Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8136548 | Air admittance valve An air admittance valve configured when subjected to a negative pressure condition to vent a pipe system to an ambient environment. In general, the air admittance valve includes a main body, inner and outer valve seats, a flexible sealing element, and a lid. The inn... | 03/20/2012 |
| 7971605 | Air admittance vent diaphragm assembly An air admittance vent diaphragm assembly is disclosed. The assembly comprises a base, an annular retainer ring, and an annular malleable washer. The base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular re... | 07/05/2011 |
| 7886765 | Living-hinge air vent valve An application for a living-hinge air vent valve connectable to a sewer conduit includes a base and a cover sealed to the base forming a cavity between the cover and the base. A fluid inlet shaft depends from a roof of the base and is connected to external air passa... | 02/15/2011 |
| 7493913 | Swimming pool vacuum relief safety valve A vacuum relief safety valve includes a housing defining an inner chamber and attached to the suction-side of the swimming pool or spa pump. An air inlet aperture is formed in the housing so as to be open to ambient air. A sealing element is disposed within the hous... | 02/24/2009 |
| 7445022 | Air admittance vent diaphragm assembly An air admittance vent diaphragm assembly is disclosed. The assembly comprises a base, an annular retainer ring, and an annular malleable washer. The base has an annular portion and a stem extending orthogonally from the center of the annular portion. The annular re... | 11/04/2008 |
| 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 |
| 7410608 | Methods for manufacturing a diaphragm for an air admittance valve In some embodiments, a process for manufacturing a diaphragm for an air admittance valve includes disposing a first center disk into a first cavity of a first mold, the first center disk includes a hollow stem. A material is provided into the first mold, through the... | 08/12/2008 |
| 7395835 | Air admittance valve In some embodiments, an air admittance valve includes a base, a screen plate and a diaphragm engageable with the screen plate. The diaphragm may include a first center disk having a stem and a membrane coupled to the first center disk. The membrane may have a contin... | 07/08/2008 |
| 7383855 | Sanitary tank vent valve A combination pressure relief and vacuum relief valve for mounting on a storage tank is disclosed as having two vertical mounting connections of different elevations; a pressure relief valve mounted on one connection; and a vacuum relief valve mounted on the other c... | 06/10/2008 |
| 7310965 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 12/25/2007 |
| 7275560 | Pressure relief door for air duct work A pressure relief door system for use in a duct for relieving positive or negative pressure within the duct includes a frame to be mounted in the duct; a gasket in the frame; a hinged door mounted on the frame and sealing against the gasket; and an adjustable pressu... | 10/02/2007 |
| 7270146 | Air vent valve An air admittance valve assembly for venting ambient air into a system while preventing the escape of gases within the system. A housing includes first and second passageways in fluid communication through a valve seat therebetween. A flat generally thin, flexible, ... | 09/18/2007 |
| 7258019 | Pressure sensor for high acceleration environments A pressure sensor for sensing a fluid pressure in a high acceleration environment. The sensor has a chamber partially defined by a non-planar membrane, the chamber containing a fluid at a reference pressure, such that the non-planar membrane deflects due to pressure... | 08/21/2007 |
| 7234484 | Pressure tank apparatus and method A pressure tank apparatus for use with a plumbing system of the like. The pressure tank apparatus includes a liquid storage vessel having a first end and a second end along with a curved side wall that extends between the first and second ends. The pressure tank app... | 06/26/2007 |
| 7204268 | Internal pressure equilibrium device for airtight space The invention relates to an internal pressure equilibrium adjustment device for airtight space with rapid operation and simple structure. The invention comprises of a pipe 8 which is mounted on the wall 9 of airtight space and has a plurality of... | 04/17/2007 |
| 7159412 | Compressor head, internal discriminator, external discriminator, manifold design for refrigeration recovery apparatus The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 01/09/2007 |
| 7140388 | Dual ball valve air vent valve A unitary valve housing has an upper and lower portion. The upper portion has an inner chamber for accommodating two spaced apart balls and a cylindrical side skirt with oppositely positioned openings. The lower portion is cylindrical in shape and has a top shelf wi... | 11/28/2006 |
| 7080657 | Fuel tank venting system A fuel tank venting system includes a fuel cap, a vent diaphragm and a vent disc. A valve cavity with a substantially concave bottom is formed in a bottom of the fuel cap. At least one air passage is formed through the vent disc. A substantially convex surface is fo... | 07/25/2006 |
| 7073346 | Compressor head, internal discriminator, external discriminator, manifold design for refrigerant recovery apparatus and vacuum sensor The compressor head, internal and/or external discriminator, and manifold design in general utilize ball valves on the suction and discharge of a cylinder head in the recovery of refrigerant liquid and/or vapor. The device facilitates the flashing of liquid refriger... | 07/11/2006 |
| 7051747 | Dual purpose vent attachment assembly A weather cap for gas valve comprising a gas valve vent attachment member for securing to a gas valve vent outlet, a cover connected to the gas valve vent attachment member with the cover and the gas valve attachment member forming a housing having a chamber therein... | 05/30/2006 |
