US3137369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic brake for automotive vehicles
Assignee: Stromberg Hydraulic Brake and Coupling Co
•
Filing: 1961-09-29
•
Granted: 1964-06-16
•
Expires: 1981-09-29
Abstract
No abstract record available.
Inventors
- 👤 Ralph O Stromberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:17
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/108
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A HYDRAULIC AUTOMOTIVE BRAKE SYSTEM, AN OPENENDED MASTER CYLINDER, A MASTER PISTON THEREIN, AN OPENENDED SLAVE CYLINDER, A SLAVE PISTON THEREIN, THE CYLINDERS BEING CONCENTRIC, THEIR OPEN ENDS BEING OPPOSED TO, IN CONTACT WITH, AND REGISTERING WITH EACH OTHER, A PISTON ROD INTERPOSED BETWEEN THE PISTONS AND MEANS FOR REMOVABLY LOCKING THE TWO CYLINDERS TOGETHER, A MAIN HYDRAULIC FLUID RESERVOIR IN UNOBSTRUCTED COMMUNICATION WITH THE MASTER CYLINDER, AN AUXILIARY PRESSURE CYLINDER IN UNOBSTRUCTED COMMUNICATION WITH THE RESERVOIR, A PLUNGER IN THE AUXILIARY CYLINDER, AND RELEASABLE MEANS FOR BIASING THE PLUNGER TO APPLY HYDRAULIC PRESSURE FROM THE AUXILIARY CYLINDER, THROUGH THE RESERVOIR AND THE MASTER CYLINDER TO THE BRAKE SYSTEM, INDEPENDENT OF OPERATION OF THE MASTER PLUNGER, MEANS FOR RELEASING THE CYLINDER LOCKING MEANS AND FOR THEREAFTER RELEASING THE AUXILIARY PLUNGER BIASING MEANS.
Claim 2
Dependent Claim
133 words
IN A HYDRAULIC AUTOMOTIVE BRAKE SYSTEM, AN OPENENDED MASTER CYLINDER, A MASTER PISTON THEREIN, AN OPENENDED SLAVE CYLINDER, A SLAVE PISTON THEREIN, THE CYLINDERS BEING CONCENTRIC, THEIR OPEN ENDS BEING OPPOSED TO, IN CONTACT WITH, AND REGISTERING WITH EACH OTHER, A PISTON ROD INTERPOSED BETWEEN THE PISTONS AND MEANS FOR REMOVABLY LOCKING THE TWO CYLINDERS TOGETHER, A MAIN HYDRAULIC FLUID RESERVOIR IN UNOBSTRUCTED COMMUNICATION WITH THE MASTER CYLINDER, AN AUXILIARY PRESSURE CYLINDER IN UNOBSTRUCTED COMMUNICATION WITH THE RESERVOIR, A PLUNGER IN THE AUXILIARY CYLINDER, AND RELEASABLE MEANS FOR BIASING THE PLUNGER TO APPLY HYDRAULIC PRESSURE FROM THE AUXILIARY CYLINDER, THROUGH THE RESERVOIR AND THE MASTER CYLINDER TO THE BRAKE SYSTEM, INDEPENDENT OF OPERATION OF THE MASTER PLUNGER, MEANS FOR RELEASING THE CYLINDER LOCKING MEANS AND FOR THEREAFTER RELEASING THE AUXILIARY PLUNGER BIASING MEANS.
References Cited (Backward Citations)
US2058063A
Cited
US2184042A
Cited
US2217827A
Cited
US2299932A
Cited
US2325846A
Cited
US2848074A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-16 | 1967-12-16 | 1968-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-16 | 1971-12-16 | 1972-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-16 | 1975-12-16 | 1976-06-16 | $7700.00 | Window Closed / Lapsed |