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 |
| 7322190 | Hydraulic system for synchronized extension of multiple cylinders A hydraulic system maintains squareness while extending an object via two lift cylinder assemblies. A hydraulic circuit is connected to the cylinder assemblies, and includes synchronizer with multiple isolated chambers corresponding to the cylinder assemblies, a rod... | 01/29/2008 |
| 7299897 | Hydraulic platform lift incorporating positive displacement valve, and positive displacement valve for hydraulic platform lift A hydraulic platform lift, having hydraulic pump means and first and second hydraulic cylinders each having a piston member therein, each operatively coupled to a respective side edge of a platform to permit raising and lowering of the platform. A positive displacem... | 11/27/2007 |
| 7269949 | Synchronizing hydraulic cylinders Synchronizing hydraulic cylinders is provided by interconnected double-acting cylinders with dual pistons and central dividers which, with the pistons, divide the cylinders into four chambers. The outer chambers drive the pistons and the loads attached to the piston... | 09/18/2007 |
| 7258034 | Rack bar of power steering gearbox Disclosed is an apparatus for protecting impact to a rack bar of a power steering gearbox comprising an oil pressure cylinder, to which oil which has passed through an oil pressure pump and a rotary valve is supplied through a left port or right port, a rack bar dis... | 08/21/2007 |
| 7134280 | Hydraulic system for synchronized extension of multiple cylinders A lift table maintains levelness while lifting a support surface via two or more lift cylinder assemblies. A hydraulic circuit is connected to the cylinder assemblies, and includes synchronizer with multiple isolated chambers corresponding to the lift cylinder assem... | 11/14/2006 |
| 7047738 | Hydraulic system for synchronized extension of multiple cylinders A lift table maintains levelness while lifting a support surface via two or more lift cylinder assemblies. A hydraulic circuit is connected to the cylinder assemblies, and includes synchronizer with multiple isolated chambers corresponding to the lift cylinder assem... | 05/23/2006 |
| 6971453 | Control system for a three point implement hitch assembly A control system controls a three point implement hitch assembly of a tractor. The three point implement hitch assembly includes an upper link and two lower links. The upper link includes an adjustable length double acting hydraulic unit. The position of each lower ... | 12/06/2005 |
| 5335499 | Multiple hydraulic actuators with series/parallel operation The present invention includes a method for improving operating efficiency of a hydraulic actuator loop and an improved hydraulic actuator loop. The method includes transferring hydraulic fluid between a first and a second hydraulic actuator when the actu... | 08/09/1994 |
| 5311808 | Cylinder apparatus A cylinder apparatus capable of effectively restraining a loss of energy with a simple structure at a low cost. When a piston 16 of a main cylinder 11 cuts off a communication between a subchamber 20 and a supply/exhaust passage 32, a pressure of the subc... | 05/17/1994 |
| 5305605 | Hydraulic piston and cylinder unit An hydraulic piston and cylinder unit with a piston rod and first and second cylinders. The piston rod extends into the first cylinder, and the first cylinder extends into the second cylinder. The piston rod is connected to a first piston which divides th... | 04/26/1994 |
| 5133187 | Fluid circuit for maintaining constant pressure between two abutting solid objects A fluid circuit assembly for maintaining substantially constant pressure between two abutting solid objects, the circuit assembly comprising a master cylinder assembly, a plurality of working cylinder assemblies, piston rods extending from the working cyl... | 07/28/1992 |
| 5072649 | Double actuator with bypass lines for synchronized movement Hydraulic fluid under pressure is selectively supplied to multiple drive cylinders that are interconnected to one another and which have bypass lines allowing excess fluid to return to the source of hydraulic fluid as needed. Each drive cylinder receives ... | 12/17/1991 |
| 4825655 | Master/slave hydraulic system with rebound compensation A master/slave hydraulic system (10) comprises a master cylinder (12), slave cylinders (14-22), and a rebound compensator (72) for eliminating the effects of expansibility in the system on the lower stroke of the cylinders so that accurate depth control a... | 05/02/1989 |
| 4716732 | Vehicle hydraulic actuating system A master-slave hydraulic control system preferably for actuating a vehicle clutch utilizes single-acting hydraulic cylinders which are both connected to a fluid reservoir. The higher mounted cylinder has a bleed valve in the line connecting that cylinder ... | 01/05/1988 |
