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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 7341236 | Pilot operated valve with a pressure balanced poppet A pilot operated valve has a main poppet that selectively controls flow of fluid between first and second ports in response to pressure in a control chamber on one side of the main poppet. The main poppet has an aperture extending between the control chamber and the... | 03/11/2008 |
| 7146677 | Energy saving vacuum system for particle, mist, and fume collection An improved energy-efficient vacuum system for machine shop dust, particulate matter, and the like. Blast gates, including large-diameter blast gates, control the flow of vacuum generated by a dust collector to individual machines that may or may not accommodate vac... | 12/12/2006 |
| 7144207 | Fluid chuck device and method In a valve disposed between a fluid supply and a socket of a chuck and configured to regulate the flow of the fluid to the socket. There is a seal screw for modulating a preload tension. This seal screw has a first sealing surface. The valve further includes a secon... | 12/05/2006 |
| 7007919 | Slit valve method and apparatus An actuator assembly for a slit valve door is configured to maintain a slit valve in a closed condition notwithstanding a high pressure differential between adjacent chambers that the slit valve isolates from each other. The slit valve door actuator assembly include... | 03/07/2006 |
| 6997209 | Locking device of an air-operated normally-closed valve for a gas cylinder A locking device of an air-operated normally-closed valve for a gas cylinder includes a housing; a piston assembly provided in the housing; a tapered axial member having an annular outer tapered surface and positioned coaxially with the piston assembly axis; a lock ... | 02/14/2006 |
| 6742763 | Linear spring-loaded actuator for a valve A linear spring-loaded actuator (10) for a valve (12) comprises a housing (14) and an actuating spindle (16) slidably supported in the housing (14). A cap (22) is associated with the housing (14). Spring means (36 | 06/01/2004 |
| 6568422 | Valve locking mechanism and method The present invention provides an improved lock mechanism and method for high security locking of a valve in a desired position. A moveable locking member is operably mounted within a housing for moving between a locking position and an operating position... | 05/27/2003 |
| 5797285 | Device for locking rotatable shafts having stop plates A locking device for a valve having a rotatable shaft including a stop plate, and a stop secured to a housing, including a hollow body having a first chamber for receiving the shaft, a threaded aperture extending into the first chamber for receiving a scr... | 08/25/1998 |
| 5381824 | Regulator A gas regulator has a pressure control diaphragm biased by a spring. The force of the spring upon the diaphragm, and thus the operating pressure for the regulator, is controlled by a linear travel bushing bearing against the spring. The bushing is prefera... | 01/17/1995 |
| 5190263 | Locking mechanism for an actuator A locking mechanism for an actuator prevents the unauthorized operation of the actuator and also permits a viewer to determine whether the actuator is in a locked open, locked closed or unlocked position. The invention utilizes a clear cover guard which i... | 03/02/1993 |
| 4648742 | Tainter gate system Illustrative embodiments of the invention are directed to a technique for raising and lowering large tainter gates. Typically, two groups of lifting apertures are formed in the gate. A lifting mechanism, resiliently mounted on the tainter gate pier, inser... | 03/10/1987 |
| 4625626 | Control/fire damper for ducts inventilation installations The control/fire damper (10) comprises a tubular shell (11) constituting a flow duct (12), a shaft (13) disposed within the flow duct (12) and carried by the shell (11), and a closing plate (14) mounted on the shaft (13), and which in the case of fire dam... | 12/02/1986 |
| 4483509 | Guillotine valve assembly A valve assembly for controlling the flow of fluid has a housing defining a valving chamber accommodating a transversely movable valve plate. A manually operated lever connected to the valve plate with a rod is operable to move the valve plate between ope... | 11/20/1984 |
| 4372342 | Balancing damper with quick set adjustment bracket A damper for adjusting and balancing the air flow rates in air conditioning and similar large gas flow systems is disclosed which comprises at least one pivotable blade located in a frame which is capable of being fitted onto or into one of the ducts in s... | 02/08/1983 |
