Patent US3214913A successfully refreshed from Google Patents.
US3214913A
Expired / Lapsed
US
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Hydraulic master cylinder
Assignee: Holley Performance Products Inc
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Filing: 1961-11-21
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Granted: 1965-11-02
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Expires: 1981-11-21
Abstract
No abstract record available.
Inventors
- 👤 Dennis J Hayman
- 👤 Raymond L Ensinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:09
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/16; B60T11/224; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7771; Y10T137/7772; Y10T137/7774; Y10T137/7777; Y10T137/7781; Y10T137/7793; Y10T137/7801
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
IN A HYDRAULIC MANUAL BRAKING SYSTEM HAVING A FOOT PEDAL, WHEEL CYLINDERS AND LINES THERETO, A MASTER CYLINDER ASSEMBLY COMPRISING A RESERVOIR, A PAIR OF CONCENTRIC BORES, A TWO-DIAMETER PISTON SLIDABLY MOUNTED IN SAID BORES, LINKAGE MEANS CONNECTING SAID FOOT PEDAL TO SAID TWO-DIAMETER PISTON MEANS ASSOCIATED WITH SAID TWO-DIAMETER PISTON FOR PREVENTING THE BUILD-UP OF PRESSURE ABOVE A DESIGNATED LEVEL IN SAID LINES AND WHEEL CYLINDERS, MEANS FOR PREVENTING SAID FOOT PEDAL FROM BEING DEPRESSED FURTHER ONCE SAID DESIGNATED PRESSURE IS ATTAINED AND ADDITIONAL MEANS FOR RELEASING SAID PRESSURE IMMEDIATELY UPON RELEASE OF SAID FOOT PEDAL.
Claim 2
Dependent Claim
97 words
IN A HYDRAULIC MANUAL BRAKING SYSTEM HAVING A FOOT PEDAL, WHEEL CYLINDERS AND LINES THERETO, A MASTER CYLINDER ASSEMBLY COMPRISING A RESERVOIR, A PAIR OF CONCENTRIC BORES, A TWO-DIAMETER PISTON SLIDABLY MOUNTED IN SAID BORES, LINKAGE MEANS CONNECTING SAID FOOT PEDAL TO SAID TWO-DIAMETER PISTON MEANS ASSOCIATED WITH SAID TWO-DIAMETER PISTON FOR PREVENTING THE BUILD-UP OF PRESSURE ABOVE A DESIGNATED LEVEL IN SAID LINES AND WHEEL CYLINDERS, MEANS FOR PREVENTING SAID FOOT PEDAL FROM BEING DEPRESSED FURTHER ONCE SAID DESIGNATED PRESSURE IS ATTAINED AND ADDITIONAL MEANS FOR RELEASING SAID PRESSURE IMMEDIATELY UPON RELEASE OF SAID FOOT PEDAL.
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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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |