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Class Information
Number: 60/574
Name: Power plants > Pressure fluid source and motor > Pulsator > Automatic control of plural stage pressure generation or utilization
Description: Apparatus comprising structure of the master or slave that, responsive to the position of an element or condition of the fluid provides a shift in the rate of movement of the actuator driving the master or of the output member of the slave relative to the rate of displacement of pulse fluid.

Sub-classes under this class:

Class Number Class Name Patents
60/575 Automatic trapping of fluid back of delivery piston forms temporary pulsator driving piston during one stage 9
60/576 Of separate movement of plural delivery pistons 19
60/578 Unitarily movable displacer delivers fluid from two delivery chambers, one chamber being ineffective under high pressure delivery 83

Patents under this class:

Patent Number Title Of Patent Date Issued
8544265 Hydraulic pressure multiplier Oct. 1, 2013
7857113 Hydraulic clutch control system, comprising servo means which are disposed between the master cylinder and the slave cylinder of the system Dec. 28, 2010
7739871 Press-driven tool actuation system Jun. 22, 2010
7442457 Fuel cell system with compressor and also a method for operating such a fuel cell system Oct. 28, 2008
7159704 Hydraulic system Jan. 9, 2007
6928813 Stroke gain device for a master cylinder Aug. 16, 2005
6655139 Servomotor with a finger-forming locking sleeve Dec. 2, 2003
6363720 Master cylinder for automotive vehicle Apr. 2, 2002
6295813 Press driven tool actuator module Oct. 2, 2001
6282896 Idle stroke shortening device in brake system Sep. 4, 2001
6231135 Hybrid brake system May. 15, 2001
6195995 Hydraulic brake system with device for active braking Mar. 6, 2001
6052994 Hydraulic brake apparatus for a vehicle Apr. 25, 2000
5916141 Tandem master cylinder of brake system in an automobile Jun. 29, 1999
5649424 Two-stage pressure cylinder Jul. 22, 1997
5396771 Apparatus for transmitting hydraulic pressure Mar. 14, 1995
5086688 Hydraulic booster device with valve means for damping of input rod Feb. 11, 1992
5079914 Hydraulic brake system with fast-fill valve Jan. 14, 1992
5036664 Fluid pressure actuator with removable piston and cartridge unit Aug. 6, 1991
4874207 Hydraulic braking system for an automotive vehicle Oct. 17, 1989
4729609 Slip-controlled brake system with fast-fill cylinder Mar. 8, 1988
4671066 Hydraulic power booster Jun. 9, 1987
4667466 Quick fill type master cylinder May. 26, 1987
4659152 Hydraulic brake system with slip control Apr. 21, 1987
4642989 Hydraulic power booster Feb. 17, 1987
4643488 Hydraulic vehicle servo brake Feb. 17, 1987
4474004 Power-operated boosters Oct. 2, 1984
4458490 Dual power brake booster and method of generating brake actuating pressure Jul. 10, 1984
4455830 Master cylinder Jun. 26, 1984
4455831 Differential master cylinder Jun. 26, 1984
4294071 Hydraulic booster travel ratio check valve Oct. 13, 1981
4274521 Synchronized hydropneumatic control of clutch and gearbox Jun. 23, 1981
4254624 Two-stage master cylinder and valve member therefor Mar. 10, 1981
4229940 Hydraulic master cylinder Oct. 28, 1980
4175791 Hydraulic brake pressure control apparatus for motor vehicles Nov. 27, 1979
4170386 Control for a two stage master cylinder Oct. 9, 1979
4086770 Dual circuit quick take-up master cylinder May. 2, 1978
4078385 Brake power boosting mechanism Mar. 14, 1978
4051877 Gas compression apparatus Oct. 4, 1977
4050251 Hydraulic booster Sep. 27, 1977
4028891 Booster brake unit Jun. 14, 1977
4027482 Variable ratio hydraulic master-cylinder Jun. 7, 1977
3981148 Combined fluid motor and pumping apparatus Sep. 21, 1976
3950948 Automatic remote control apparatus Apr. 20, 1976
3945209 Hydraulic linkage Mar. 23, 1976
3938333 Master cylinder Feb. 17, 1976

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