US3385308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake pressure proportioning device
Assignee: Girling Ltd
•
Filing: 1965-12-27
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Granted: 1968-05-28
•
Expires: 1985-12-27
Abstract
No abstract record available.
Inventors
- 👤 Farr Glyn Phillip Reginald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:33
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/26; Y; Y10; Y10T; Y10T137/00; Y10T137/0753; Y10T137/0777
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A HYDRAULIC BRAKE PRESSURE PROPORTIONING DEVICE COMPRISING A BODY, FIRST AND SECOND CHAMBERS IN SAID BODY FOR CONNECTION RESPECTIVELY TO A MASTER CYLINDER AND TO AT LEAST ONE SLAVE CYLINDER, A BORE BETWEEN SAID CHAMBERS, A PLUNGER SLIDABLE IN SAID BORE AND HAVING OPPOSITE FACES OF SUBSTANTIALLY EQUAL EFFECTIVE AREA EXPOSED TO SAID CHAMBERS SO THAT DISPLACEMENT OF THE PLUNGER FROM A NORMAL RESTING POSITION IN ONE DIRECTION TO INCREASE THE VOLUME OF THE FIRST CHAMBER DECREASES THE VOLUME OF THE SECOND CHAMBER BY AN EQUAL AMOUNT, A SPRING BIASSING SAID PLUNGER IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION, AND A DECELERATION RESPONSIVE VALVE NORMALLY INTERCONNECTING SAID FIRST AND SECOND CHAMBERS, THE DECELERATION RESPONSIVE VALVE HAVING A VALVE SEAT AND AN INERTIA MEMBER ARRANGED TO MOVE TO CLOSE SAID VALVE SEAT WHEN THE DEVICE IS SUBJECTED TO A PREDETERMINED DECELERATION.
Claim 2
Dependent Claim
141 words
A HYDRAULIC BRAKE PRESSURE PROPORTIONING DEVICE COMPRISING A BODY, FIRST AND SECOND CHAMBERS IN SAID BODY FOR CONNECTION RESPECTIVELY TO A MASTER CYLINDER AND TO AT LEAST ONE SLAVE CYLINDER, A BORE BETWEEN SAID CHAMBERS, A PLUNGER SLIDABLE IN SAID BORE AND HAVING OPPOSITE FACES OF SUBSTANTIALLY EQUAL EFFECTIVE AREA EXPOSED TO SAID CHAMBERS SO THAT DISPLACEMENT OF THE PLUNGER FROM A NORMAL RESTING POSITION IN ONE DIRECTION TO INCREASE THE VOLUME OF THE FIRST CHAMBER DECREASES THE VOLUME OF THE SECOND CHAMBER BY AN EQUAL AMOUNT, A SPRING BIASSING SAID PLUNGER IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION, AND A DECELERATION RESPONSIVE VALVE NORMALLY INTERCONNECTING SAID FIRST AND SECOND CHAMBERS, THE DECELERATION RESPONSIVE VALVE HAVING A VALVE SEAT AND AN INERTIA MEMBER ARRANGED TO MOVE TO CLOSE SAID VALVE SEAT WHEN THE DEVICE IS SUBJECTED TO A PREDETERMINED DECELERATION.
References Cited (Backward Citations)
US2218194A
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US3087761A
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US3168351A
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US3163473A
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US3317251A
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US3252740A
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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) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |