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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 7421782 | Method for manufacturing internal combustion engine piston A method is provided for efficiently manufacturing a high quality internal combustion engine piston having an annular cavity allowing for good circulation of cooling fluid. An annular groove is formed at the circumferential edge of the top face of a piston crown, or... | 09/09/2008 |
| 7398754 | Piston for internal combustion engine A piston for internal combustion engine has both fatigue strength and wear resistance without increased production cost. At least one of a combustion chamber surface, a skirt rib, a pin boss rib which connects a pin boss and a crown, a lower portion of the pin boss ... | 07/15/2008 |
| 7219416 | Method of manufacturing a magnetic element The present invention provides a composite magnetic body containing metallic magnetic powder and thermosetting resin and having a packing ratio of the metallic magnetic powder of 65 vol % to 90 vol % and an electrical resistivity of at least 104 Ω·cm. W... | 05/22/2007 |
| 7213562 | Piston for a combustion engine and casting method for the production thereof The invention relates to a piston (1), which is comprised of an approximately circular cylindrical upper area (5) and of a lower area (6), having two hubs (7), which are set back toward the piston central axis (8) so that, in the u... | 05/08/2007 |
| 7178237 | Piston for a piston-cylinder arrangement, in particular a shock absorber piston The invention relates to a piston for a piston-cylinder arrangement, especially a shock absorber piston, comprising a piston body that is fitted with at least one peripheral web on its peripheral surface, wherein a collar-shaped sealing element made of thermoformabl... | 02/20/2007 |
| 7093341 | Method of making an axial piston pump barrel with a cast high pressure collection cavity In an axial piston pump, a plurality of reciprocating pistons are at least partially positioned within a barrel. The barrel includes a ring shaped high pressure collection cavity that is positioned between the piston chambers and the outlet of the pump. In order to ... | 08/22/2006 |
| 6973723 | Piston formed by powder metallurgical methods A piston includes a piston structure being unitarily formed in a powder metallurgy process, the piston structure having a crown assembly and a skirt assembly, at least a partial combustion chamber being formed intersecting a piston crown surface during the powder me... | 12/13/2005 |
| 6681485 | Method for casting a piston for a reciprocating internal combustion engine A process for producing pistons for a reciprocating internal combustion engine by casting, the process including the steps of determining for at least a first piston of a casting process batch, a volume Vactual formed by a surface of the piston... | 01/27/2004 |
| 6438834 | Method of making a swash plate type compressor piston whose head portion is formed by pore-free die-casting A method of producing a piston for a swash plate type compressor including a head portion which is slidably fitted in a cylinder bore of the compressor, and an engaging section which engages a swash plate of the compressor, wherein a blank including a hol... | 08/27/2002 |
| 6063509 | Reinforcing component of which the basic material is austenitic cast iron In a reinforcing component made from austenitic iron which is bonded intermetallically with an engine component made from an aluminium-base alloy, in particular a piston, the aim is to improve the strength of the bond irrespective of the graphite configur... | 05/16/2000 |
| 6029346 | Method of fabricating carbon--carbon engine component An internal combustion engine component assembly including piston, wrist pin, and cylinder sleeve, all constructed of a matching carbon--carbon composite is disclosed. The piston is a two-piece assembly divided in crown and skirt, each fabricated individu... | 02/29/2000 |
| 5979298 | Cooling gallery for pistons A cast piston having a metal insert that includes a cooling gallery and defines a piston ring groove. The piston insert includes an annular base having an annular cavity formed therein and an annular ring which extends radially outward from the base. A ca... | 11/09/1999 |
| 5901772 | Method for casting pistons A ring carrier, for use in a piston casting die, is an annular-shaped member having a channel on an outer surface area. The piston casting die includes projections for engaging the channel and supporting the ring carrier within the piston casting die. At ... | 05/11/1999 |
| 5794517 | Piston assembly A piston assembly that is movable back and forth parallel to its axis in a cylindrical housing, comprising a piston-like support part made of a hard material and a guide ring made of a polymer. The guide ring surrounds the support part along a portion of ... | 08/18/1998 |
| 5737838 | Method of making a piston unit for an internal combustion engine The method of making a piston unit for an internal combustion engine incorporates the steps of pinching a melting core in a mold cavity of a piston mold wherein the melting core includes an inner ring that forms a ring shaped passage within a piston body,... | 04/14/1998 |
| 5551388 | Piston with cavity A piston (10) containing a cavity (16) is manufactured by forming a box (20; 50; 70; 80). The interior of the box defines the cavity (16). The box ms mounted in a die cavity (26) and the piston is cast around the box. The box is provided with projections ... | 09/03/1996 |
| 5490446 | Apparatus and method for a piston assembly An apparatus and method is provided for producing a piston assembly for use in a fluid translating device such as a hydraulic pump or motor. In the subject arrangement, a piston is provided having a cavity at one end thereof and a slipper having a spheric... | 02/13/1996 |
| 5408916 | Piston having a liner and method for manufacturing same A piston assembly (10) for use in an engine. The piston assembly (10) includes a piston body (12) with a liner (24) covering the interior surface (22) thereof. The liner (24) imbues added strength and dimensional stability during casting, machining, engin... | 04/25/1995 |
| 5345860 | Banded piston and method of making A piston for use in a hydraulic cylinder which is subject to sudden and extremely high shock load pressures and high temperature operating conditions is provided with a plurality of interlocking axially-spaced circumferential grooves. A band of a heat-for... | 09/13/1994 |
| 5282412 | Piston ring subassembly, angulating piston assembly and method of making same An angulating piston assembly for a vehicle air conditioning system compressor comprises a composite piston including a metal rod having a ball at a proximal end and a plastic head at a distal end. A piston ring subassembly is operatively received about t... | 02/01/1994 |
