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| Number | Title | Issue Date |
| 8100676 | Rotor, a method for producing such rotor and a pump comprising such rotor The invention relates to a rotor for a positive displacement rotary pump. The rotor comprises a hub with an aperture and a center axis through aperture and at least 2 lobes radially extending from hub and in a direction essentially perpendicular to the axis of hub. ... | 01/24/2012 |
| 7442019 | Stator of a moineau-pump A Moineau stator includes a tube (10) having lobes (3) arranged in a configuration which is adapted to interact with a rotor and formed through a hydroforming process. ... | 10/28/2008 |
| 7407372 | Progressing cavity pump or motor A progressing cavity pump or a motor includes, in one embodiment, an outer tube 12, an inner tube 14, and a plurality of apertures 16. A pair of annular seal glands 18 seal the stator material to the outer tube. The stator material is inj... | 08/05/2008 |
| 7396220 | Progressing cavity stator including at least one cast longitudinal section A progressing cavity stator and a method for fabricating such a stator are disclosed. Exemplary embodiments of the progressing cavity stator include a plurality of rigid longitudinal stator sections concatenated end-to-end in a stator tube. The stator sections are r... | 07/08/2008 |
| 7354258 | Stator for an eccentric single-rotor screw pump and method for its production Stator for an eccentric single-rotor screw pump has a casing made of steel or the like and a helical elastomer lining. Stator and a method for its production are described which can also be made with larger lengths at low production costs. Stator is composed of at l... | 04/08/2008 |
| 7335005 | Gear pump with prestressed gear teeth A gear pump, in particular for pumping material such as rubber mixes, includes an enclosure in which a central gear wheel and two peripheral gear wheels rotate. Teeth of the central gear wheel mesh with teeth of both peripheral gear wheels to pump material from an i... | 02/26/2008 |
| 7329106 | Stator for an eccentric screw pump or an eccentric worm motor operating on the moineau principle The invention relates to a stator for an eccentric screw pump or an eccentric worm motor, including an outer tube that is provided with a lining of rubber or a rubber-like material and has a hollow space or cavity, in the shape of a double or multiple spiral, for ac... | 02/12/2008 |
| 7316548 | Stator for an eccentric screw pump or an eccentric worm motor operating on the Moineau principle The invention relates to a stator for an eccentric screw pump or an eccentric worm motor having a stator, including an outer tube that is provided with a lining of rubber or a rubber-like material and has a hollow space, in the shape of a double or multiple spiral, ... | 01/08/2008 |
| 7311077 | Rotary positive displacement machine with orbiting piston A casing has a circular cylindrical internal surface delimiting an operating chamber. An orbiting piston is mounted so as to orbit about a chamber axis which is the axis of the internal surface. The orbiting piston has a circular cylindrical external surface, a gene... | 12/25/2007 |
| 7192260 | Progressive cavity pump/motor stator, and apparatus and method to manufacture same by electrochemical machining Electrochemical machining is used to generate the helical lobe profiles of the stator of a progressive cavity pump or motor. A thin, elastomeric liner, of uniform thickness is bonded either to the interior of the stator, or to the exterior of the rotor. Where the el... | 03/20/2007 |
| 7153112 | Compressor and a method for compressing fluid A compressor and a method for compressing fluid according to which a liner is disposed on the inner wall of a housing defining a bore. At least one slot and at least one discharge port are provided in the liner. A rotor is rotated in the housing with its outer surfa... | 12/26/2006 |
| 7137795 | Stator for eccentric spiral pump A stator for an eccentric spiral pump comprises a hollow body of an elastic material which has a casing comprising a plurality of segments extending in a longitudinal direction of the casing. Adjacent segments are interconnected along longitudinal sides at variable ... | 11/21/2006 |
| 7131781 | Keyboards A keyboard. A keyboard subassembly is disposed on a base and moves between a first position and a second position. The keyboard subassembly provides a first angle of elevation when in the first position, and a second angle of elevation when in the second position. T... | 11/07/2006 |
