Did You Know...
...that the Band-Aid Bandage was invented by a Johnson & Johnson employee whose wife had cut herself? Earl Dickson's wife was rather accident prone, so he set out to develop a bandage that she could apply without help. He placed a small piece of gauze in the center of a small piece of surgical tape, and what we know today as the Band Aid bandage was born!
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| Number | Title | Issue Date |
| 8109748 | Gear tooth and external gear pump A gear tooth including a concave base connected to its starting point at the root of the adjacent tooth and a top connected to the base via a first transition point. The top of the tooth includes two convex segments connected via a second transition point causing a ... | 02/07/2012 |
| 8087914 | Positive displacement pump with improved rotor design An improved positive displacement pump provides improved wear characteristics. Specifically, rotor pads are provided on faces relative to an internal portion of the rotor housing as it relates to an end wall and a rear side of a cover plate. The rotor pads preferabl... | 01/03/2012 |
| 8087913 | Gear pump with unequal gear teeth on drive and driven gear A gear pump comprises a first gear to be connected to a source of drive, and having a first plurality of gear teeth. A second gear has a second plurality of teeth engaged with the first gear teeth. The first gear teeth contact the second gear's teeth on a contact fa... | 01/03/2012 |
| 7866966 | Optimized helix angle rotors for Roots-style supercharger A method of designing rotors for a Roots blower comprising a housing having cylindrical chambers, the housing defining an outlet port (19). The blower includes meshed, lobed rotors (37,39) disposed in the chambers, each rotor including a plurality N of... | 01/11/2011 |
| 7794218 | Roots type pump and fuel cell system There is disclosed a Roots type pump in which two rotors are rotated synchronously in a pump chamber to compress fluid therein, wherein respective stop positions of the rotors in the pump chamber at a time of stopping the pump are determined independently of each ot... | 09/14/2010 |
| 7479000 | Gear pump A pump comprises a driving rotor and a driven rotor that are positioned in a housing such that, as the driving rotor and the driven rotor rotate, the teeth of the driving rotor and the teeth of the driven rotor mesh to form a positive displacement seal. The teeth of... | 01/20/2009 |
| 7395948 | Multiple tank fluid pumping system using a single pump Disclosed is a system for pumping of fluid by a single pump from a plurality of storage tanks in situations where some of the tanks should be pumped simultaneously at predefined, equal or unequal flow rates, and where some of the tanks should be pumped sequentially,... | 07/08/2008 |
| 7320579 | Roots type fluid machine A roots type fluid machine includes a housing, a pair of parallel rotary shafts and two-lobe rotors. Each rotor includes two lobe portions and two well portions. Each lobe portion has a profile of convex arc with a radius R and each well portion has a profile of con... | 01/22/2008 |
| 7300267 | Unit for delivering fuel to an internal combustion engine A roller cell pump having a shaped sliding surface composed of elliptical portions results from two different equations. The function of the unit is improved because the equations are modified and include adaptable parameters, so that by adaptation of the parameters... | 11/27/2007 |
| 7255545 | Double-lobe type rotor design process A double-lobe type rotor design process includes a process for forming a defined rotor and a process for forming a conjugate rotor, wherein the defined rotor and the conjugate rotor intermesh and conjugate to each other. The rotor profile curves suitably for the com... | 08/14/2007 |
| 7232298 | Screw compressor in which the trailing flanks of the lobes of at least one rotor body are beveled at an end surface of the rotor body near the outlet port A helical screw rotor compressor is provided which includes a rotor housing that includes a barrel wall between two parallel end walls, an inlet port at a first end and an outlet port at a second end. The compressor has an internal shape corresponding to two paralle... | 06/19/2007 |
| 7226280 | Roots vacuum pump In a Roots vacuum pump, an inlet port is located at a position n spaced by a positive displacement angle of 120° in one direction from a center of each rotational axis relative to an imaginary line m connecting rotor axes. An outlet port is located at a position o ... | 06/05/2007 |
