Did You Know...
...that the Eveready Battery began as an invention called the "electric flowerpot," which was a tube with a battery and light bulb inside? The idea was to fasten this gizmo to the side of a flowerpot so it would illuminate the flowers from the bottom. The idea died on the vine and the businessman who licensed the flower pot, Conrad Huber, was left with a pile of useless tubes -- until he found a way to market them as batteries to light the world!
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 |
| 7845169 | Drift compensation control method for a machine A method of controlling a machine having a hydraulically actuated linkage includes lowering a load suspended by the leakage at least in part by leaking hydraulic fluid from a portion of a hydraulic actuation system, and generating a drift compensation control signal... | 12/07/2010 |
| 7273125 | Variable resolution control system The present disclosure is directed to a control system for a power machine that provides selected resolution of the adjusted speed control and other controls, such as attachment controls, to provide more options to the operator for fine positioning. The present disc... | 09/25/2007 |
| 7185939 | Hydraulic drive system for vehicle roofs The invention relates to a hydraulic drive system used for the covers of vehicle openings, in particular for vehicle roofs with a construction that can be opened. In said system, the actuator that is designed to displace the cover is supplied with a bulk current, wh... | 03/06/2007 |
| 7143579 | Velocity control of agricultural machinery The apparatus is an automatic velocity control system for an agricultural machine. Three feedback circuits are used to increase reliability and repeatability of the apparatus despite variations in load and ground conditions and non-linear responses of control compon... | 12/05/2006 |
| 7130721 | Electrohydraulic control system Consistent with an aspect of the disclosure, a method for controlling a hydraulic cylinder is provided. The hydraulic cylinder is provided with a chamber and configured to receive fluid from a valve. The method includes receiving a user input and determining a desir... | 10/31/2006 |
| 7051525 | Method and apparatus for monitoring operation of percussion device A method and an apparatus for monitoring the operation of a percussion device, which percussion device comprises a percussion piston and a pressure channel for supplying pressure medium to the percussion device for moving the percussion piston. The method and the ap... | 05/30/2006 |
| 7032379 | Oil supply unit for a running power transmission There is provided an oil supply unit for a running power transmission of a vehicle. The oil supply unit includes a housing, a hydraulic pump of a variable displacement type, a detecting mechanism and a control mechanism. The detecting mechanism is constructed to mon... | 04/25/2006 |
| 6945040 | Ram moving method for hydraulic machine, ram movement controller, method for preventing trapping of axial plunger pump used for the machine, and the pump If an instruction to move a ram (5U) is issued, a ram instructed speed is instructed to be suppressed to a certain warming-up speed not higher than a target speed until a release speed determination section (75) determines that a moving speed of the ra... | 09/20/2005 |
| 6942596 | Hydromechanical transmission electronic control system for high speed vehicles An electronic transmission control system that can achieve a transmission ratio based on the operator inputs and the current vehicle operating conditions. The transmission constantly connects the engine to the load, and the transmission ratio is only varied by a cha... | 09/13/2005 |
| 6883313 | Electro-hydraulic pump displacement control with proportional force feedback A pump displacement control arrangement uses the inherent swivel torques of a fluid translating device in cooperation with a proportional force feedback to more consistently and precisely control the displacement of the fluid translating device. The subject inventio... | 04/26/2005 |
| 6852064 | Hydromechanical transmission electronic control system for high speed vehicles An electronic transmission control system that can achieve a transmission ratio based on the operator inputs and the current vehicle operating conditions. The transmission constantly connects the engine to the load, and the transmission ratio is only varied by a cha... | 02/08/2005 |
| 6644025 | Control arrangement for at least two hydraulic consumers and pressure differential valve for said control arrangement A control arrangement to supply-pressure medium to at least two hydraulic consumers having a variable-displacement pump controlled according to required flow and the setting of which can be changed by a, pump controller as a function of highest load press... | 11/11/2003 |
| 6085520 | Slide driving device for presses A slide driving device employs a variable-displacement pump/motor for driving a rotating element of the slide driving device. The displacement volume of the variable-displacement pump/motor, whose output drives the slide, is varied in response to deviatio... | 07/11/2000 |
| 6073442 | Apparatus and method for controlling a variable displacement pump A method for controlling the displacement of a variable displacement hydraulic pump to produce a desired flow of fluid is disclosed. The method includes the steps of: determining that the machine is being operated in a digging cycle; determining a desired... | 06/13/2000 |
