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| Number | Title | Issue Date |
| 7159508 | Tank piston seal and stabilizing system An improved seal and stabilizing system for a piston head in a tank cylinder provides a better mechanism for discharging and wiping a cylinder when heavy liquids such as chocolate or peanut butter are being dispensed. The seal system now includes a free-floating blo... | 01/09/2007 |
| 6422131 | High pressure piston seal In a piston pressure device with a sealing device (10) for sealing between spaces of different pressure that includes an elastomer (12) as a first component and a material plastically deformable under pressure as a second component, whereby the components... | 07/23/2002 |
| 5746112 | Piston for tank In an elongate tank for transport or for storage in bulk of semisolid and fluid material such as grease and oil. The tank has an outlet at one end thereof for discharging material contained therein and is of generally cylindric internal cross section. It ... | 05/05/1998 |
| 4759266 | Multiple part oil-control ring for piston An oil control ring for a piston in an i.c. engine comprising an expander ring and two lamellar rails which scrape the oil from the cylinder wall. The expander ring has two series of lugs arranged alternately on each side, which support the rails and two ... | 07/26/1988 |
| 4696624 | Casing pump A well-pressure operated pump having a tubular pump body provided with an interior, annular seating surface to receive a valve member mounted on a rod extending through the seating surface. An air spring in the pump body urges the rod upwardly in response... | 09/29/1987 |
| 4508354 | Moving piston with self-tightening sealing ring Packing or sealing moving in a hollow cylinder. Such a device, or moving piston with self-tightening ring, comprises two elements of cylindrical external outline such as a cylindrical rod integral with the first element slides in a cylindrical chamber delimite... | 04/02/1985 |
| 4226169 | Adjustable expandable cryogenic piston and ring The operation of a reciprocating expansion engine for cryogenic refrigeration is improved by changing the pistons and rings so that the piston can be operated from outside the engine to vary the groove in which the piston ring is located. This causes the ... | 10/07/1980 |
| 4211345 | Apparatus for the feeding (metering) of liquid synthetic-resin components A dosing unit for highly filled synthetic-resin components, usually a polyol and an isocyanate mixed with glass fiber, barite or chalk, comprises a piston which displaces the components or one of them, especially the filled component under the control of ... | 07/08/1980 |
| 4020750 | Piston pump mechanism A piston pump mechanism includes a plunger head slideably mounted within a cylindrical sleeve member. The plunger head has an upper portion forming a shoulder and a reduced lower portion around which an inner ring of resilient material is mounted. An oute... | 05/03/1977 |
