Patent US2755161A successfully refreshed from Google Patents.
US3261231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor vehicle transmission mechanism
Assignee: Harry Ferguson Research Ltd
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Filing: 1962-08-21
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Granted: 1966-07-19
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Expires: 1982-08-21
Abstract
No abstract record available.
Inventors
- 👤 Hill Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:10
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/02; F16D48/0206; B; B60; B60K; B60K17/00; B60K17/34; B60K17/344; B60K17/346; B60K17/3462; F16H; F16H48/00; F16H48/06; F16H48/08; F16H48/12; F16H48/16; F16H48/20; F16H48/22; F16H48/30; F16H48/34; F16D2048/0227; F16D2048/0233; F16D2048/0257; F16D2048/0272; F16D2500/00; F16D2500/10; F16D2500/104; F16D2500/10406; F16D2500/10425; F16H2048/202; F16H2200/00; F16H2200/20; F16H2200/203; F16H2200/2071; F16H48/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A CONTROLLED DIFFERENTIAL GEAR MECHANISM IN A MOTOR VEHICLE TRANSMISSION MECHANISM OF THE TYPE STATED IN COMBINATION WITH CONTROL MEANS INCLUDING A HYDRAULIC CLUTCH DEVICE CONNECTED WITH COMPONENTS OF THE DIFFERENTIAL GEAR; A HYDRAULIC PUMP HAVING A DRIVING CONNECTION WITH A ROADWHEEL OF THE VEHICLE, CONDUIT MEANS CONNECTING THE PUMP AND HYDRAULIC DEVICE, A VALVE ASSEMBLY THROUGH WHICH LIQUID FROM THE PUMP IS SUPPLIED TO THE HYDRAULIC CLUTCH DEVICE AND IS EXHAUSTED THEREFROM, CONDUIT MEANS CONNECTING THE PUMP AND VALVE ASSEMBLY, ALTERNATIVELY, AND A MEMBER WHICH IS INCLUDED IN SAID DRIVING CONNECTION AND IS DISPLACEABLE BY THE REACTION TO THE PUMPING ACTION, SUCH DISPLACEMENT CAUSING OPENING OF SAID VALVE ASSEMBLY TO SUPPLY AND CLOSED TO EXHAUST, SAID MEMBER BEING RETURNABLE ON CESSATION OF THE FORWARD DRIVE FROM THE ROADWHEEL TO A POSITION CONNECTING EXHAUST TO THE HYDRAULIC CLUTCH DEVICE.
Claim 2
Dependent Claim
139 words
A CONTROLLED DIFFERENTIAL GEAR MECHANISM IN A MOTOR VEHICLE TRANSMISSION MECHANISM OF THE TYPE STATED IN COMBINATION WITH CONTROL MEANS INCLUDING A HYDRAULIC CLUTCH DEVICE CONNECTED WITH COMPONENTS OF THE DIFFERENTIAL GEAR; A HYDRAULIC PUMP HAVING A DRIVING CONNECTION WITH A ROADWHEEL OF THE VEHICLE, CONDUIT MEANS CONNECTING THE PUMP AND HYDRAULIC DEVICE, A VALVE ASSEMBLY THROUGH WHICH LIQUID FROM THE PUMP IS SUPPLIED TO THE HYDRAULIC CLUTCH DEVICE AND IS EXHAUSTED THEREFROM, CONDUIT MEANS CONNECTING THE PUMP AND VALVE ASSEMBLY, ALTERNATIVELY, AND A MEMBER WHICH IS INCLUDED IN SAID DRIVING CONNECTION AND IS DISPLACEABLE BY THE REACTION TO THE PUMPING ACTION, SUCH DISPLACEMENT CAUSING OPENING OF SAID VALVE ASSEMBLY TO SUPPLY AND CLOSED TO EXHAUST, SAID MEMBER BEING RETURNABLE ON CESSATION OF THE FORWARD DRIVE FROM THE ROADWHEEL TO A POSITION CONNECTING EXHAUST TO THE HYDRAULIC CLUTCH DEVICE.
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) | 1969-07-18 | 1970-01-17 | 1970-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-18 | 1974-01-17 | 1974-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-18 | 1978-01-17 | 1978-07-19 | $7700.00 | Window Closed / Lapsed |