| 7048136 | Canister lid with improved evacuation and vent assembly A canister lid includes a cover member adapted to cover a canister, thereby defining an interior of the canister. An evacuation valve is adapted to allow evacuation of the interior of the container. A vacuum release valve is adapted to allow venting of the interior ... | 05/23/2006 |
| 7032575 | Valve assembly for a fuel pump module A fuel pump module includes a reservoir configured to hold a supply of fuel. The reservoir includes a fuel passageway and defines a first seat on a first side of the fuel passageway and a second seat on a second side of the fuel passageway. The module also includes ... | 04/25/2006 |
| 7025092 | Positive air pressure attenuation device for drainage systems The positive air pressure attenuation device (1) for use in drainage systems in buildings includes a housing (3), connected to the system, to which a flexible reservoir (10) is secured, the flexible reservoir (10) being operable on a posi... | 04/11/2006 |
| 7011103 | Vacuum relief assembly for I.C. engine intakes A Vacuum Relief Assembly for I.C. Engine Intakes is disclosed. Also disclosed is a device that permits outside air into the intake tract of an internal combustion engine in the event of an excessively high vacuum condition within the intake tract. Furthermore, the d... | 03/14/2006 |
| 6994227 | vacuum container to preserve food A vacuum container for preserving food is disclosed herein that includes a cover member for covering an upper part of a container member in which food is filled, a piston member equipped with the cover member and ascending and descending movable, and first and secon... | 02/07/2006 |
| 6959722 | Device for adjusting the degree of vacuum in an apparatus for collecting substances by suction A device for adjusting the degree of vacuum in an apparatus for collecting substances by suction, comprising a valve that is provided with an air flow port connected to the atmosphere at one end and to a chamber at the other end, the chamber being connected to a sou... | 11/01/2005 |
| 6955664 | Suction regulator and fluid drainage system A low cost suction regulator is disclosed in conjunction with a fluid drainage system that includes a suction chamber and a collection chamber. The suction regulator is comprised of an atmospheric chamber and a suction chamber separated by a divider. An opening in t... | 10/18/2005 |
| 6904931 | Vacuum breaker with water leak containment device A vacuum breaker having a floating piston that is movable in response to the communication of negative pressure to an inlet port of the vacuum breaker for permitting venting of fluid to the outside atmosphere through a vent opening. The vacuum breaker includes a liq... | 06/14/2005 |
| 6866056 | Fuel tank venting system A fuel tank venting system includes a fuel cap, a vent diaphragm and a vent disc. A valve cavity with a substantially concave bottom is formed in a bottom of the fuel cap. The vent disc preferably includes a disc flange and a diaphragm projection. At least one air p... | 03/15/2005 |
| 6799600 | Protective metal housing for plastic air admittance valve A protective metal housing is disclosed for an air admittance valve having a head and a hollow stem adapted for coupling to a sewer vent pipe. The housing comprises a cylindrical adaptor having a through passage internally configured for connection at one end to the... | 10/05/2004 |
| 6789565 | Metering valve A metering valve for metering dry powder material such as cement. The interior of the valve housing is expanded outward beginning at the sealing surface or lip located adjacent to the inlet opening, thereby forming an enlarged gap between the valve sleeve and housin... | 09/14/2004 |
| 6687923 | Vacuum release valve and method A vacuum release valve and method are defined. The valve 10, 100, 200 is positioned on a line L between a pool suction inlet I and a pump PU for pumping pool liquid from the inlet and along the line L. The valve 10, 100, 200 includes a valve member 24, 10... | 02/10/2004 |
| 6655402 | System and method for vacuum flushing sewer solids A flushing system and method are provided for substantially reducing sewer solid accumulation in urban drainage systems such that their performance is optimized, their structural integrity is substantially maintained, and pollution of receiving waters is ... | 12/02/2003 |
| 6554018 | Water closet flushing system An improved water closet flushing system utilizing a diaphragm flush valve having a fluid flow control means positioned to receive the fluid discharged from the diaphragm flush valve prior to fluid entering the water closet bowl.... | 04/29/2003 |
| 6532988 | Air admittance valve for sanitary waste pipe system The invention relates to a valve for admitting atmospheric air into the waste pipe system in response to pressure reduction in the system for protecting the water traps in the system and to prevent atmospheric discharge of contaminated air from the waste ... | 03/18/2003 |
| 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 |
| 6394128 | Intake tract negative pressure relief valve for I.C. engine A pressure relief valve is disclosed for use in air intake tracts of I.C. engine installations. The air valve includes a tubular member having apertures therein covered over by resilient diaphragm elements that, when a negative pressure (vacuum) within th... | 05/28/2002 |
| 6374854 | Device for preventing permanent entrapment Device for preventing permanent entrapment that includes a hollow cylindrical body for installation in a suction line. A cylindrical chamber contained in body. A hollow entrappee member with grooves. Chamber contains entrappee member with sealing member, ... | 04/23/2002 |
| 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 |
| 6251285 | Method for preventing an obstruction from being trapped by suction to an inlet of a pool filter pump system, and lint trap cover therefor A method for preventing an obstruction from being trapped by suction to an inlet of a pool filter pump system, and a lint trap cover therefor. The cover is for installation on a lint trap unit located upstream of a pool filter pump, and is configured to v... | 06/26/2001 |
