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."
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 8136441 | Hydraulic machine, in particular hydraulic motor, with a reciprocating movement, and differential piston for such a machine Hydraulic machine, in particular hydraulic motor, comprising a casing, a differential piston (4) having a region of large cross section and a region of smaller cross section, which can slide with a reciprocating movement respectively in the casing and in a ho... | 03/20/2012 |
| 7240606 | Crimped piston to rod joint A method for assembling a piston on a rod, and resultant piston and rod assembly, uses one or more lock rings that are mechanically deformed radially inwardly into respective locking grooves in the rod, thereby axially locking the lock ring to the rod. The lock ring... | 07/10/2007 |
| 7175176 | Device for feeding suction air or blowing air in a sheet-processing machine A device for feeding suction air or blowing air to a sheet-retaining device displaceable relative to a machine element in a sheet-processing machine, includes a first air-feeding element connectible in terms of flow to a suction-air or blowing-air source. A second a... | 02/13/2007 |
| 7061153 | High speed motor coils An electric motor may include a plurality of stationary field coils. The field coils are disposed so that they are overlap and are nested with adjacent field coils. A portion of each coil is disposed above a portion of an adjacent coil, and a portion of each coil is... | 06/13/2006 |
| 6327963 | Piston or plunger and a method for making the same A piston or plunger is made by passing an annular sealing member blank around a piston body and by moving it towards a central outer cylindrical surface part of the piston body defined between first and second circular edges. The sealing member blank is d... | 12/11/2001 |
| 6135008 | Piston with lubricant-scraping ring and lubricant return ports A piston assembly including a piston having a work surface, a sidewall extending from the work surface, and ports in the sidewall. The piston assembly also includes a flexible lubricant-scraping ring clamped to the piston between the work surface and the ... | 10/24/2000 |
| 5813313 | Piston for a fluid power cylinder A piston for a fluid power cylinder, which possesses two separate piston parts, which are detachably set together in a joint region axially with a sealing action. Each piston part has a rigid carrying element, which is molded on a holding portion, which i... | 09/29/1998 |
| 5794517 | Piston assembly A piston assembly that is movable back and forth parallel to its axis in a cylindrical housing, comprising a piston-like support part made of a hard material and a guide ring made of a polymer. The guide ring surrounds the support part along a portion of ... | 08/18/1998 |
| 5284084 | Light weight piston A lightweight mud pump piston assembly for reciprocating inside of a cylinder. The piston has decreased weight because light weight materials are used to form the majority of the hub which is the heaviest part of the piston. The piston maintains its compr... | 02/08/1994 |
| 4741462 | Adjustable piston packing expander for caulking guns An adjustable piston packing expander for use with conventional caulking gun piston assemblies is disclosed. The packing expander threads onto the piston rod and includes a frusto-conical expansion surface which contacts the inner surface of the packing w... | 05/03/1988 |
| 4632647 | Side entry down hole pump for oil wells A side entry down-hole pump for oil wells which relies upon gravity rather than suction to receive incoming oil. A pump barrel is plugged at its bottom end and is anchored in the well. A pair of inlet slots in the side of the pump barrel admit oil to a pu... | 12/30/1986 |
| 4596269 | Differential pressure-actuated valve with clean bias chamber A differential pressure-actuated valve with a piston slidable to open or to close an inlet port. The piston slides in a cylindrical wall, and separates a bias chamber and a flow chamber. The piston is fitted with two oppositely-directed lip seals, one of ... | 06/24/1986 |
| 4541640 | Piston sealing arrangement A piston sealing arrangement particularly for pistons used in railway brake cylinders, comprising a flexible piston seal and a multi-function ring in the form of a separate wear band. The wear band is allocated on the pressure side of the piston seal to m... | 09/17/1985 |
| 4540352 | Pendular piston pump having a cup-shaped sealing element A pump comprises a housing member bounding an elongated cylinder bore, a piston member received in the cylinder bore for reciprocation substantially longitudinally thereof, a drive for the piston member, and a sealing arrangement between the piston member... | 09/10/1985 |
| 4529364 | Casing gas pump A casing gas pump is reciprocated by the pump jack of an oil well. Push rods slidable within rigid vertical cylinders are connected by a bridle bracket to bridle cables depended from the pump jack horsehead. Vertical reciprocation of the horsehead moves p... | 07/16/1985 |
| 4484512 | Seal, scraper, and guide for double-acting piston A double-acting piston and cylinder assembly has a piston which in turn has an outer piston surface centered on an axis, a radially outwardly open piston groove and a pair of axially oppositely facing piston ends. The cylinder has an inner surface centere... | 11/27/1984 |
| 4442674 | Driving device Driving device with a curved cylinder in which a spherical piston is guided and can be driven by a gaseous or liquid propellant, preferably for a pyrotechnical driving device for a back-tightening device of a safety belt system. The spherical piston, the ... | 04/17/1984 |
| 4380951 | Mud pump piston assembly A mud pump piston assembly is provided which facilitates replacement and secure holding of piston parts which wear rapidly. A double acting piston includes a piston rod, a pair of hollow piston members on the rod, and a pair of wear rings located between ... | 04/26/1983 |
| 4317409 | Mud pump piston assembly A mud pump piston assembly is provided which facilitates replacement and secure holding of piston parts which wear rapidly. A hollow piston member which fits on the end of a piston rod to seal against the cylinder, is held in place by a thin pressure ring... | 03/02/1982 |
| 4281590 | Piston construction for reciprocating pumps A pump piston construction for mud pumps and the like incorporating a resilient sealing member that establishes a pressure enhanced seal between the piston and pump cylinder. A bearing and anti-extrusion member composed of a relatively hard and flexible f... | 08/04/1981 |
| 4155557 | Fluid seal An annular seal having first and second annular end faces extending substantially perpendicular to the axis of symmetry of the seal, said annular end faces being connected to each other by two axially extending surfaces each having the same axis of symmet... | 05/22/1979 |
| 4126319 | Double-acting piston The double-acting measuring piston of this invention is slidably positioned in a cylinder and is provided with oppositely disposed mirror image sealing members which encompass a supporting body and are retained in abutment therewith by spaced flanges. The... | 11/21/1978 |
| 3974746 | Mono-seal pump piston A mono-seal pump piston comprising a mono-seal assembly including a central seal-supporting hub having a plurality of annular support ribs and a pair of resilient seals oppositely disposed on either side of the supporting hub, the seals including an outer... | 08/17/1976 |
| 3953213 | Piston construction for fluid power cylinders In order to preclude the entrapment of low pressure fluid in the interior of U-form seal members in the peripheral grooves of a piston for a fluid power cylinder and in turn prevent the inward deflection of such seals, there are provided cuts or notches i... | 04/27/1976 |