| 7131827 | Stator for an eccentric screw pump or an eccentric worm motor operating on the moineau principle The invention relates to a stator for an eccentric screw pump or an eccentric worm motor, including an outer tube that is provided with a lining of rubber or a rubber-like material and has a hollow space or cavity, in the shape of a double or multiple spiral, for ac... | 11/07/2006 |
| 7093336 | Method for drop-in assembly of a futon sofa bed The futon sofa bed frame featuring a quick assembly system and method for fitting the back-deck into position between the arm panels. A futon sofa bed frame featuring a quick assembly system and method for attaching the seat-deck to the back-deck that may be convert... | 08/22/2006 |
| 7083401 | Asymmetric contouring of elastomer liner on lobes in a Moineau style power section stator The inventive stator includes a helical cavity component made from a material chosen to reinforce an elastomer liner deployed thereon. The contouring of the elastomer liner is asymmetrical, such that the elastomer liner is relatively thick on the loaded side of a lo... | 08/01/2006 |
| 7014417 | Auto suction hybrid pump A hybrid pump (1) with a housing (2) comprising at least one suction port (10) and at least one pressure port (11). A rotor (5) is eccentrically arranged in the housing chamber (3) which is substantially enclosed in a circul... | 03/21/2006 |
| 6938670 | Method and apparatus for manufacturing supercharger rotor A method for manufacturing a supercharger rotor by casting a profile portion of a supercharger rotor and a shaft penetrating the same, having the steps of: first cutting a left and right helical cross portion on a surface of the shaft connected to the profile portio... | 09/06/2005 |
| 6905319 | Stator for down hole drilling motor An improved down hole drilling motor suitable for drilling applications. The down hole drilling motor comprising a stator disposed in the tubular housing. The stator includes an internal cavity having one or more lobes. A rotor operatively positioned in the cavity o... | 06/14/2005 |
| 6881045 | Progressive cavity pump/motor A progressive cavity pump or motor, particularly suitable for hydrocarbon recovery operations, includes a rotor 20 and a stator 10. Fluid pressure in cavities between the stator and the rotor create torque which rotates the bit. An interior surface of ... | 04/19/2005 |
| 6716008 | Eccentric screw pump with expanded temperature range An eccentric screw pump or motor which includes; stators (3) having an elastic flexible coatings (32) which forms a helical bore with teeth (37) and tooth gaps (38) and a rotor (4) disposed for rolling movement in the bore and bein... | 04/06/2004 |
| 6666668 | Stator with rigid retaining ring On an eccentric screw pump or an eccentric screw motor, both the outer wall and the inner wall of the jacket (21) have a helicoid form. In order to stabilise the cross-sectional profile of the jacket (21) in the vicinity of the ends and to allow it to be ... | 12/23/2003 |
| 6659065 | Flexible vane rotary engine An internal combustion rotary engine that employs resilient, flexible vanes attached to a rotor that spins within an oval cavity in a housing. The vanes, which are long enough to extend slightly radially from the rotor by a distance beyond the interior su... | 12/09/2003 |
| 6604922 | Optimized fiber reinforced liner material for positive displacement drilling motors A method of forming a stator for a positive displacement motor. The method includes forming a liner that includes at least two resilient layers and at least one fiber layer, and the at least two resilient layers are positioned so as to enclose the at leas... | 08/12/2003 |
| 6604921 | Optimized liner thickness for positive displacement drilling motors A stator for a positive displacement motor including an external tube. The external tube includes an outer surface and an inner surface, and the inner surface includes at least two radially inwardly projecting lobes extending helically along a length of t... | 08/12/2003 |
| 6461128 | Progressive cavity helical device A progressive cavity helical device which includes a stator with an internal helical cavity. A helical rotor operates within the internal helical cavity of the stator. The rotor has a mandrel of metal, plastic or composite material and an outer covering o... | 10/08/2002 |
