US3083533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic system
Assignee: Doosan Bobcat North America Inc
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Filing: 1960-10-24
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Granted: 1963-04-02
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Expires: 1980-10-24
Abstract
No abstract record available.
Inventors
- 👤 Frank J Schenkelberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:40
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/02; B; B60; B60K; B60K17/00; B60K17/04; B60K17/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A DUAL SOURCE HYDRAULIC SYSTEM FOR A VEHICLE COMPRISING A RESERVOIR FOR FLUID, A PLURALITY OF ACCESSORY MOTORS, A HYDRAULIC STEERING MOTOR, AN ACCUMULATOR FOR CONTINUOUSLY SUPPLYING FLUID UNDER PRESSURE TO SAID STEERING MOTOR, A FIRST PUMP ADAPTED TO COMMUNICATE WITH SAID RESERVOIR, SAID ACCESSORY MOTORS AND SAID ACCUMULATOR, A SECOND PUMP ADAPTED TO COMMUNICATE WITH SAID RESERVOIR AND WITH SAID ACCUMULATOR, SAID SECOND PUMP NORMALLY MAINTAINING SAID ACCUMULATOR IN A CHARGED CONDITION, VALVE MEANS RESPONSIVE TO ACCUMULATOR PRESSURE AND ADAPTED TO ALTERNATIVELY DIRECT FLUID TO SAID ACCUMULATOR AND TO SAID RESERVOIR IN RESPONSE TO VARIATIONS IN ACCUMULATOR PRESSURE, AND PRESSURE RESPONSIVE CONTROL MEANS OPERATIVELY CONNECTED TO SAID ACCUMULATOR TO INITIATE OPERATION OF SAID FIRST PUMP TO CHARGE SAID ACCUMULATOR WHEN THE PRESSURE IN SAID ACCUMULATOR REACHES A PREDETERMINED LOW SETTING.
Claim 2
Dependent Claim
131 words
A DUAL SOURCE HYDRAULIC SYSTEM FOR A VEHICLE COMPRISING A RESERVOIR FOR FLUID, A PLURALITY OF ACCESSORY MOTORS, A HYDRAULIC STEERING MOTOR, AN ACCUMULATOR FOR CONTINUOUSLY SUPPLYING FLUID UNDER PRESSURE TO SAID STEERING MOTOR, A FIRST PUMP ADAPTED TO COMMUNICATE WITH SAID RESERVOIR, SAID ACCESSORY MOTORS AND SAID ACCUMULATOR, A SECOND PUMP ADAPTED TO COMMUNICATE WITH SAID RESERVOIR AND WITH SAID ACCUMULATOR, SAID SECOND PUMP NORMALLY MAINTAINING SAID ACCUMULATOR IN A CHARGED CONDITION, VALVE MEANS RESPONSIVE TO ACCUMULATOR PRESSURE AND ADAPTED TO ALTERNATIVELY DIRECT FLUID TO SAID ACCUMULATOR AND TO SAID RESERVOIR IN RESPONSE TO VARIATIONS IN ACCUMULATOR PRESSURE, AND PRESSURE RESPONSIVE CONTROL MEANS OPERATIVELY CONNECTED TO SAID ACCUMULATOR TO INITIATE OPERATION OF SAID FIRST PUMP TO CHARGE SAID ACCUMULATOR WHEN THE PRESSURE IN SAID ACCUMULATOR REACHES A PREDETERMINED LOW SETTING.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |