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Class Information
Number: 60/576
Name: Power plants > Pressure fluid source and motor > Pulsator > Automatic control of plural stage pressure generation or utilization > Of separate movement of plural delivery pistons
Description: Apparatus in which relative movement of two pistons or fluid displacers that deliver fluid toward a slave produce the staged pressure generation.

Sub-classes under this class:

Class Number Class Name Patents
60/577 Central externally driven piston drives surrounding piston means through a load responsive connector 18

Patents under this class:

Patent Number Title Of Patent Date Issued
8550116 Twin power valve with integrated pressure balance Oct. 8, 2013
8434831 Vehicle brake device for electronic hydraulic brake system May. 7, 2013
6062654 Brake control valve May. 16, 2000
5720170 Master cylinder and emulator with apply assist Feb. 24, 1998
5582009 Air-oil intensifier Dec. 10, 1996
5127506 Clutch actuating system Jul. 7, 1992
5083432 Tandem master cylinder with a third piston and chamber Jan. 28, 1992
4993226 Multi-piston air-oil pressure intensifier with automatically variable working stroke length Feb. 19, 1991
4805966 Slip-control hydraulic brake booster with braking-pressure responsive valve for fast-fill cylinder Feb. 21, 1989
4741161 Braking pressure generator for a hydraulic brake system for automotive vehicles May. 3, 1988
4455828 Hydraulic power unit Jun. 26, 1984
4419862 Hydraulic master cylinders Dec. 13, 1983
4268007 Valve actuating equipment May. 19, 1981
4253306 Master cylinder Mar. 3, 1981
4244185 Master cylinder for hydraulic brake system Jan. 13, 1981
4231543 Controllable hydraulic valve mechanism for reciprocating engines or pumps Nov. 4, 1980
4225022 Brake booster Sep. 30, 1980
4220007 Servo-assisted hydraulic master cylinder Sep. 2, 1980
4172364 Servo-assisted hydraulic master cylinder Oct. 30, 1979

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