| 5273009 | Silicon-nitride-inserted piston A metal of which the body of a piston is formed contains iron as its main component, and the configuration of a silicon nitride member, the high-temperature strength of the silicon nitride material that composes the silicon nitride member, the melting poi... | 12/28/1993 |
| 5253625 | Internal combustion engine having a hypereutectic aluminum-silicon block and aluminum-copper pistons An internal combustion engine having an engine block containing a plurality of cylinder bores and a piston slidably mounted in each bore. The block is composed of a hypereutectic aluminum-silicon alloy containing from 16% to 30% silicon and having precipi... | 10/19/1993 |
| 5216943 | Piston for hydrostatic axial and radial piston machines and method for the manufacture thereof A method of manufacturing a piston for hydrostatic axial and radial piston machines by non-machining forming, by filling a material that is in a substantially unresistant, formable state into a mold defining a piston outer contour which is closed on all s... | 06/08/1993 |
| 5170556 | Production method for forged component made of composite material A production method of a forged component made of a composite material in accordance with the present invention comprises packing pellet or powdery plastic particles, plastic particles coated on the surface with a metallic material or molten plastic mater... | 12/15/1992 |
| 5119777 | Light alloy piston In a pressure-diecast light alloy piston, a ring carrier made of a metallic material having pores filled by the piston materials is embedded in the piston casting adjacent to the first ring groove. In order to provide a strong joint to the piston base bod... | 06/09/1992 |
| 5056218 | Method of making a hollow metal piston having elastic strip casted to its skirt A light metal piston for internal combustion engines has a pair of inserts on the inside of upper piston skirt made of a material of lower thermal expansion coefficient than that of the light metal, such as steel. Each insert has a pair of bands which are... | 10/15/1991 |
| 5044257 | Rotary actuator and method for forming a rotary piston Improved techniques are provided for manufacturing a toroidal arc segment piston for use in a fluid pressure responsive rotary actuator, and for forming an actuator housing defining an arcuate chamber for receiving a rotary actuator piston. A moldable pol... | 09/03/1991 |
| 5022313 | Composite piston assembly for automotive air conditioning compressor A composite piston for an automotive air conditioning compressor is provided having an aluminum shank or piston rod, a reinforced plastic piston head and a steel ball for engaging a socket plate or the like. The shank has a distal end that has a slight re... | 06/11/1991 |
| 4997024 | Method of making a piston A method of bonding a component in a piston, involves the steps of coating the component surfaces to be bonded with an oxidation-resistant particulate material, preheating the coated component, placing the preheated component in a casting die and then cas... | 03/05/1991 |
| 4829954 | Method of forming self-sealing piston A spherically-shaped piston is rigidly attached to a connecting rod for reciprocating and tilting motion within a borehole in response to rotation of a crankshaft having an associated crank which is rotatably attached to the connecting rod. Web and ribs a... | 05/16/1989 |
| 4799540 | Heat exchanger The invention relates to a heat exchanger, especially for motor vehicles, which consists of a plurality of fins disposed in a parallel, spaced relationship, having openings and collars of oval or planar cross section adjoining the openings, and of a plura... | 01/24/1989 |
| 4776075 | Method for manufacturing piston of internal combustion engine A method for manufacturing a piston of an internal combustion engine, especially for forming a piston gallery portion provided in the piston head for cooling the engine. A gallery member made of a metal pipe having a high thermal conductivity or a salt-co... | 10/11/1988 |
| 4735128 | Piston A piston for internal combustion engines made of a light alloy and comprising a skirt portion and a head portion, having a ceramic insert adapted on the head portion and connected to same by mechanical locking. The ceramic insert is provided with pores at... | 04/05/1988 |
| 4712600 | Production of pistons having a cavity A piston of a light alloy matrix material having a cavity for containing heat insulating air immediately below its head or a cavity for passing cooling oil inside the grooved side wall is manufactured by preforming a precursory member having the shape of ... | 12/15/1987 |
| 4599772 | Method for reinforcement of pistons of aluminum or aluminum alloy The reinforcement of the crown of a piston of aluminum or aluminum alloy for an internal combustion engine comprises the preparation of a reinforcement member (10, 13) which is provided with apertures (11, 14), or reentrants. The reinforcement member is p... | 07/15/1986 |
| 4559685 | Method of manufacturing a piston for internal combustion engines A method of manufacturing a piston for internal combustion engines which utilize a core molding or casting system for forming a hollow chamber for the passage of cooling oil therethrough. The manufacturing method includes the steps of preparing a core so ... | 12/24/1985 |
| 4548254 | Method of manufacturing a die-cast wobble plate assembly An improved method of manufacturing a swash plate assembly for use in a compressor, fluid motor or similar device in which a plurality of pistons are connected, by means of connecting rods, to a swash plate which drives (or is driven by) the pistons. A pl... | 10/22/1985 |
| 4450610 | Method of making a piston A piston composed at least in part of fiber-reinforced synthetic resin material, is provided with a piston base or bottom, a piston shaft or shank, and eyes for engagement with a member to be driven by or for driving the piston. According to the method of... | 05/29/1984 |
| 4404262 | Composite metallic and refractory article and method of manufacturing the article A composite metallic and refractory article and a method for manufacturing the article is described in which a metallic layer is partially adsorbed within a refractory layer, such as a ceramic layer. The density of the refractory layer increases as it ext... | 09/13/1983 |
| 4365399 | Manufacture of light weight pistons A method of manufacture of novel light-weight pistons of aluminum forgings with an integral iron insert ring by fusion welding is described. The aluminum piston forging is provided with a configuration adapted to receive the iron insert ring which may be ... | 12/28/1982 |
