US3344679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission control system
Assignee: Doosan Bobcat North America Inc
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Filing: 1965-04-09
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Granted: 1967-10-03
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Expires: 1985-04-09
Abstract
No abstract record available.
Inventors
- 👤 Burton S Zeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:49
CPC Classifications
F; F16; F16H; F16H59/00; F16H59/02; F16H59/04; F16H59/045; F16H47/00; F16H47/06; F16H61/00; F16H61/02; F16H61/0262; F16H61/0274; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19386; Y10T74/19405; Y10T74/19414; Y10T74/19419; Y10T74/19423; Y10T74/19428; Y10T74/19433
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
FOR USE WITH A SOURCE OF PRESSURIZED FLUID AND A TRANSMISSION HAVING A PLURALITY OF FLUID ACTUATED CLUTCHES CONNECTIBLE TO THE SOURCE OF PRESSURIZED FLUID FOR ENGAGING THE VARIOUS GEAR TRAINS THEREIN, A CONTROL SYSTEM COMPRISING A SPEED RATIO CONTROL VALVE MOVABLE BETWEEN A FIRST POSITION IN WHICH A FIRST ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID AND A SECOND POSITION IN WHICH A SECOND ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID, FIRST FLUID ACTUATED MEANS CONNECTED TO SAID VALVE FOR MOVING SAID VALVE BETWEEN SAID POSITIONS, A RANGE CONTROL VALVE MOVABLE BETWEEN A LOW RANGE POSITION IN WHICH A THIRD ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID AND A HIGH RANGE POSITION IN WHICH A FOURTH ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID, SECOND FLUID ACTUATED MEANS CONNECTED TO SAID RANGE CONTROL VALVE
Claim 2
Dependent Claim
154 words
FOR USE WITH A SOURCE OF PRESSURIZED FLUID AND A TRANSMISSION HAVING A PLURALITY OF FLUID ACTUATED CLUTCHES CONNECTIBLE TO THE SOURCE OF PRESSURIZED FLUID FOR ENGAGING THE VARIOUS GEAR TRAINS THEREIN, A CONTROL SYSTEM COMPRISING A SPEED RATIO CONTROL VALVE MOVABLE BETWEEN A FIRST POSITION IN WHICH A FIRST ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID AND A SECOND POSITION IN WHICH A SECOND ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID, FIRST FLUID ACTUATED MEANS CONNECTED TO SAID VALVE FOR MOVING SAID VALVE BETWEEN SAID POSITIONS, A RANGE CONTROL VALVE MOVABLE BETWEEN A LOW RANGE POSITION IN WHICH A THIRD ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID AND A HIGH RANGE POSITION IN WHICH A FOURTH ONE OF THE CLUTCHES IS CONNECTED TO THE SOURCE OF PRESSURIZED FLUID, SECOND FLUID ACTUATED MEANS CONNECTED TO SAID RANGE CONTROL VALVE
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |