Patent US3177992A successfully refreshed from Google Patents.
US3177992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Clutch control system
Assignee: Doosan Bobcat North America Inc
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Filing: 1961-12-27
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Granted: 1965-04-13
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Expires: 1981-12-27
Abstract
No abstract record available.
Inventors
- 👤 Edgar H Ayers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:01
CPC Classifications
F; F16; F16D; F16D48/00; F16D48/06; F16D2500/00; F16D2500/10; F16D2500/102; F16D2500/1021; F16D2500/1022; F16D2500/11; F16D2500/1107; F16D2500/1112; F16D2500/30; F16D2500/306; F16D2500/3067; F16D2500/314; F16D2500/31406; F16D2500/31413; F16D2500/3144; F16D2500/50; F16D2500/502; F16D2500/50293; F16D2500/50296
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
IN A VEHICLE HAVING AN ENGINE, MEANS FOR VARYING THE ENGINE SPEED, DRIVE WHEELS AND A CLUTCH FOR CONNECTING AND DISCONNECTING THE ENGINE AND DRIVE WHEELS, A CLUTCH CONTROL SYSTEM COMPRISING MEANS FOR ENGAGING AND DISENGAGING THE CLUTCH INCLUDING A CLUTCH PEDAL AND A FIRST SOLENOID OPERABLE WHEN ENERGIZED TO DISENGAGE THE CLUTCH, A PAIR OF CONNECTIONS TO A SOURCE OF POWER, A CIRCUIT INCLUDING A FIRST NORMALLY OPEN SWITCH AND SAID FIRST SOLENOID CONNECTED IN SERIES BETWEEN ONE SAID CONNECTION AND THE OTHER SAID CONNECTION, SAID FIRST SWITCH CLOSING WHEN SAID CLUTCH PEDAL IS DEPRESSED, A SECOND NORMALLY OPEN SWITCH CONNECTED IN PARALLEL WITH SAID FIRST SWITCH, A SECOND SOLENOID AND A THIRD SWITCH CONNECTED IN SERIES BETWEEN SAID PAIR OF CONNECTIONS, SAID SECOND SOLENOID BEING OPERABLE WHEN ENERGIZED TO CLOSE SAID SECOND SWITCH, SAID THIRD SWITCH OPENING AND CLOSING IN RESPONSE TO ACTUATION OF THE SPEED VARYING MEANS, CLOSURE OF SAID THIRD SWITCH OCCURRING WHEN SAID VARYING MEANS CONDITIONS THE ENGINE TO RUN ABOVE A PREDETERMINED ENGINE SPEED, AND MEANS OPERATIVELY CONNECTED TO SAID SECOND SWITCH FOR DELAYING THE OPENING OF SAID SECOND SWITCH FOLLOWING THE OPENING OF SAID THIRD SWITCH.
Claim 2
Dependent Claim
193 words
IN A VEHICLE HAVING AN ENGINE, MEANS FOR VARYING THE ENGINE SPEED, DRIVE WHEELS AND A CLUTCH FOR CONNECTING AND DISCONNECTING THE ENGINE AND DRIVE WHEELS, A CLUTCH CONTROL SYSTEM COMPRISING MEANS FOR ENGAGING AND DISENGAGING THE CLUTCH INCLUDING A CLUTCH PEDAL AND A FIRST SOLENOID OPERABLE WHEN ENERGIZED TO DISENGAGE THE CLUTCH, A PAIR OF CONNECTIONS TO A SOURCE OF POWER, A CIRCUIT INCLUDING A FIRST NORMALLY OPEN SWITCH AND SAID FIRST SOLENOID CONNECTED IN SERIES BETWEEN ONE SAID CONNECTION AND THE OTHER SAID CONNECTION, SAID FIRST SWITCH CLOSING WHEN SAID CLUTCH PEDAL IS DEPRESSED, A SECOND NORMALLY OPEN SWITCH CONNECTED IN PARALLEL WITH SAID FIRST SWITCH, A SECOND SOLENOID AND A THIRD SWITCH CONNECTED IN SERIES BETWEEN SAID PAIR OF CONNECTIONS, SAID SECOND SOLENOID BEING OPERABLE WHEN ENERGIZED TO CLOSE SAID SECOND SWITCH, SAID THIRD SWITCH OPENING AND CLOSING IN RESPONSE TO ACTUATION OF THE SPEED VARYING MEANS, CLOSURE OF SAID THIRD SWITCH OCCURRING WHEN SAID VARYING MEANS CONDITIONS THE ENGINE TO RUN ABOVE A PREDETERMINED ENGINE SPEED, AND MEANS OPERATIVELY CONNECTED TO SAID SECOND SWITCH FOR DELAYING THE OPENING OF SAID SECOND SWITCH FOLLOWING THE OPENING OF SAID THIRD SWITCH.
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) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |