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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7431305 | Oil scraper ring ring groove arrangement for pistons of internal combustion engines The invention relates to an oil scraper ring groove ring arrangement for pistons of internal combustion engines. The inventive arrangement comprises a disk that is provided with parallel flanks and a bearing surface having an asymmetrical crowned form with a vertex ... | 10/07/2008 |
| 7370866 | Sleeve element having a biasable end region, apparatus including same, and method of use A sleeve element having at least one end region configured to be biased into a laterally adjacent recess formed in one of a piston element surface and a bore surface is disclosed. A seal assembly is disclosed including two sleeve elements, each sleeve element having... | 05/13/2008 |
| 7234704 | Wiping and/or sealing element as well as process for sealing a piston and clamping and/or support element The present invention pertains to a wiping and/or sealing element for sealing a piston (11) guided movably in a housing (10) with a seal held in a groove (21, 30). The present invention pertains, furthermore, to a process for sealing a movable p... | 06/26/2007 |
| 7188841 | Secondary piston seal A secondary seal is provided for an internal combustion engine having a piston, cylinder bore, ring seal, secondary seal, and leak path. Forces are applied from the combustion side of the piston through a cylinder gap and a leak path to the secondary seal. The secon... | 03/13/2007 |
| 7096844 | Four-stroke engine lubricated by fuel mixture A four-stroke engine includes a piston cylinder, and a piston located in the cylinder and movable within the cylinder. The engine includes a crankcase attached to the cylinder, the piston providing a separation boundary of a combustion portion of the cylinder from t... | 08/29/2006 |
| 6805360 | Regulator with segmented body The regulator connects to a high pressure fluid supply and regulates the pressure to a downstream apparatus. If an over-pressure occurs, it is vented to atmosphere. A segmented body reduces production cost. An elongate control stem engages a supply seal assembly and... | 10/19/2004 |
| 6682078 | Ring groove for oil ring with coil expander of piston A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring gro... | 01/27/2004 |
| 6547251 | Ring groove for oil ring with coil expander of piston A ring groove for a two-piece oil ring of a piston is provided that has ring body equipped with a coil expander, wherein the ring body has an upper outer surface and a lower outer surface, both orthogonal to the axial direction of the piston. The ring gro... | 04/15/2003 |
| 6416058 | Packing seal with dynamic self-adapting lip The invention concerns a packing seal with its lip (1) placed in a toroidal housing (2) of a part (3) mobile in rotation and/or translation relatively to a part (4) and whereof the lip (5) ensuring the seal between the lining and the part (4) exerts on sa... | 07/09/2002 |
| 5474307 | Piston ring employing elastomeric sealing member within the ring groove A piston head assembly has one, two or more grooves to receive piston rings. One or more of the grooves may receive multiple piston rings. A circumferential groove from the bottom of the elastomeric material allows oil pressure to aid in sealing. A novel ... | 12/12/1995 |
| 5392692 | Antiblow-by piston and seal construction for high temperature applications A piston and ring assembly operative within a cylindrical bore wall to retain fluid to one side of the assembly, comprising a piston having at least one annular stepped groove in the side wall of the piston, the groove being stepped into uppermost and low... | 02/28/1995 |
| 5347915 | Piston compressor for the oilfree compression of gases The piston (6) guided in a cylinder (1) has at least one split so-called trapped piston ring (10) disposed in an annular groove on the piston. The circumferential face (12) of the ring remote from the inner face (11) of the cylinder bounds in the annular ... | 09/20/1994 |
| 5253877 | Piston ring having tapered outwardly extending wiper A piston head assembly has one, two or more grooves to receive piston rings. One or more of the grooves may receive multiple piston rings. One of the piston rings may have a wiper extension on the lower outside edge of the ring either of metal or elastome... | 10/19/1993 |
| 5233912 | Piston for forcing liquid metal out of a casting cylinder A piston for forcing a liquid metal out of a casting cylinder of a die-casting press, having a mounting piece with an end surface and an outer peripheral surface; and a cap having an inner cover surface, an inner peripheral surface, and a free edge surfac... | 08/10/1993 |
| 5050892 | Sealing arrangement for piston in compressor A piston for a compressor comprising a ring groove on the outer circumferential surface of the piston, and a discontinuous ring seal member with opposite split ends made of a plastic material and fitted in the ring groove. The ring member having an outer ... | 09/24/1991 |
| 5016524 | Sealing arrangement for a piston in a compressor A continuous seal ring member fitted in a ring groove of a piston of a compressor. The seal ring member has a washer-like initial shape with an internal diameter smaller than an outer diameter of the piston, whereby the inner peripheral portion of the sea... | 05/21/1991 |