| 7188621 | Portable ventilator system A portable ventilator uses a ROOTS-type blower as a compressor to reduce both the size and power consumption of the ventilator. Various functional aspects of the ventilator are delegated to multiple subassemblies having dedicated controllers and software that intera... | 03/13/2007 |
| 7178420 | Ring gear A ring gear includes teeth (10) and tooth gaps (12), in which the teeth (10) can be brought vie tooth flanks (14) into engagement with a corresponding pinion. The tooth flanks (14), after a final engagement point (16) of the... | 02/20/2007 |
| 7128543 | Compressor machine with two counter-rotating rotors The compressor machine has two rotors rotating in opposite directions, which are fitted to two parallel, spaced apart shafts mounted in a housing. One of the shafts is driven directly and the other by intermeshing toothed gears mounted on the shafts. The housing has... | 10/31/2006 |
| 7111606 | Rotary positive displacement device A device to convert energy having exterior and interior rotors where the number of legs (Λ) of an interior rotor divided by the number of chambers (X) defined by the fins of the outer rotor is equal to the effective radius of the inner reference circle ri | 09/26/2006 |
| 7041019 | Automotive compressor having a simple waterproof structure for a bearing supporting a pulley In an automotive compressor, a pulley (6) is rotatably supported on a compressor housing (1) through a bearing (5) to have an axial gap (10) left between the compressor housing and the pulley. A waterproof cover (13) covers the axi... | 05/09/2006 |
| 7032565 | Rotary combustion engine with lateral thrust between opposing and engaging combustion flywheels A modular revolving cylinder engine including at least two interdependent flywheels driven in rotation by a driving device (1) that rotates them in synchronization and in opposite directions. Each flywheel includes a plurality of equally spaced hollow pushrod... | 04/25/2006 |
| 7014436 | Gear pump A pump comprises a driving rotor and a driven rotor that are positioned in a housing such that, as the driving rotor and the driven rotor rotate, the teeth of the driving rotor and the teeth of the driven rotor mesh to form a positive displacement seal. The teeth of... | 03/21/2006 |
| 6988482 | Dual rotor internal combustion engine An engine including a housing formed with a pair of side-by-side intersecting substantially cylindrical cavities, and a pair of counter-rotating power rotors rotatably mounted within the cavities. The pair of power rotors include intermeshing lobes that each define ... | 01/24/2006 |
| 6776594 | Rotor mechanism The present invention provides an improved rotor mechanism to improve the mechanism of the intermeshing displacement rotor and valve rotor. The main feature is that the displacement rotor and the valve rotor provide the operation curve from the carryover period to i... | 08/17/2004 |
| 6769891 | Rotary positive-displacement pump with meshing gear wheels without encapsulation, and gear wheel for such a positive-displacement pump A rotary positive-displacement pump comprises two gear wheels which mesh with each other without encapsulation. Each gear wheel has a plurality of teeth with a profile which falls within a band of tolerance of ±{fraction (1/20)}th of the depth of the tooth with res... | 08/03/2004 |
| 6709250 | Gear and a fluid machine with a pair of gears A kind of gear is provided with shorter teeth, transition teeth and at least one longer tooth. The cross-section of the longer tooth is of a hawk beak shape, and the profile of the longer tooth is smoothly connected in series by a convex section, a tip section, a co... | 03/23/2004 |
| 6663368 | Spherical gear pump A spherical gear pump that comprises two rotors, or geared spheres, with the teeth arranged around them in a circular band at right angles to their axis of rotation: the pump spheres are covered by close-fitting spherical cases or housings except at the c... | 12/16/2003 |
| 6644947 | Wave tooth gears using identical non-circular conjugating pitch curves This invention is directed to a novel wave tooth gear having a non-circular pitch curve and uniform wave teeth to create a tighter seal between meshing gears. The non-circular wave tooth gear has a major axis and a minor axis disposed perpendicular to the... | 11/11/2003 |
| 6481410 | Rotary piston engine/positive displacement apparatus An engine displacement device including a casing with two internal overlapping rotor chambers, and rotors within the rotor chambers which are arranged to contra rotate to provide internal combustion and/or compression chambers. The casing provides for pri... | 11/19/2002 |
