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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7117881 | Control system The invention relates to a control system, especially a hydraulic control system for a transmission, including a valve assembly, especially a directional valve assembly, designed for controlling a cooling system for a clutch and for ensuring a minimum level of press... | 10/10/2006 |
| 6629411 | Dual displacement motor control A hydraulically operated fan for a cooling system in an automotive vehicle. Two hydraulic motors drive a common fan shaft. A control system provides means to bypass flow in parallel with both motors or direct flow to both or one of the motors dependent on... | 10/07/2003 |
| 5836347 | Fluid pressure supply system A vehicle fluid pressure supply system in which a fluid pressure supply pump (10) is connected via solenoid-operated flow control valve (15) with a plurality of separate fluid pressure operated circuits(A, B, C) each operating separate functions of the ve... | 11/17/1998 |
| 5738134 | Pressure compensation valve A pressure compensation valve has a check valve portion with a check valve bore with an inlet port and an outlet port in a valve body, a valve in the check valve bore for establishing and blocking communication between the inlet port and the outlet port, ... | 04/14/1998 |
| 5485864 | Pressure compensation valve A pressure compensation valve is capable of distributing of an output pressurized fluid of single pressurized fluid supply source to a plurality of hydraulic loads. The pressure compensation valve is constructed with a check valve portion formed by provid... | 01/23/1996 |
| 5398505 | Fluid pressure driving system A fluid pressure driving system for a vehicle includes a reservoir tank in which an amount of fluid is stored, a variable capacity oil pump sucking the fluid from the reservoir tank and discharging the resultant fluid, a control device for adjusting a qua... | 03/21/1995 |
| 5158104 | Pilot-operated spill valve assembly On a liquid cargo tank of a barge, a pressure responsive pilot valve operates through a combination of levers to unlatch a main valve clamp arm. One lever is a latch arm having a first position engaging and retaining a latch stud mounted on the clamp arm,... | 10/27/1992 |
| 5141016 | Divertor valve This diverter valve (12) is used in conjunction with a faucet (14) and provides for partial diversion of the water supply to a chemical block feeder (20). The diverter valve includes a body 24 having an inlet (26) an outlet 28 and a connecting intermediat... | 08/25/1992 |
| 5042521 | Switching apparatus for suction system in a vacuum pump A piston and a plurality of passages (first to fourth or fifth passages) are provided in a cylinder for reciprocation, which piston has a recessed portion formed in the central part thereof, so that the suction system of two suction pumps can automaticall... | 08/27/1991 |
| 4993447 | Pressure-regulating method and apparatus A pressure-regulating device for controlling fluid pressure flow from a source to two fluid pressure-operated devices (40, 50) includes first and second pressure regulators (22, 24), each having an inlet section, an outlet section and a control section wi... | 02/19/1991 |
| 4818384 | Recirculating sand filter A recirculating sand filter system for the treatment of waste water comprises a septic tank (10) for receiving waste water, a recirculating pump tank (18) connected to the septic tank for receiving effluent from the septic tank, and one or more sand filte... | 04/04/1989 |
| 4574894 | Ball actuable circulating dump valve A dump valve for use in a downhole motor having a spring-based piston responsive to fluid flow to close a fluid flow port and to a ball actuated force to reopen the port.... | 03/11/1986 |
| 4522221 | Timed flow control valve assembly A flow control valve assembly is provided for timing and regulating fluid flow from a valve inlet to primary and secondary fluid flow outlets. The valve assembly comprises a regulator valve which, upon initiation of fluid flow to the valve assembly, is sp... | 06/11/1985 |
| 4497337 | Floor trap primer valve A valve for automatically charging water into a sewer line trap from a water line containing water under variable pressure comprises a case having a longitudinal bore and means for connecting the case in series flow in the water line. A hollow shaft is mo... | 02/05/1985 |
| 4440450 | Borehole mining valve actuation A method of drilling and mining a subterranean ore deposit with a tool string having a drill bit and a combined mining nozzle and eductor section with the fluid flow being controlled to each valve by self-activating valves. Controlling the operation of th... | 04/03/1984 |
| 4403626 | Valve assembly A low restriction multiple outlet valve includes a housing having an interior chamber with an inlet opening thereinto, at least two outlets, and a flow directing member. The flow directing member snugly rotates about a portion of the chamber on an axis. T... | 09/13/1983 |
| 4306840 | Automatic connecting valve for hydraulic systems A differential pressure actuated valve is displaced from a spring-biased, stabilized position to a stabilized pump-changeover position in response to increasing pump pressure. The valve actuating pressure is varied in both directions of valve movement bet... | 12/22/1981 |
| 4291612 | Power brake system differential air pressure control valve assembly A power brake system has a brake booster operable by differential air pressure provided by a source of vacuum and a source of compressed air pressure. The differential air pressure control valve assembly of the invention maintains a substantially constant... | 09/29/1981 |
| 4263091 | Fluid flow control A plurality of spray nozzles are utilized to introduce a fluid into a vessel. Control valves are associated with each one of the plurality of spray nozzles. The control valves are either fully closed or fully open. The actual value of a process variable i... | 04/21/1981 |
| 4231441 | Flow divider valve assembly The ratio between flow rates of divided flow streams established by a flow divider valve is selectively changed through a manually adjustable control valve to establish in adjusted ratio that is maintained constant for any adjusted position of the control... | 11/04/1980 |
| 4215903 | Fluid-flow control valves Hydrostatic bearing arrangements in which there is a fluid-flow control valve adapted to exercise an automatic pressure responsive control over two fluid-flow outputs to a pair of bearings. The valve has a diaphragm located between two control surfaces fo... | 08/05/1980 |
