US3669509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Controller for a skid control system
Assignee: ZF Active Safety US Inc
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Filing: 1970-08-03
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Granted: 1972-06-13
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Expires: 1990-08-03
Abstract
Abstract A HYDRAULIC BRAKE CONTROLLER FOR A SKID CONTROL SYSTEM IN WHICH THE CONTROLLER USES HYDRAULIC AMPLIFICATION AND RESPONSE GENERALLY PROPORTIONALLY TO THE MAGNITUDE OF AN ERROR SIGNAL.
Inventors
- 👤 Malcolm D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:16
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |