Patent US3354751A successfully refreshed from Google Patents.
US3354751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual generators for electrically operated gear transmissions
Assignee: ZF Friedrichshafen AG
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Filing: 1965-07-28
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Granted: 1967-11-28
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Expires: 1985-07-28
Abstract
No abstract record available.
Inventors
- 👤 Beig Willy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:00
CPC Classifications
F; F16; F16H; F16H61/00; F16H59/00; F16H59/36; F16H61/02; F16H61/0202; F16H2710/00; F16H2710/16; F16H2710/22; F16H2716/00; F16H2716/08; F16H61/12; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19437
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
IN A CONTROL SYSTEM FOR A MULTISPEED POWER TRANSMISSION HAVING AN INPUT SHAFT AND A DRIVEN SHAFT, A HYDRAULIC TORQUE CONVERTER AND A GEARING DEVICE INCLUDING CLUTCH AND BRAKE MEANS FOR ESTABLISHING A PLURALITY OF DELIVERY PATHS BETWEEN SAID INPUT SHAFT AND SAID DRIVEN SHAFT, A FLUID PRESSURE SOURCE, FLUID PRESSURE OPERATED SERVO MEANS FOR ENGAGING AND DISENGAGING SAID CLUTCH AND BRAKE MEANS, A SOURCE OF ELECTRIC POWER, SOLENOID OPERATED VALVE MEANS FOR SHIFTING SAID SERVO MEANS AND SELECTIVELY DISTRIBUTING SAID FLUID PRESSURE TO SAID SERVO MEANS AND AN AUTOMATIC CONTROL DEVICE FOR CONNECTING SAID SOURCE OF ELECTRIC POWER TO THE CIRCUIT OF CORRESPONDING SOLENOID OPERATED VALVE IN RESPONSE TO THE SPEED OF SAID DRIVEN SHAFT, A PAIR OF GENERATORS AS SAID SOURCE OF ELECTRIC POWER DRIVINGLY CONNECTED WITH THE DRIVEN SHAFT, SAID GENERATORS BEING CONNECTED IN PARALLEL AND EFFECTING A CURRENT THE STRENGTH OF WHICH IS SUFFICIENT FOR UPSHIFTING SAID TRANSMISSION TO HIGHER GEAR SPEEDS, EACH OF SAID GENERATORS HAVING A CURRENT STRENGTH SUFFICIENT TO MAINTAIN SAID TRANSMISSION IN A SELECTED GEAR SPEED AND SUFFICIENT FOR DOWNSHIFTING SAID TRANSMISSION IN LOWER GEAR SPEEDS.
Claim 2
Dependent Claim
184 words
IN A CONTROL SYSTEM FOR A MULTISPEED POWER TRANSMISSION HAVING AN INPUT SHAFT AND A DRIVEN SHAFT, A HYDRAULIC TORQUE CONVERTER AND A GEARING DEVICE INCLUDING CLUTCH AND BRAKE MEANS FOR ESTABLISHING A PLURALITY OF DELIVERY PATHS BETWEEN SAID INPUT SHAFT AND SAID DRIVEN SHAFT, A FLUID PRESSURE SOURCE, FLUID PRESSURE OPERATED SERVO MEANS FOR ENGAGING AND DISENGAGING SAID CLUTCH AND BRAKE MEANS, A SOURCE OF ELECTRIC POWER, SOLENOID OPERATED VALVE MEANS FOR SHIFTING SAID SERVO MEANS AND SELECTIVELY DISTRIBUTING SAID FLUID PRESSURE TO SAID SERVO MEANS AND AN AUTOMATIC CONTROL DEVICE FOR CONNECTING SAID SOURCE OF ELECTRIC POWER TO THE CIRCUIT OF CORRESPONDING SOLENOID OPERATED VALVE IN RESPONSE TO THE SPEED OF SAID DRIVEN SHAFT, A PAIR OF GENERATORS AS SAID SOURCE OF ELECTRIC POWER DRIVINGLY CONNECTED WITH THE DRIVEN SHAFT, SAID GENERATORS BEING CONNECTED IN PARALLEL AND EFFECTING A CURRENT THE STRENGTH OF WHICH IS SUFFICIENT FOR UPSHIFTING SAID TRANSMISSION TO HIGHER GEAR SPEEDS, EACH OF SAID GENERATORS HAVING A CURRENT STRENGTH SUFFICIENT TO MAINTAIN SAID TRANSMISSION IN A SELECTED GEAR SPEED AND SUFFICIENT FOR DOWNSHIFTING SAID TRANSMISSION IN LOWER GEAR SPEEDS.
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) | 1970-11-27 | 1971-05-29 | 1971-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-27 | 1975-05-29 | 1975-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-27 | 1979-05-29 | 1979-11-28 | $7700.00 | Window Closed / Lapsed |