| 6336796 | Progressive-cavity pump with composite stator and manufacturing process A progressive-cavity pump intended to impart energy to a fluid, includes at least a casing (1), a stator (2) and a rotor (3) arranged in the stator. The casing has at least two parts, a first part (2a) made of a material of low elasticity and a second par... | 01/08/2002 |
| 6299422 | Fluid pump with a flexible toothed belt A fluid pump includes a fluid-tight housing containing two spaced, externally-toothed pulley wheels, an internally-toothed drive belt that wraps around and engages the teeth of the two pulley wheels and moves as they rotate, and a guide block in the space... | 10/09/2001 |
| 6264450 | Flexible vane pump A pump has a rotor with two or more flexible vanes forming one or more compartments between adjacent vanes. The rotor is mounted offset relative to a rotor sleeve such that the volume of the compartments varies as the rotor rotates in the sleeve. Incoming... | 07/24/2001 |
| 6220838 | Progressive cavity pump with meltable stator The invention comprises a progressive cavity pump for pumping a flowable explosive composition or other heat-sensitive material comprising an inlet and an outlet; a stator that is meltable at or above a selected maximum pump operation temperature; a rotor... | 04/24/2001 |
| 6213740 | Flexible impeller pump having a transparent safety cover A flexible impeller pump having a transparent safety cover. The pump includes a flexible impeller and a housing having a pump and cover. The pump end cover comprises a transparent safety cover which is capable of attachment to the housing. A transparent h... | 04/10/2001 |
| 6162032 | Elastomeric stator for eccentric spiral pumps An elastomeric stator for an eccentric spiral pump is provided. The stator has a lining that is made of elastomeric material and has a hollow chamber that serves for accommodating a rotor. The hollow chamber has a double or multiple spiral configuration. ... | 12/19/2000 |
| 6158988 | Method of producing elastomeric stators for eccentric spiral pumps The method of producing an elastomeric stator, and a stator produced by such method are provided. On its outside, the stator has a metallic spiral body, the shape of which corresponds to that of a hollow pump chamber. Elastomeric material is injected into... | 12/12/2000 |
| 6155807 | Eccentric worm pump An eccentric worm pump has a tubular stator extending along a main axis and having an intake side and an output side, an eccentric worm fitting in the stator and centered on a rotor axis offset from the main axis, an intake housing forming an intake compa... | 12/05/2000 |
| 6102681 | Stator especially adapted for use in a helicoidal pump/motor A fluid handling device such as a helicoidal pump or motor having a stator formed by an elastomer material in which a plurality of fibers are encapsulated. Preferably, the fibers form a network of interlaced fibers extending in two or more directions. The... | 08/15/2000 |
| 6019583 | Reverse moineau motor A downhole submersible fluid pump having a progressive cavity motor section driving a rotary pump such as a centrifugal or axial pump. In the motor section an inner helical member is fixed relative to an outer rotatable member having helical threads. By f... | 02/01/2000 |
| 5988998 | Rotary pump having a reinforced flexible annular diaphragm A rotary diaphragm fluid pump includes a rigid tubular body with internal annular groove, a tubular flexible diaphragm whose central portion is caused to orbit by an eccentrically driven bearing. Preferably the diaphragm is a moulding which features an el... | 11/23/1999 |
| 5961308 | Cylindrical pump device having a flexible blade member A cylindrical pump device comprises a cylindrical housing and a cylindrical rotational member disposed in the cylindrical housing for rotation around the axis of the cylindrical housing. The cylindrical rotational member has a solid cylindrical wall, a ce... | 10/05/1999 |
| 5879147 | Actuator driven by pressure change of fluid The actuator of the present invention is driven by pressure changes of the fluid. A first structural body as an elastic body includes a plurality of pressure chambers along an axis direction. The first structural body passes through a second structural bo... | 03/09/1999 |
| 5807087 | Stator assembly for a progressing cavity pump A stator assembly is provided for use in a progressing cavity pump. The assembly includes a tubular pump barrel in which are slidably positioned a plurality of cup-like spacers. Each spacer has a tubular wall, an inlet end with an internal annular flange ... | 09/15/1998 |
