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US3618320A Expired / Lapsed US ⏱️ 0.0 years remaining

Hydraulic braking systems for vehicles

Assignee: Girling Ltd
•
Filing: 1970-03-10
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Granted: 1971-11-09
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Expires: 1990-03-10
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Abstract

Abstract A POWER-OPERATED TANDEM MASTER CYLINDER INCLUDES FIRST AND SECOND PRESSURE SPACES LOCATED RESPECTIVELY BETWEEN A MAIN PISTON AND A SECONDARY PISTON, AND BETWEEN THE SECONDARY PISTON AND A CLOSED END OF THE CYLINDER BORE IN WHICH THE PISTONS WORK. THE SECONDARY PISTON COMPRISES A TELESCOPIC ASSEMBLY OF WHICH THE LENGTH INCREASES PROGRESSIVELY AS THE SECONDARY PISTON IS ADVANCED IN THE CYLINDER BORE UNDER THE INFLUENCE OF PRESSURE FLUID IN THE FIRST PRESSURE SPACE. THIS MAINTAINS AT A SUBSTANTIALLY CONSTANT MINIMUM, THE DISTANCE BETWEEN AN AXIAL EXTENSION CARRIED BY THE MAIN PISTON AND THE ADJACENT END OF THE SECONDARY PISTON WITH WHICH THE AXIAL EXTENSION ENGAGES UPON FAILURE OF AT LEAST THE FIRST PRESSURE SPACE.

Inventors

  • 👤 Brian Ingram

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 18:37
CPC Classifications
B; B60; B60T; B60T13/00; B60T13/10; B60T13/12; B60T13/14; B60T13/142; B60T13/145; B60T13/146; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-11-08 1975-05-10 1975-11-09 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-11-08 1979-05-10 1979-11-09 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-11-08 1983-05-10 1983-11-09 $7700.00 Window Closed / Lapsed

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