| 4706458 | Hydraulic system for controlling motor vehicle lifts in general A hydraulic system for lifts provided with two independently supported parallel platforms comprises at least two cylinder-piston units (80, 81) for raising the platforms, a metering device (7) for feeding identical quantities of fluid to said two units, a... | 11/17/1987 |
| 4567727 | Proportioned hydraulic system A hydraulic system is disclosed which provides automatic proportional actuation of pairs of hydraulic cylinders. The proportioning mechanism comprises one or more standard hydraulic cylinders.... | 02/04/1986 |
| 4500071 | Dual hydraulic lifts A dual lift for large loads such as vehicles has two lifting units set in opposition to each other to straddle the load. Each of the lifting unit has a vertical standard, cantilevered arms mounted on the standard for movement therealong, and a hydraulic a... | 02/19/1985 |
| 4463563 | Rephasing cylinder construction An improved rephasing master cylinder in which the cylinder wall approximate the end of the cylinder has a longitudinal bleed passage in the cylinder wall at one end connected to a lateral passage opening into the forward cylinder chamber while the opposi... | 08/07/1984 |
| 4423664 | Depth control apparatus A remotely controllable adjustable-stroke fluid cylinder system is described in various embodiments. The system includes a floating stop piston (48) and a main piston (24,224) which is controlled by a valving system (70) and which has visual indicator mea... | 01/03/1984 |
| 4255930 | Power device A closed circuit power system is disclosed herein having a hydraulic power device incorporated therein which includes an input piston and cylinder assemblage and an output piston and cylinder assemblage connected together by a fluid conduit so as to opera... | 03/17/1981 |
| 4251993 | Hydraulic boat lift with regulating system therefor An hydraulic boat lift utilizing readily available city water as the pressure fluid comprises one or more lift cylinders buried vertically under a body of water with the upper ends of the cylinders protruding into the water. To increase the pressure of th... | 02/24/1981 |
| 4241581 | Synchronizer for hydraulic actuators A synchronizer is provided for synchronizing the movements of two hydraulic actuators. The synchronizer consists of a two-piston pump which supplies hydraulic fluid to both actuators. The two pistons are mechanically connected so as to move simultaneously... | 12/30/1980 |
| 4192222 | Power piston apparatus A power piston apparatus, comprising two or more double acting hydraulic piston drive means in which the cross-sectional areas of the pistons are identical and the cylinder spaces or chambers of which are hydraulically interconnected in crossed fashion ab... | 03/11/1980 |
| 4151785 | Apparatus for remote position indication in a hydraulic positioning drive with a physically separated work cylinder A hydraulic positioning drive with a physically separated work cylinder which is connected via pressure oil lines, comprises a follow-up cylinder mounted at the positioning drive or in the immediate vicinity thereof, of the same type and the same volume a... | 05/01/1979 |
| 4102450 | Container washing and/or filling machines A machine for washing and/or filling containers such as beer kegs has a walking beam conveyor for moving the containers through the machine from one station to another. The walking beam is raised and lowered by two spaced-apart upright pneumatic rams and ... | 07/25/1978 |
| 4077651 | Hydraulic steering for plow A tractor-trailed plow having a steerable rear wheel is provided with a hydraulically powered steering system including master and slave cylinders arranged to steer the rear wheel in response to changes in the angular position of the plow with respect to ... | 03/07/1978 |
| 4006664 | Steering system including tandem hydraulic cylinders with self-synchronization The invention is especially suitable when front and rear wheels are hydraulically steered, each set by its own hydraulic cylinder, the two cylinders being connected in hydraulic tandem so that the same angularity of steering will be imparted to both sets ... | 02/08/1977 |
| 3983787 | Relay valve for a tow vehicle-trailer braking system A relay valve for transmitting an operational signal to a first brake applying servomotor in a trailer upon actuation of a second brake applying servomotor in a tow vehicle. The relay valve has a housing with a movable wall which sequentially interrupts t... | 10/05/1976 |
| 3950948 | Automatic remote control apparatus Hydraulic control apparatus for automatic remote control of a hydraulic actuating ram. The apparatus has a double-acting slave cylinder connectable hydraulically to an actuating ram, and a double-acting master cylinder the piston of which is mechanically ... | 04/20/1976 |
| 3945209 | Hydraulic linkage A hydraulic linkagae for transmitting reciprocating motion comprising a master unit, a slave unit, the master and slave units each comprising a pair of interconnected rod pistons reciprocally moveable within the cylinders in opposite directions by a force... | 03/23/1976 |
