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"Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible."
Simon Newcomb, astronomer ; Said in 1902, less than two years before the first flight at Kitty Hawk
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| Number | Title | Issue Date |
| 7284563 | Surge relief apparatus and method A surge relief apparatus for sensing, tracking and responding to pressure changes in a flow system. The apparatus includes a fluid storage tank that is in fluid communication with the flow system. The apparatus also includes a control valve that is connected to the ... | 10/23/2007 |
| 6994102 | Pressure regulating valve A pressure regulating valve which is comprised of a valve body being comprised of a cylinder, a spool slidably disposed in the cylinder with a clearance, the spool and the cylinder defining a pressure chamber and a space portion, and an urging member which urges the... | 02/07/2006 |
| 6425281 | Pressure insensitive gas control system A pressure insensitive gas process device that includes a gas sensor and restrictions upstream and downstream of the gas sensor. The restrictions result in pressure drops upstream and downstream of the gas sensor which shield the gas sensor from upstream ... | 07/30/2002 |
| 6170508 | Fluid flow regulating valve and method A valve for regulating the rate of flow and/or the pressure of oil flowing to a transmission or another consumer in the power train of a motor vehicle has a piston which defines with the valve housing a chamber for one or more springs and for oil being ad... | 01/09/2001 |
| 5785075 | Fluid-flow control valve A fluid-flow control valve device comprises a control orifice being fluidly disposed upstream of the outlet passage for variably restricting a flow of working fluid from the inlet passage to the outlet passage, a valve spool slidably accommodated in the s... | 07/28/1998 |
| 4840031 | Control system for fluid pressure operated actuator A control system for an actuator used to position a control surface on an aircraft such as a horizontal stabilizer, including a source of pressurized fluid, a pressure control for establishing a predetermined pressure level that is substantially one-half ... | 06/20/1989 |
| 4428393 | Quick vent response valve A quick vent response valve (12) is fluidically series connected between a vacuum regulator valve (14) and an exhaust gas recirculation valve (16) which comprises a fluid pressure control system (10). The quick response valve operates to vent the system m... | 01/31/1984 |
| 4046160 | Transmission clutches with sequence valve and piston-controlled pressure modulator Hydraulic controls in a transmission for engaging a clutch for the F-R, or forward or reverse, direction before a clutch for first, second, or third speed. Flow of hydraulic fluid to each direction clutch and to each speed clutch is by way of a reducing v... | 09/06/1977 |
| 4040439 | Cushion valve arrangement A cushion valve arrangement for reducing the rate of pressure build up and relieving pressure rebounds in a fluid conduit. The valve housing defines first and second fluid ports, a fluid passage communicating therebetween, and a cushion passage communicat... | 08/09/1977 |