| 6050090 | Control apparatus for hydraulic excavator Pressure sensors sense a pilot pressure Pa corresponding to the amount of boom raising operation of a boom operation lever and a pilot pressure Pb corresponding to the amount of arm pulling operation of an arm operation lever. When the condition of Pa>Pb ... | 04/18/2000 |
| 5666806 | Control system for a hydraulic cylinder and method Apparatus and method for controlling at least one hydraulic cylinder by the hydraulic fluid discharged by a hydraulic pump through a control valve. The hydraulic control system includes sensors to sense the conditions of the system and produce responsive ... | 09/16/1997 |
| 5647208 | Hydraulic pumping unit A Hydraulic Pumping Unit equipped with a flywheel, a high-slip electric motor and a reversible hydraulic pump such that during the downstroke of the Unit, the hydraulic pump operates as a hydraulic motor, accelerating the flywheel and accumulating in this... | 07/15/1997 |
| 5542251 | Control and regulation device for a vehicle travel drive A control and regulation device for a vehicle travel drive, which comprises two hydrostatic transmissions (3, 4) of adjustable transmission ratios, each comprising a hydraulic pump (12, 13) and a hydraulic motor (14, 15), which are in driving connection w... | 08/06/1996 |
| 5077975 | Control for a load-dependently operating variable displacement pump Disclosed is a preferably electrohydraulic control for a load-dependently operating variable displacement pump, which is equipped with a differential pressure control device for ensuring a predetermined pressure drop at the control edge of a directional v... | 01/07/1992 |
| 4938101 | Continuously variable speed transmission A continuously variable speed transmission comprises a continuously variable speed change mechanism, a ratio control actuator, a controller controlling operational direction and speed of the ratio control actuator, and a speed reduction ratio detection se... | 07/03/1990 |
| 4741159 | Power transmission An electrohydraulic servo system which includes a plurality of pressure compensated flow control servo valves for feeding hydraulic fluid from a variable displacement pump to associated actuators and loads. A closed-loop velocity-control servo system is c... | 05/03/1988 |
| 4688380 | Control means for a drive system with impressed pressure A secondarily controlled hydrostatic machine with variable volume is connected to a line with impressed system pressure which is fed by a primary unit. By switching over the primary unit the secondary unit is subjected to a displacement amount which resul... | 08/25/1987 |
| 4537029 | Power transmission An electrohydraulic control system which includes first and second electrically controlled fully variable hydraulic pumps adapted to be driven by the vehicle engine. In the specific embodiment of the invention herein disclosed, the first pump is coupled t... | 08/27/1985 |
| 4528814 | Hydrostatic drive systems A hydrostatic drive in which the ratio of pressure to force is constant is provided having a consumer of hydraulic energy connected to a high pressure system line, a first displacement means interposed between the consumer and the pressure system line, sp... | 07/16/1985 |
| 4507920 | Steering control apparatus An improved power steering apparatus includes a variable displacement pump. During a steering operation, a flow control valve effects operation of a motor assembly to vary the displacement of the pump as a function of variations in the demand for power st... | 04/02/1985 |
| 4399653 | Automatic adjusting deceleration control for a hydrostatically powered device A hydrostatic drive with an automatic adjusting deceleration control device and method for accomplishing the same. The drive includes a prime mover, a variable displacement hydraulic pump, a hydraulic actuator for driving a load through an operating cycle... | 08/23/1983 |
| 4215543 | Method and apparatus for linear and nonlinear control of a hydraulic press A method and apparatus for linear and nonlinear control of a hydraulic press is provided with a feedback loop allowing the operation of a variable displacement pump to be selectively controlled with respect to either hydraulic pressure moving a piston in ... | 08/05/1980 |
| 3959967 | Reciprocating apparatus particularly for pump unit A system is provided for maintaining a permanent reciprocatory movement of a mechanical arrangement, particularly a pump unit. A main driving wheel is coupled to the mechanical arrangement and fastened on the shaft of a hydraulic motor which is supplied b... | 06/01/1976 |
| 3955369 | Actuator average pressure maintenance in closed loop system A closed loop hydraulic control system for a piston type fluid actuator maintains an average pressure on the piston during all operating conditions of the actuator. The system includes a first pump which controls the actuator and a makeup pump which suppl... | 05/11/1976 |
| 3952513 | Variable speed and torque feed system A fluid system having a variable displacement fluid pump connected in a closed-loop fashion to a pair of inlet ports of a fluid motor of the type having two output shafts and a fluid pressure responsive means operable upon communication with fluid pressur... | 04/27/1976 |
| 3943716 | Control arrangement, preferably for remote controlled, hydrostatically operated hoist machineries The cable drum for the hoist cable of a hoisting device is driven by a hydraulic motor with a constant displacement that in its turn obtains drive fluid from a pump with a variable displacement. The displacement of the pump, and with that the speed and ro... | 03/16/1976 |
