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| Number | Title | Issue Date |
| 7258060 | Piston and scraper assembly A piston and scraper assembly (26) for a high-pressure liquid chromatography column (1) is provided with a snap lock between the piston (5) and the scraper (25). The snap lock comprises a groove (23) in the piston wall (17),... | 08/21/2007 |
| 7210398 | Cover seals with latching locking features Seal apparatus includes a cover seal having a body and an extending cylindrical sleeve with the sleeve including a radial internal groove. A piston is provided having a circumferential groove and a biasing element is disposed between the internal and circumferential... | 05/01/2007 |
| 7178451 | Piston for metering equipment used in the food and/or chemical and pharmaceutical industries in particular, with improved seal systems A piston designed for use in metering machines employed in the food, chemical and pharmaceutical industries. The piston preferably has a cylindrical body with an annular bead in an intermediate position, a cap made of material designed to form a seal against the cyl... | 02/20/2007 |
| 6205908 | Piston equipped with piston ring The present invention aims at reducing the amount of oil consumption in a piston using a piston ring continuously formed of resin without being provided with an abutment. A stepped portion is formed on a third land, which is located below a second ring ha... | 03/27/2001 |
| 5865091 | Piston assembly for stirling engine A piston assembly for a double-acting engine such as a double-acting Stirling engine. A pair of sealing rings located on opposite sides of a sealing washer are positioned between a base section and a dome section of a piston head. These sealing rings are ... | 02/02/1999 |
| 5042365 | Annular preloaded seal for a sliding piston in cylindrical tank A peripheral sliding seal for sealing the liquid propellant in a cylindrical tank 10 containing a piston 14 for positive expulsion of the liquid propellant. The seal comprises a peripheral inward flange member 16 around the piston periphery adjacent the i... | 08/27/1991 |
| 5011381 | Hand-held vacuum pump vacuum release There is disclosed herein a small and compact vacuum pump which serves as a portable vacuum source. The pump basically includes a cylinder coupled with a handle, and a piston in the cylinder coupled with another handle, along with a suitable valving assem... | 04/30/1991 |
| 4986168 | Piston and multilayer piston ring set Compression piston ring for internal combustion or compressor cylinder and piston comprising double layer of segmented ring sectors having free form circumferential curvature matching the cylinder bore. The double layers are adapted to effectively seal or... | 01/22/1991 |
| 4890542 | High-pressure-fluid machine, a seal The seal, for use especially in non-lubricated, high-pressure, as compressors, in a one-piece, continuous sleeve which envelopes a reciprocable piston for sealing against the piston, or against the cylinder in which the piston translates. One end of the s... | 01/02/1990 |
| 4875405 | Sealing device A sealing device particularly suitable for sealing pistons of working cylinders and for sealing two machine components which can slide against one another is disclosed. A conventional sealing element consisting of low-friction, but not very elastic materi... | 10/24/1989 |
| 4806084 | Hand-held vacuum pump A small and compact vacuum pump which serves as a postable vacuum source is disclosed. The pump includes a cylinder coupled with one handle and a piston therein coupled with another handle, along with a wafer valve assembly for allowing a vacuum to be dra... | 02/21/1989 |
| 4804290 | Latching and sealing device A latching and sealing device suitable for use as a cover seal for a plunger or piston in a syringe or plunger pump includes a cylindrical seal member having a body portion and lip-and-latch means for both sealably engaging a surrounding surface and latch... | 02/14/1989 |
| 4778347 | High production pump for viscous materials and method Apparatus and method of improving the performance of a pump for pumping fireproofing material and the like viscous materials is disclosed wherein the pump is the type which includes a compression chamber (44) having an inlet (48) and an outlet (50). A pis... | 10/18/1988 |
| 4694734 | Sealing construction for slide type vacuum pump with finger portions of spring element pressing cylindrical portion of seal element against cylinder bore A slide type vacuum pump has a cylinder bore with a cylindrical piston reciprocatingly slidably fitted therein and defining a vacuum pumping chamber. A seal element is housed in an annular groove around the piston defined by a radially extending annular s... | 09/22/1987 |
| 4492252 | Reversible valve for reversible refrigeration cycle A reversible valve for reversible refrigeration cycle. The valve means used therein is a hollow cylindrical body longitudinally extending within the valve body. It has a pair of inclined annular walls projecting from around the hollow cylindrical body to ... | 01/08/1985 |
| 4335750 | Reversing valve construction and piston head assembly therefor and methods of making the same A reversing valve construction having a housing provided with a movable valve member therein that is interconnected to a piston unit having opposed piston heads that define a main chamber of the housing therebetween. The housing has end portions respectiv... | 06/22/1982 |
| 4324273 | Reversing valve construction and piston head assembly therefor and methods of making the same A reversing valve construction having a housing provided with a movable valve member therein that is interconnected to a piston unit having opposed piston heads that define a main chamber of the housing therebetween. The housing has opposed ends respectiv... | 04/13/1982 |
| 4270440 | High pressure piston and seal In a pump having a cylinder liner, there is a piston therein, a seal around the piston and rear wearband around the piston body to align the piston within the liner. An elastomeric seal ring is in sealing and sliding contact with the liner. A gap filler, ... | 06/02/1981 |
| 4258614 | Cylinder device A cylinder device has a main body having therein a cylinder having an inner closed end and an outer open end, a piston slidably fitted in the cylinder and having a small diameter portion on the inner end thereof, a liquid pressure chamber defined between ... | 03/31/1981 |
| 4245670 | Reversing valve construction and piston head assembly therefor and methods of making the same A reversing valve construction having a housing provided with a movable valve member therein that is interconnected to a piston unit having opposed piston heads that define a main chamber of the housing therebetween. The housing has opposed ends respectiv... | 01/20/1981 |
| 4048909 | Piston ring A piston ring having a general shape of a cylinder with the first section in the shape of an annulus for engaging a portion of the surface of a piston to provide a fluid-tight seal with the piston and a second section in the shape of a thin-walled bowl wi... | 09/20/1977 |
| 4023467 | Piston compressor for gaseous fluids To permit dry operation of a piston within the cylinder, the cylinder is made of metal, and the piston is made of polytetrafluorethylene; the piston, preferably, is formed with an annular ring groove extending downwardly from an end face thereof to leave ... | 05/17/1977 |
