Patent US3562707A successfully refreshed from Google Patents.
US3562707A
Expired / Lapsed
US
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Direction indicator systems for tractor-trailer vehicles
Assignee: ZF International UK Ltd
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Filing: 1968-08-21
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Granted: 1971-02-09
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Expires: 1988-08-21
Abstract
Abstract A DIRECTION INDICATOR SYSTEM FOR A TRACTOR-TRAILER VEHICLE INCLUDES A SWITCH ON THE TRACTOR FOR ENERGISING THE TRACTOR LAMPS BY WAY OF A CIRCUIT INCLUDING FIRST AND SECOND FLASHER UNITS, THE FIRST FLASHER UNIT ONLY BEING OPERATIVE WHEN THE TRACTOR LAMPS ALONE ARE ENERGISED BECAUSE THE CURRENT FLOW THROUGH THE SECOND FLASHER UNIT IS INSUFFICIENT TO ENERGISE IT. WHEN THE TRAILER IS COUPLED THE FIRST FLASHER UNIT IS SHORT-CIRCUITED AND THE SECOND FLASHER UNIT ALONE OPERATES.
Inventors
- 👤 Eric Bernard Parkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:07
CPC Classifications
B; B60; B60Q; B60Q11/00; B60Q11/005; B60Q11/007
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |