Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7533692 | Springless compressor valve A fluid-handling system that, in some embodiments, includes a poppet having a body, a magnet, and a mounting member configured to secure the magnet to the body is disclosed. Additionally, a method of forming a valve is disclosed. In some embodiments, the method incl... | 05/19/2009 |
| 7422030 | Air admittance valve assembly A one directional flow valve assembly for a fluid system. The valve assembly is comprised of a valve body having an internal valve chamber in communication with the ambient environment and a valve seat arrangement. The assembly further has a cap structure with means... | 09/09/2008 |
| 7291006 | Check valve lip seal for an injection molding machine A check valve for a molding machine. The check valve has a stem portion and a ring portion movable along said stem portion between a melt channel open position and a melt channel closed position. A groove is formed in a forward face of the ring portion. The groove, ... | 11/06/2007 |
| 7222803 | Liquid dispensing apparatus A hand operated flexible bulb for use with a liquid dipensing apparatus 5, the bulb comprises an open ended neck 2 which is securable in an air tight manner to a liquid dispensing apparatus. The flexible bulb is provided with an air inlet 6 sepa... | 05/29/2007 |
| 7107780 | Vacuum-breaking valve for a refrigerated compartment A vaccum-breaking valve comprising: a tubular body (10) mounted through one of the walls (P) of the cabinet (G) and having inner (11) and outer (12) ends, a valve seat (15) defining a fluid communication between the inside and the outside... | 09/19/2006 |
| 7066722 | Discharge valve for compressor A compressor assembly including a compressor mechanism, a compression chamber and a discharge chamber. A discharge port provides fluid communication between the compression chamber and the discharge chamber. A valve seat circumscribes the discharge port. A discharge... | 06/27/2006 |
| 6802701 | Suction valve assembly of compressor A suction valve assembly of a compressor includes: a piston disposed movable in a cylinder forming a compression chamber, having a suction passage for sucking a fluid and a valve seat formed at a front side thereof; a valve body contacted to the valve seat to open a... | 10/12/2004 |
| 6668849 | Check valve In one embodiment, a check valve includes an outer region and a central region. One or more cuts wind from the outer region towards the central region. In the presence of low along one direction, the check valve opens by extending the central region away ... | 12/30/2003 |
| 6637456 | Safety valve The invention concerns a safety valve, in particular for low pressures and aggressive media, with an inlet which ends at the top in a valve seat upon which lies in a sealing manner a weight-loaded sealing body. A certain overpressure below the valve seat ... | 10/28/2003 |
| 6604544 | Safety valve of tank for storing and carrying oil or chemical substance Disclosed is a safety valve installed in a tank of a vessel carrying oil or chemical substance to discharge supersaturated gas produced in the tank and to adjust an internal pressure to a normal level when a negative pressure is produced in the tank. The ... | 08/12/2003 |
| 6585001 | Flow through ring valve for plastic extruding systems A three piece, sliding ring valve for use in a plasticating screw and barrel arrangement has an extended life. The sliding ring has apertures for passing molten resin therethrough. The sliding ring also has annular contact surfaces for spreading the force... | 07/01/2003 |
| 6457952 | Scroll compressor check valve assembly A compressor assembly including a housing, a compression mechanism disposed in the housing and having a discharge port, and a discharge check valve assembly. Gas substantially at suction pressure is received into the compression mechanism, compressed and ... | 10/01/2002 |
| 6435201 | Non-return valve The invention relates to a non-return valve, which is situated at the end of a plasticizing and injection screw to control the flow of plastic melt from the region of the screw channels of the plasticizing and injection screw to the region of the space in... | 08/20/2002 |
| 6435208 | Flame-retardant pressure equalizing valve A flame-retardant pressure equalizing valve contains a valve body that is guided in a housing. Under the influence of excess pressure, the valve body is displaceable from a closing position into a blow-off position. The housing and the valve body form a f... | 08/20/2002 |
| 6415816 | Air admittance valve assembly A one directional flow valve assembly for a fluid system. The valve assembly is comprised of a valve body having an internal valve chamber in communication with the ambient environment with a valve seat of a predetermined configuration. The assembly furth... | 07/09/2002 |
| 6308731 | Vent valve A vent valve includes a main valve having a valve chamber provided therein with an inside annular valve seat and an outside annular valve seat, a valve body normally seated on the seats under its own weight and opened by atmospheric pressure in response t... | 10/30/2001 |
