US3262273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Master cylinders for hydraulic braking systems
Assignee: Girling Ltd
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Filing: 1964-12-30
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Granted: 1966-07-26
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Expires: 1984-12-30
Abstract
No abstract record available.
Inventors
- 👤 Harvey Dennis Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/28; B60T11/16; B60T11/20; B60T11/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
A MASTER CYLINDER FOR AN HYDRAULIC BRAKING SYSTEM COMPRISING A CYLINDER, A PRESSURE SPACED IN THE CYLINDER, AT LEAST ONE PISTON WORKING IN THE CYLINDER BORE TO APPLY PRESSURE TO LIQUID IN THE PRESSURE SPACE, A RESERVOIR FOR LIQUID COMMUNICATING WITH SAID PRESSURE SPACE THROUGH A VALVE PORT CONTROLLED BY A TIPPING VALVE, A STEM ON SAID TIPPING VALVE EXTENDING INTO SAID CYLINDER BORE THROUGH AN OPENING IN THE WALL OF THE CYLINDER, A RETURN SPRING ADAPTGED TO URGE SAID PISTON INTO A RETRACTED POSITION, AN ABUTMENT DEFINED BY A PART OF THE CYLINDER WALL AROUND SAID OPENING AND AGAINST WHICH A MID PORTION OF THE STEM OF THE VALVE IS ADAPTED TO ENGAGE WHEN SAID PISTON IS IN SAID RETRACTED POSITION, AND AT LEAST ONE OF THE STEM AND THE WALL OF THE OPENING THROUGH WHICH THE STEM EXTENDS BEING CONED WHEREBY THE LOAD APPLIED TO THE STEM BY THE RETURN SPRING FOR THE PISTON IS WHOLLY CONTAINED WITHIN THE STEM AND THERE IS NO MOVEMENT TENDING TO ROCK THE STEM ABOT ITS ENGAGEMENT WITH THE WALL OF THE OPENING
Claim 2
Dependent Claim
181 words
A MASTER CYLINDER FOR AN HYDRAULIC BRAKING SYSTEM COMPRISING A CYLINDER, A PRESSURE SPACED IN THE CYLINDER, AT LEAST ONE PISTON WORKING IN THE CYLINDER BORE TO APPLY PRESSURE TO LIQUID IN THE PRESSURE SPACE, A RESERVOIR FOR LIQUID COMMUNICATING WITH SAID PRESSURE SPACE THROUGH A VALVE PORT CONTROLLED BY A TIPPING VALVE, A STEM ON SAID TIPPING VALVE EXTENDING INTO SAID CYLINDER BORE THROUGH AN OPENING IN THE WALL OF THE CYLINDER, A RETURN SPRING ADAPTGED TO URGE SAID PISTON INTO A RETRACTED POSITION, AN ABUTMENT DEFINED BY A PART OF THE CYLINDER WALL AROUND SAID OPENING AND AGAINST WHICH A MID PORTION OF THE STEM OF THE VALVE IS ADAPTED TO ENGAGE WHEN SAID PISTON IS IN SAID RETRACTED POSITION, AND AT LEAST ONE OF THE STEM AND THE WALL OF THE OPENING THROUGH WHICH THE STEM EXTENDS BEING CONED WHEREBY THE LOAD APPLIED TO THE STEM BY THE RETURN SPRING FOR THE PISTON IS WHOLLY CONTAINED WITHIN THE STEM AND THERE IS NO MOVEMENT TENDING TO ROCK THE STEM ABOT ITS ENGAGEMENT WITH THE WALL OF THE OPENING
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |