Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7685928 | Steering mechanism A powered steering mechanism can operate in a steering mode or in a powered self-centering mode. The mechanism of the present invention includes a cylinder into and out of which can reciprocate a rod. The rod is provided with a fixed piston that defines a first pres... | 03/30/2010 |
| 7409901 | Variable stroke assembly A variable stroke assembly enables the piston stroke length of a positive displacement pump to be varied while maintaining a substantially constant unswept volume in the piston cylinder. Alternatively, a variable stroke assembly enables the piston stroke length of a... | 08/12/2008 |
| 7380492 | Hydrostatic variable displacement unit having a swash plate and a servo system having a spring arrangement A hydrostatic variable displacement unit is provided having a swash plate which serves to adjust the stroke of displacement pistons in a cylinder block and can be pivoted in its angular position by means of a servo system, the servo system having at least one servo ... | 06/03/2008 |
| 7337805 | Valve with adjustable stop An adjustable mechanism for a valve or actuator is provided. The adjustable mechanism cooperates with one or more pistons, which in turn cooperates with a valve element to limit the axial displacement of the valve element relative to the valve seat. The adjustable m... | 03/04/2008 |
| 7249936 | Dual capacity compressor A dual capacity compressor, which can maintain a fixed eccentricity and stable operation, even when the compressor is rotated in both the regular and reverse directions in order to provide multiple compression capacities, is provided. This dual capacity compressor i... | 07/31/2007 |
| 7219594 | Coolant system for piston and liner of reciprocating pumps A reciprocating pump assembly includes piston rod that is movable and reciprocates in order to pump a fluid. The piston rod has a piston portion at an end that stokes within a piston chamber. The pump assembly also includes a piston rod sleeve that houses the piston... | 05/22/2007 |
| 7207503 | Chemical dispensing means for a travelling lawn sprinkler A chemical dispenser which is selectively removably mounted on a travelling lawn sprinkler. The chemical dispenser dispenses liquid chemical into the water being sprinkled onto the lawn by the water distributor as the self-propelled travelling lawn sprinkler propels... | 04/24/2007 |
| 7179063 | Reciprocating-piston machine with a sliding sleeve In a reciprocating-piston machine, in particular a refrigerant compressor for a motor vehicle air-conditioning system, including a machine shaft rotatably supported in a housing, a plurality of pistons arranged circularly around the machine shaft in the housing, and... | 02/20/2007 |
| 7146903 | Dual capacity compressor Dual capacity compressor including a power generating part (20) having a reversible motor (21, 22) and a crank shaft (23) inserted in the motor (21, 23), a compression part (30) having a cylinder (32), a piston (31), ... | 12/12/2006 |
| 7022837 | Cellulose ethers and method of preparing the same The present inventors have discovered that the solution rheology of cellulose ethers prepared from cellulose pulp is altered by mercerizing and recovering cellulose pulp before preparing the cellulose ethers. For example, the solution viscosity of carboxymethyl cell... | 04/04/2006 |
| 6979125 | Rod-guided crosshead assembly A rod-guided crosshead assembly for use in a pump or similar machine. The assembly includes a crosshead having a rigid body with a pair of parallel passageways passing from the front to the rear of the body. The body also has a rearwardly opening cavity between the ... | 12/27/2005 |
| 6978712 | Variable displacement piston type pump A method of providing variable pumping rate from a piston type pump at a constant drive speed, comprising providing a connecting rod connected to the throw of a crankshaft on one end and to a connecting pin on the other end, constraining said connecting pin to move ... | 12/27/2005 |
| 6918335 | Dual capacity compressor Dual capacity compressor including a power generating part including a reversible motor and a crank shaft inserted in the motor, a compression part including a cylinder, a piston in the cylinder, and a connecting rod connected to the piston, a crank pin in an upper ... | 07/19/2005 |
| 6786705 | Variable displacement compressor A variable displacement compressor has a drive shaft, a rotor supported by the drive shaft, a drive plate supported by the drive shaft and a hinge mechanism located between the rotor and the drive plate. The hinge mechanism includes a cam, which is located on the ro... | 09/07/2004 |
| 6755624 | Dual capacity compressor A dual capacity compressor, which can maintain a fixed eccentricity and stable operation, even when the compressor is rotated in both the regular and reverse directions in order to provide multiple compression capacities, is provided. This dual capacity compressor i... | 06/29/2004 |
| 6694764 | Air conditioning system with electric compressor An air conditioning system using a refrigerant to control a temperature of a climate-controlled area. The air conditioning system comprises a refrigerant circuit and a compressor coupled to the refrigerant circuit. The compressor includes a compression me... | 02/24/2004 |
| 6679684 | Pump device having a device for restricting movement of a movable member movable to pressurize working fluid A pump device comprising a support member having a fitting recess, a movable member which is reciprocated in said fitting recess to suck a working fluid, pressurize the fluid and deliver the pressurized fluid, and a movement restricting device operable to... | 01/20/2004 |
| 6406269 | Fuel pump A fuel pump comprises a pumping plunger reciprocable within a plunger bore under the action of a cam drive arrangement. The cam drive arrangement comprises first and second surfaces defining therebetween a chamber, the volume of which can be controlled to... | 06/18/2002 |
| 6085884 | Actuating element for a clutch actuated by pressure medium An actuating element for a clutch includes a stop which is adjustable by an automatic adjusting device for ensuring that the actuating stroke of a piston increases in the releasing direction of the clutch and that the actuating stroke is displaced away fr... | 07/11/2000 |
| 6041804 | Subsea valve actuator and method A subsea actuator and method is disclosed that includes a removable monolithic cap/hydraulic chamber that seals the actuator housing top with seals placed around the monolithic cap, defines a straight hydraulic line and port for control line hydraulic flu... | 03/28/2000 |
