Patent US3241458A successfully refreshed from Google Patents.
US3241458A
Expired / Lapsed
US
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Levelling control system
Assignee: INCANDESCENT Ltd
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Filing: 1963-11-12
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Granted: 1966-03-22
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Goldie Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:30
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/20; C; C21; C21D; C21D1/00; C21D1/62; C21D1/673
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN COMBINATION, APPARATUS COMPRISING A BEAM MEMBER WHICH CAN BE RAISED AND LOWERED, HYDRAULIC ACTUATOR MEANS FOR RAISING ONE END OF SAID BEAM MEMBER SUPPLIED WITH A VARIABLE FLOW OF HYDRAULIC PRESSURE FLUID, VALVE MEANS FOR VARYING SAID FLOW AND A REVERSIBLE ELECTRIC MOTOR FOR OPERATING SAID VALVE MEANS, AND OTHER HYDRAULIC ACTUATOR MEANS SUPPLIED WITH A CONSTANT FLOW OF HYDRAULIC PRESSURE FLUID, FOR RAISING THE OPPOSITE END OF SAID BEAM MEMBER; AN ELECTRICAL CONTROL SYSTEM FOR MAINTAINING SAID BEAM MEMBER, DURING RAISING THEREOF, AT A CONSTANT PREDETERMINED INCLINATION TO THE HORIZONTAL (WHICH MAY BE ZERO), SAID SYSTEM INCLUDING TWO VOLTAGE VARYING DEVICES WITH COMMON INPUT VOLTAGE AND EACH HAVING A MOVABLE OUTPUT VOLTAGE-ADJUSTING ELEMENT, MECHANICAL MEANS SO OPERATIVELY CONNECTING SAID ELEMENTS
Claim 2
Dependent Claim
122 words
IN COMBINATION, APPARATUS COMPRISING A BEAM MEMBER WHICH CAN BE RAISED AND LOWERED, HYDRAULIC ACTUATOR MEANS FOR RAISING ONE END OF SAID BEAM MEMBER SUPPLIED WITH A VARIABLE FLOW OF HYDRAULIC PRESSURE FLUID, VALVE MEANS FOR VARYING SAID FLOW AND A REVERSIBLE ELECTRIC MOTOR FOR OPERATING SAID VALVE MEANS, AND OTHER HYDRAULIC ACTUATOR MEANS SUPPLIED WITH A CONSTANT FLOW OF HYDRAULIC PRESSURE FLUID, FOR RAISING THE OPPOSITE END OF SAID BEAM MEMBER; AN ELECTRICAL CONTROL SYSTEM FOR MAINTAINING SAID BEAM MEMBER, DURING RAISING THEREOF, AT A CONSTANT PREDETERMINED INCLINATION TO THE HORIZONTAL (WHICH MAY BE ZERO), SAID SYSTEM INCLUDING TWO VOLTAGE VARYING DEVICES WITH COMMON INPUT VOLTAGE AND EACH HAVING A MOVABLE OUTPUT VOLTAGE-ADJUSTING ELEMENT, MECHANICAL MEANS SO OPERATIVELY CONNECTING SAID ELEMENTS
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) | 1969-03-21 | 1969-09-20 | 1970-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-21 | 1973-09-20 | 1974-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-21 | 1977-09-20 | 1978-03-22 | $7700.00 | Window Closed / Lapsed |