| 5620021 | Thermal check valve A thermal check valve for use in a gravity flow hot water recirculating system. The hot water system has a hot water heating tank, a water faucet, manifold piping from the hot water heating tank to the faucet, return piping from the faucet to the hot wate... | 04/15/1997 |
| 5584676 | Compressor discharge valve having a guided spherical head A compressor assembly is disclosed including a compressor mechanism mounted within a hermetically sealed housing. A cylinder block contains a reciprocating piston along with a discharge valve assembly. The discharge valve assembly includes a valve plate w... | 12/17/1996 |
| 5477880 | "V" shaped check stop A "V" shaped check stop is provided formed of spring steel or the like having a substantially greater depth than thickness to minimize frontal area in the direction of flow and further to provide for added resistance strength in the direction of flow and ... | 12/26/1995 |
| 5375621 | Check valves A diaphragm- and spring-less check valve for gaseous media comprising an inlet housing (41) having a sealing edge (51), an outlet housing (11) and a closure body (30) disposed in between the housings, which is guided so as to be axially (14) movable and c... | 12/27/1994 |
| 5273068 | Air admittance valve for resisting high internal pressure An air admittance valve device is disclosed for enabling valve sealing member to remain securely closed against high pressure in a pipe or duct produced from: equipment connected to said pipe or duct e.g. a hydraulic pipeline flusher device; fluid movemen... | 12/28/1993 |
| 4820137 | Well pump A submersible well pump of the barrel and piston type characterized by a valve chamber formed coextensively with the barrel and containing an inlet valve and an outlet valves arranged to admit fluid to one end of the barrel on a first stroke of an unporte... | 04/11/1989 |
| 4770160 | Vent damper An improved vent damper for oil or natural gas-fired hot water heaters includes a damper assembly incorporated into the exhaust duct above a hot water heater, and contains a lightweight, floating poppet closure slidably mounted on a reduced-diameter exhau... | 09/13/1988 |
| 4556084 | Air admittance valve An air admittance valve, particularly for use on a stack pipe of a toilet or drainage system, to close the pipe when there is at least atmospheric pressure in the pipe, but to open to admit atmospheric air to the pipe upon the occurrence of even a very sm... | 12/03/1985 |
| 4470767 | Vacuum pump with overload protection valve In a vacuum pump having a housing presenting a suction side and a pressure side, a connecting line connected between the suction side and the pressure side and a weighted valve mounted in the connecting line and having a part which is movable to open the ... | 09/11/1984 |
| 4308887 | Gas damper A gas damper for regulating the mass flow of a stream of purging air as it is directed into an electrostatic precipitator including a generally cylindrical housing having a floating piston positioned in metering relationship to the discharge outlet of the... | 01/05/1982 |
| 4257445 | Shielded vent port A shielded vent port for equilization of the pressure on opposed faces of a wall comprises a frame for fitting into an opening in said wall, a conduit through said frame, a sloping plate in said conduit, said plate being sealed against the walls of said c... | 03/24/1981 |
| 4172465 | Check valve A check valve having a semi-spherical valve member movable longitudinally in a generally tubular housing between a closed position engaging a conical valve seat and an open position spaced longitudinally therefrom, the valve member being slidably mounted ... | 10/30/1979 |
| 4147096 | Breather vent for vapor vent valve A breather vent mountable on the vent pipe outlet from an underground storage tank at a gasoline service station site. A vent housing includes a body section adapted for placement on the vent pipe and which cooperates with a superposed cap section to acco... | 04/03/1979 |
| 4134417 | Quick release valve A quick release valve for vehicle air brake systems includes a movable valve member positioned to close upon the valve exhaust port which valve member includes a body portion and a diaphragm. The areas of the valve member exposed to the valve supply and b... | 01/16/1979 |
| 4128105 | Automatic shut-off valve and method of operation thereof A valve having a closure element in the form of a tapered plug normally maintained by gravity on a vertical rod extending loosely into a bore in the plug. Flow of fluid through the valve in excess of a predetermined rate acts on a flow-responsive surface ... | 12/05/1978 |
| 4103705 | Pressure stabilizer device A pressure stabilizer device designed to be placed on the vent line of underground gasoline storage tanks in a service station. The pressure stabilizer is designed to allow inbreathing in the event a vacuum develops in the underground storage system or ou... | 08/01/1978 |
| 4062479 | Non-return valve assemblies in injection molding machines An injection molding apparatus having a non-return valve assembly mounted on the front end of an extruder screw within a heated barrel for accummulating a charge of thermoplastic material in the forepart of the barrel by the retrograde and rotary movement... | 12/13/1977 |