| 6014924 | Slide drive arrangement A slide drive device has a principal housing, in which at least one actuating element able to be driven linearly is arranged. Externally on the principal housing there is a slide kinetically coupled with the actuating element. Two stroke limiting means re... | 01/18/2000 |
| 5957030 | Actuator and the process for its assembly An actuating cylinder (2), especially for a hydraulic clutch operation device in a motor vehicle, is disclosed, having a piston unit (6) arranged in a housing (4) and guided via a guide sleeve (8) which is permanently connected to the housing, wherein the... | 09/28/1999 |
| 5951261 | Reversible drive compressor A reciprocating piston compressor including at least one cylinder, a reciprocable piston disposed therein, a crankshaft rotatable in forward and reverse directions and having an eccentric crankpin, and a cam disposed about the crankpin, the piston operati... | 09/14/1999 |
| 5676527 | Air pump having an adjustable stroke An adjustable flow pump, particularly an air pump, utilizing reciprocal movement of a diaphragm movement bar to achieve pumping. The stroke of the reciprocating diaphragm movement bar can be adjusted without stopping operation of the pump. The diaphragm m... | 10/14/1997 |
| 5501137 | Hydraulic machine-tool actuator with position detectors An actuator has a cylinder centered on an axis and a piston axially displaceable in the cylinder, defining therein axially opposite front and rear compartments, and having an axially rearwardly projecting stem. A distributor is axially fixed but rotatable... | 03/26/1996 |
| 5496153 | Method and apparatus for measuring piston position in a free piston compressor A method of measuring the distance at closest approach between the piston of a free piston compressor and the cylinder head. The method derives measurements of both the alternating and average components of piston position from direct measurements of the ... | 03/05/1996 |
| 5419235 | Power steering gear assembly A steering gear assembly (12) for a vehicle having steerable wheels includes a housing (14) defining a chamber (16) and a piston (18) movable through a work stroke in the chamber. The piston (18) is connected for movement with the steerable wheels of the ... | 05/30/1995 |
| 5357844 | Run-up control for the pressure cheek in a drawing apparatus A run-up control for the pressure cheek in a drawing apparatus achieves stoppage times during the run-up phase by having a pressure cylinder with first and second pressure spaces as well as a control piston which is fixed in its position in the control cy... | 10/25/1994 |
| 5355774 | Aircraft brake piston cap assembly The improved aircraft brake piston cap assembly (40, 40') comprises an aircraft piston (10) having a pair of openings (46) extending through the piston (10) and a piston cap (42) with a flange (44) fitted around the circumference of the piston (10 ) and h... | 10/18/1994 |
| 5342176 | Method and apparatus for measuring piston position in a free piston compressor A method of measuring the distance at closest approach between the piston of a free piston compressor and the cylinder head. The method derives measurements of both the alternating and average components of piston position from direct measurements of the ... | 08/30/1994 |
| 5301597 | Hydraulic cylinder A hydraulic cylinder, preferably for use as a master or slave brake cylinder or in a hydraulic clutch system, maintains in a simple and inexpensive manner through the use of eccentric bushings the stroke length of the piston rod. The distance between the ... | 04/12/1994 |
| 5263830 | Peristaltic pump assembly A peristaltic pump assembly for pumping a fluid medium from a fluid source through a tubing having a compressible pumping section, which assembly comprises a housing including at least one support wall; a drive shaft journalled substantially loosely to th... | 11/23/1993 |
| 5253671 | High pressure diaphragm valve A diaphragm valve for high pressure use has a metal diaphragm which is actuated into and out of direct engagement with a valve seat by an air operator acting through a force multiplying lever assembly. The valve seat is confined by rigid interior and exte... | 10/19/1993 |
| 5246354 | Valveless metering pump with reciprocating, rotating piston A valveless metering pump includes a simultaneously reciprocating and rotating piston. The pump head includes radially spaced coplanar ports for drawing and dispensing fluids as the piston rotates sequentially past the ports. The reciprocating stroke of t... | 09/21/1993 |
| 5207062 | Center valve master cylinder with adjustable caged primary spring A center-compensation master cylinder (10) has first (20) and second (30) pistons with center-compensation valve members (27, 37). The pistons (20, 30) have diametrically extending slots (22, 32) at central axial portions thereof through which extend pin ... | 05/04/1993 |
| 5189942 | 3-position actuator A 3-position actuator having a moving body comprising a piston and piston rod slidingly reciprocating in an axial direction within a casing, a part of the rod protruding from said casing, said moving body being moved to one end side when fluid flows into ... | 03/02/1993 |
| 5127315 | Brake motor subassembly and process for adjusting such a subassembly A brake motor subassembly comprises a control piston (10) having an internal cavity delimited by a base wall (18) and, at the periphery, by a stepped bore (20, 22, 24) and having a mechanical actuating device acting on the control piston via an automatic ... | 07/07/1992 |
| 5052277 | Hydraulic cylinder for braking elements of vehicles In an hydraulic cylinder for vehicle braking elements, a clamping piston (1) moved in a housing (3) by hydraulic pressure acts relative to a brake lining carrier bearing a brake lining, e.g., in the form of a brake shoe which, during braking, is forced ag... | 10/01/1991 |
| 5040768 | Powdery article supply valve mechanism A powdery material supply valve mechanism including a valve means disposed in front of a piston rod means in a longitudinally aligned relationship with each other, a valve housing means incorporating operatively the valve means and the piston rod means th... | 08/20/1991 |
| 5035270 | Automatic conveyorized container filler An automatic conveyorized volumetric container filler is provided and consists of a mechanism to pump a predetermined amount of fluid from a reservoir into containers by using volumetric piston pumps operated by a pump drive cylinder. The containers are a... | 07/30/1991 |