| 6454552 | Fluid mover A pump for moving a fluid has a housing with an internal chamber accommodating a pair of rotors mounted on parallel shafts connected with gears operable to rotate the shafts in opposite directions. Each rotor has opposite end walls and protrusions and poc... | 09/24/2002 |
| 6264449 | Plastic toothed wheel for a toothed wheel pump A plastic toothed wheel for a toothed wheel pump comprises a wheel body (20) having external or internal teeth. To keep the weight of this toothed wheel as low as possible, its teeth (26) have at least one cavity (32) accessible from at least one end face... | 07/24/2001 |
| 6253747 | Torsional coupling for supercharger A supercharger (26) has first (28) and second (29) meshed lobed rotors, each having associated therewith a timing gear (62), the timing gears being meshed to prevent contact of the meshed lobes of the rotors (28,29). Input torque to the supercharger (blow... | 07/03/2001 |
| 6241498 | Rotary fluid mover A pump for moving a fluid has a housing with a internal chamber accommodating a pair of rotating pistons. Each piston has protrusions that register with pockets in the other piston in non-contact relation as the pistons rotate. A fluid accumulator in flui... | 06/05/2001 |
| 6164945 | Vacuum pump rotor and method of manufacturing the same A rotor has an interior free from invasion of water and is resistant to deformation from applied stresses normally encountered during the operation of a vacuum pump. The rotor comprises a rotor shell formed to conform to an outline of lobes and side-plate... | 12/26/2000 |
| 6164944 | Random error generation of tooth index to eliminate pump noise A pump gear for an automatic transmission oil pump having a plurality of teeth. The thickness of each tooth varies randomly from a baseline thickness TB. Correspondingly, the clearance between each tooth varies randomly between each pair of adj... | 12/26/2000 |
| 6146121 | Rotor for use in a rotary pump Fluid being pumped by rotary piston/lobe pumps is prone to fluid cavitation particularly at the leading and trailing edges of the rotor. A rotor 10 comprises a generally cylindrical rotor hub portion 108 formed with two piston wing portions 110, 111. The pisto... | 11/14/2000 |
| 6142759 | Two-shift fluid machine In a Roots displacement fluid machine (5) comprising rotors (15, 17) meshed with each other in a tooth trace (57, 59) formed in parallel to a rotating central axis, and a casing (13) having a rotor chamber (33) rotatably receiving the rotors (15, 17), a f... | 11/07/2000 |
| 6138646 | Rotary fluid mover A pump for moving a fluid has a housing with a internal chamber accommodating a pair of rotating pistons. Each piston has protrusions that register with pockets in the other piston in non-contact relation as the pistons rotate. A fluid accumulator in flui... | 10/31/2000 |
| 6048186 | Driving apparatus comprising modified gear shape elliptic gear wheels A pair of elliptic gear wheels to be installed in a metering chamber casing of positive displacement type flow meters and have a modified gear wheel and the change of gear form of an effective gearing pressure angle of an involute gear form side of long r... | 04/11/2000 |
| 5992230 | Dual rotor flow meter A positive displacement flow meter includes a pair of smooth oval shaped rotors mounted to a pair of spaced apart rotatable shafts contained within a sealed housing. The rotatable shafts penetrate the measuring chamber and have a pair of toothed, oval sha... | 11/30/1999 |
| 5895210 | Turbo machine rotor made of sheet metal A rotor with lobes for use in a turbomachine having a rotation shaft is disclosed. The rotor comprises a rotor shell having a shell member, which is made of a sheet strip metal and having profile curvatures to conform to a required shape of the lobe of th... | 04/20/1999 |
| 5772418 | Screw type compressor rotor, rotor casting core and method of manufacturing the rotor There are provided male and female rotors, which engage with each other at screw-shaped tooth trace portions formed on the rotor bodies; a compressor casing which houses these rotors and has a suction port on one side in the axial direction and a discharg... | 06/30/1998 |
| 5692888 | Gear train mechanism having reduced leakage A gear train mechanism includes a housing having side walls that are made of a material exhibiting a modulus of elasticity of at least 140 GPa. A pair of shafts is supported by slide bearings in the housing and exhibit a length of at least of 1.3 times th... | 12/02/1997 |
