US3232058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Master cylinder
Assignee: ZF Active Safety US Inc
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Filing: 1962-08-09
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Granted: 1966-02-01
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Expires: 1982-08-09
Abstract
No abstract record available.
Inventors
- 👤 Jr David T Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:03
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A MOTOR VEHICLE MASTER CYLINDER, COMPRISING A BODY HAVING AN ELONGATED BORE, A PAIR OF PLUNGERS SLIDABLE IN SAID BORE AND SPACED FROM EACH OTHE RTO FORM THEREBETWEEN A FIRST PRESSURE CHAMBER, A FIRST SPRING BETWEEN AND ENGAGING SAID PLUNGERS AND BIASING THEM AWAY FORM EACH OTHER, A PUSH ROD EXTENDING INTO ONE END OF SAID BORE, AND INTO ENGAGEMENT WITH ONE OF SAID PLUNGERS TO MOVE IT TOWARDS SAID OTHER PLUNGER TO DISPLACE FLUID FROM SAID FIRST CHAMBER, THE OTHER PLUNGER FORMING WITH THE OTHER END OF SAID BORE A SECOND PRESSURE CHAMBER, EACH OF SAID PRESSURE CHAMBERS HAVING FLUID CONNECTION WITH ONE PAIR OF THE VEHICLE WHEEL CYLINDERS, SAID OTHER PLUNGER COMPRISING TWO RELATIVELY AXIALLY MOVABLE ELEMENTS, ONE OF WHICH IS A FLUID DISPLACING ELEMENT AND THE OTHER OF WHICH CARRIES A VALVE ADJACENT AND NORMALLY SPACED FROM THE OTHER END OF SAID BORE, MEANS COMPRISING A REPLENISHING PORT COMMUNICATING WITH SAID SECOND CHAMBER ADJACENT SAID VALVE, A SECOND SPRING BIASING SAID OTHER ELEMENT TOWARDS SAID PORT, MEANS NORMALLY LIMITING SUCH MOVE-
Claim 2
Dependent Claim
174 words
A MOTOR VEHICLE MASTER CYLINDER, COMPRISING A BODY HAVING AN ELONGATED BORE, A PAIR OF PLUNGERS SLIDABLE IN SAID BORE AND SPACED FROM EACH OTHE RTO FORM THEREBETWEEN A FIRST PRESSURE CHAMBER, A FIRST SPRING BETWEEN AND ENGAGING SAID PLUNGERS AND BIASING THEM AWAY FORM EACH OTHER, A PUSH ROD EXTENDING INTO ONE END OF SAID BORE, AND INTO ENGAGEMENT WITH ONE OF SAID PLUNGERS TO MOVE IT TOWARDS SAID OTHER PLUNGER TO DISPLACE FLUID FROM SAID FIRST CHAMBER, THE OTHER PLUNGER FORMING WITH THE OTHER END OF SAID BORE A SECOND PRESSURE CHAMBER, EACH OF SAID PRESSURE CHAMBERS HAVING FLUID CONNECTION WITH ONE PAIR OF THE VEHICLE WHEEL CYLINDERS, SAID OTHER PLUNGER COMPRISING TWO RELATIVELY AXIALLY MOVABLE ELEMENTS, ONE OF WHICH IS A FLUID DISPLACING ELEMENT AND THE OTHER OF WHICH CARRIES A VALVE ADJACENT AND NORMALLY SPACED FROM THE OTHER END OF SAID BORE, MEANS COMPRISING A REPLENISHING PORT COMMUNICATING WITH SAID SECOND CHAMBER ADJACENT SAID VALVE, A SECOND SPRING BIASING SAID OTHER ELEMENT TOWARDS SAID PORT, MEANS NORMALLY LIMITING SUCH MOVE-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-31 | 1969-08-02 | 1970-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-31 | 1973-08-02 | 1974-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-31 | 1977-08-02 | 1978-02-01 | $7700.00 | Window Closed / Lapsed |