the working chamber. The variable volume working chamber (50) includes at least two sub-chambers, a combustion chamber (54) and a main chamber (52) mutually displaced on the axis (11) and in communication at a cross section (53) at which gas in the combustion chamber (54) may expand at least partially laterally as it flows from the combustion chamber (54) into the main chamber (52). The air admission means, the exhaust means and the chambers (52, 54) are arranged so that a swirl of gas is generated and maintained about the axis (11) in both chambers (52, 54) during operation of the machine. The combustion chamber (54) is sealed and defined laterally and at one end by integral heat resistant and/or low thermal conductivity wall structure (40) having a surrounding heat insulation jacket (48) and associated heat dissipation means (47, 49) arranged so that, during operation of the machine, the surfaces (42a, 44) of the wall structure bounding the combustion chamber are maintained at a temperature which is substantially higher than wall surfaces (31) bounding the main chamber (52).