| 4978102 | Aligning and seal ring retracting apparatus for plug type valve A valve plug assembly for use in a steam throttle valve includes a valve body and a removable guide ring attached to one end of the valve body. An outer edge portion is removed from the guide ring at the interface with the valve body so that a circumferen... | 12/18/1990 |
| 4749202 | Sealing and guide unit for pistons in general A sealing and guide unit for pistons comprising an energized elastic ring placed into a corresponding cavity or groove and a rigid antifriction ring fitted on said elastic ring and projecting at both its sides to cover the extended borders of said cavity ... | 06/07/1988 |
| 4736586 | Seal mechanism for a Stirling engine A seal mechanism for a Stirling engine has an upper and lower piston ring mounted on a displacer piston with a space therebetween and at least one piston ring mounted on a power piston. The seals produced by the piston rings of the displacer piston are gi... | 04/12/1988 |
| 4676143 | Piston seal device for reciprocating compressor A piston seal device for a reciprocating compressor, having a piston slidably mounted in a cylinder bore and having a circumferential groove, and a resilient piston ring fitted in the circumferential groove of the piston and sealingly engageable with the ... | 06/30/1987 |
| 4582328 | Double acting stirling engine piston ring A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby ... | 04/15/1986 |
| 4466624 | Sealing arrangement The disclosed arrangement is for sealing between two cylindrical bodies with an annular gasket ring in such a way that the seal is established only under conditions of a predetermined fluid pressure, so that at a lower pressure a flow is permitted across ... | 08/21/1984 |
| 4422649 | Stirling engine piston ring A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby ... | 12/27/1983 |
| 4371178 | Sealing arrangement, particularly for sealing valve piston relative to valve housing A sealing arrangement, particularly for sealing a valve piston relative to a valve housing, has a plurality of sealing rings arranged to be located between a valve piston and a valve housing, and axially spaced from each other, and a plurality of supporti... | 02/01/1983 |
| 4355815 | Piston ring A cross-sectionally U-shaped radially inwardly open piston ring for a piston slidably received in a cylinder and dividing the cylinder into a high-pressure side and a low-pressure side. The piston ring includes first and second radially inwardly projectin... | 10/26/1982 |
| 4346685 | Internal combustion engine with gas sealing device An internal combustion engine having a gas sealing device including an L-shaped keystone piston ring groove formed on the outer circumferential surface of a piston, and an L-shaped keystone piston ring in pressing contact with the inner surface of a cylin... | 08/31/1982 |
| 4202526 | Valve The valve having a casing with an inflow and outflow connection which can be separated from or connected to one another by means of a movable valve member which can be brought to bear against a valve seat, the movable valve member being provided with a da... | 05/13/1980 |
| 4195849 | Piston fluid seal mounting PCT No. PCT/US 79/00091 Sec. 371 Date Feb. 15, 1979 Sec. 102(e) Date Feb. 15, 1979, PCT Filed Feb. 15, 1979, Ser. No. 30,243. A cylinder (10) and piston (14) device has a piston (14) with a circumferential fluid seal mounting band (17) near one of its ends, a ... | 04/01/1980 |
| 4178899 | Low-friction piston A piston comprising hydrodynamic skirts and crowns, pressure-actuated sealing rings of fixed excursion or balanced by hydrodynamic reactions, or no rings at all, stringent temperature control, ample oil on the cylinder wall even near top-dead-center, char... | 12/18/1979 |
| 4121838 | Shaft seal structure A shaft coaxially mounted within a cylinder is sealed with respect to that cylinder by means of an annular carrier affixed to the shaft and having its periphery facing the inner wall of the cylinder provided with an annular seal groove having an inverted ... | 10/24/1978 |
| 4102608 | Reciprocatory piston and cylinder machines Vacuum pump of reciprocating piston and cylinder type. Cylinder is stepped to have front large diameter portion and rear small diameter portion. Piston has enlarged head portion sliding in front portion of cylinder and rear portion sliding in rear portion... | 07/25/1978 |
| 4067584 | Guiding and sealing arrangements for pistons, piston rods and the like A guide ring having a seating surface of `U`-shaped cross-section. A plurality of the guide rings may be carried by a piston, piston rod or the like in abutting relation to provide a continuous imperforate surface, or axially spaced from one another with ... | 01/10/1978 |
| 3990711 | Restrained elastomeric seal ring means An elastomeric sealing system for sealing between two metal plates in contact along a contact plane and simultaneously sealing between a bored opening through the plates perpendicular to the contact plane, and a cylindrical piston in the bored opening. Th... | 11/09/1976 |
| 3930657 | Device for sealing between preferably movable parts A device for producing a seal between movable and/or stationary parts, such as a piston and a cylinder particularly under conditions of high fluid pressures, comprises a sealing ring having an O-ring configuration and fabricated of a material such as rubb... | 01/06/1976 |
