US3398992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake control system for hydraulic brakes
Assignee: Ferro Manufacturing Corp
•
Filing: 1966-03-30
•
Granted: 1968-08-27
•
Expires: 1986-03-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph C Littmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:33
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/108; B60T13/00; B60T13/10; B60T13/66
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A BRAKE CONTROL SYSTEM FOR HYDRAULIC BRAKES ON A TRAILER CONNECTED TO A TOWING VEHICLE OR TRACTOR HAVING A HYDRAULIC BRAKING SYSTEM INDEPENDENT OF THE TRAILER BRAKING SYSTEM, SAID BRAKE CONTROL SYSTEM COMPRISING A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, A PRESSURE REGULATING VALVE CONTROLLING THE PRESSURE OF FLUID DELIVERED FROM SAID SOURCE, A SOLENOID CONNECTED TO SAID VALVE, A SOURCE OF ELECTRICAL CURRENT CONNECTED TO THE WINDING OF SAID SOLEONID, AND VARIABLE RESISTANCE MEANS RESPONSIVE TO VARIATIONS IN THE BRAKE FORCE APPLIED TO THE TRACTOR IN SERIES WITH SAID SOLENOID WINDING.
Claim 2
Dependent Claim
92 words
A BRAKE CONTROL SYSTEM FOR HYDRAULIC BRAKES ON A TRAILER CONNECTED TO A TOWING VEHICLE OR TRACTOR HAVING A HYDRAULIC BRAKING SYSTEM INDEPENDENT OF THE TRAILER BRAKING SYSTEM, SAID BRAKE CONTROL SYSTEM COMPRISING A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE, A PRESSURE REGULATING VALVE CONTROLLING THE PRESSURE OF FLUID DELIVERED FROM SAID SOURCE, A SOLENOID CONNECTED TO SAID VALVE, A SOURCE OF ELECTRICAL CURRENT CONNECTED TO THE WINDING OF SAID SOLEONID, AND VARIABLE RESISTANCE MEANS RESPONSIVE TO VARIATIONS IN THE BRAKE FORCE APPLIED TO THE TRACTOR IN SERIES WITH SAID SOLENOID WINDING.
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |