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 |
| 7281464 | Inlet monitor and latch for a crust breaking system A system for selectively controlling movement of a piston between first and second positions, the system comprising a controller selectively actuated to enable fluid communication between a device and a source of pressurized fluid, a control valve for enabling fluid... | 10/16/2007 |
| 7118472 | Control system for pneumatically-powered door installation A mine door installation has a frame installed in a mine passageway. At least one door leaf is mounted on the frame for swinging movement between open and closed positions. Movement of the door leaf is powered by a pneumatic actuator. A pneumatically-powered control... | 10/10/2006 |
| 6595006 | Miniature reciprocating heat pumps and engines The present invention discloses a miniature thermodynamic device that can be constructed using standard micro-fabrication techniques. The device can be used to provide cooling, generate power, compress gases, pump fluids and reduce pressure below ambient ... | 07/22/2003 |
| 6338466 | Water well recharge throttle valve A water well recharge throttle valve (1) is configured as a hydraulic actuated flow control device (5) that permits calibrated throttling of water used in Artificial Storage and Recovery (ASR), Salt Water Barrier, Dedicated Recharge and Injection Wells to... | 01/15/2002 |
| 6327518 | Off-line teaching apparatus An off-line teaching apparatus includes an operation command-receiving device for receiving an operation command inputted via an input/output port from a key input device or a coordinate input device and successively storing the operation command in a buf... | 12/04/2001 |
| 5727442 | Safety device at hydraulic piston-cylinder units The invention relates to a safety arrangement on hydraulic piston-cylinder units. In particular for monitoring locking cylinders, e.g., of operating tools mounted on a grab bucket boom. A sensor for monitoring the piston position is provided on the piston... | 03/17/1998 |
| 5259345 | Pneumatically powered actuator with hydraulic latching An axially reciprocable working piston has opposed working surfaces facing opposed working chambers which are intermittently connected to respective cavities pressurized with compressed air. The working piston is connected to opposed seating pistons which... | 11/09/1993 |
| 5161449 | Pneumatic actuator with hydraulic control The present invention provides a pneumatically powered actuator having hydraulic control for both locking and controlling the velocity of an output rod without any sponginess. The invention includes a double-acting pneumatic actuator having a bore, a pist... | 11/10/1992 |
| 5022358 | Low energy hydraulic actuator An electronically controllable hydraulically powered asymmetrical valve actuating mechanism for use in an internal combustion engine of the type having engine intake and exhaust valves with elongated valve stems is disclosed. The actuator is a bistable el... | 06/11/1991 |
| 5022359 | Actuator with energy recovery return An electronically controlled actuator which compresses a fluid thereby storing potential energy as it transitions from a first to a second position is disclosed. The compressed fluid exerts a high force on the actuator and the potential energy is recovere... | 06/11/1991 |
| 4854218 | Piston and cylinder unit The invention relates to a piston and cylinder unit whose piston rod is provided with a rack extending along it. The rack is in mesh with a ring of teeth (such as the teeth of a toothed belt or the teeth of a gear wheel) adapted to revolve about one axis ... | 08/08/1989 |
| 4843951 | Servocylinder with an electric piston stroke limiting switch A servocylinder (1, 3, 4) with an electric piston end position transmitter is suggested. It is constructed as a piezoelectric converter (17 and 18). By means of applying voltage to the piezoelectric converter (17 and 18) the latter becomes a regulating el... | 07/04/1989 |
| 4785712 | Hydraulic operating apparatus for electric circuit breaker A hydraulic operating apparatus in which a differential piston is used as a drive unit, and in which the differential piston is driven by applying a high pressure fluid on a large piston face side through a hydraulic pressure control device for controllin... | 11/22/1988 |
| 4638888 | Hydraulic elevator A non-public hydraulic elevator has three emergency systems isolated from the primary drive system: a control system, a manually activated emergency descent system, and an emergency stop system. A hydraulic brake is provided a primary and emergency brake ... | 01/27/1987 |
| 4558759 | Hydrostatic steering device steering wheel travel limits The invention relates to a hydrostatic steering device having a servomotor connectable to wheels to be steered. The travel limits of the servomotor are sensed with position sensors which function to operate a locking apparatus which mechanically prevents ... | 12/17/1985 |
| 4515065 | Automatic centering servo actuator A high resolution servo actuator is responsive to an electronic control or manual control. An output shaft having fast response and infinite positioning for stroking a manual servo valve on a pump is rotated by hydraulic power. A set of hydraulic working ... | 05/07/1985 |
| 4375780 | Fail-fixed electrohydraulic servosystem A fail-fixed electrohydraulic servosystem in which a variation from a predetermined range of electrical input to the servosystem results in the output of the system being fixed in position. Fixing-in-position is accomplished by either hydraulically or mec... | 03/08/1983 |
| 4339984 | Drive, particularly for an industrial manipulator The drive comprises an air-operated driving unit imparting either a linear or a rotary motion to the working member of a manipulator and, at the same time, driving the rotor of an electromagnetic brake in accordance with displacement of the working member... | 07/20/1982 |
| 4267914 | Anti-kickback power tool control An impending kickback condition is the operation of a power tool or machine tool system is sensed and used to control or eliminate the kickback. The ability to sense an impending kickback condition can be used in all categories of power driven tools. The ... | 05/19/1981 |
| 4116113 | Spring actuated brake cylinder device with fluid pressure operable release piston lockout means A brake cylinder device including a brake piston operable by a spring force to an application position and to a release position in response to an opposing fluid pressure force, and a fluid pressure operable locking device operable responsively to release... | 09/26/1978 |
| 4106390 | Pneumatic linear actuator A digitally controllable pneumatic linear actuator in which a moving piston driven by compressed air is initially decelerated by the pressure of compressed air applied to the both sides thereof in the course of its advancing movement toward a predetermine... | 08/15/1978 |
| 4102248 | Protective system for pneumatically operated devices This disclosure relates to a system for protecting pneumatic cylinders and diaphragm valves against failure of both electrical and pneumatic supplies. In the event of a failure of the air supply, the loss of air pressure is detected and all drives are loc... | 07/25/1978 |
