US3554034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gravimeter
Assignee: Sinclair Oil Corp
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Filing: 1968-08-27
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Granted: 1971-01-12
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Expires: 1988-08-27
Abstract
Abstract A SUPERCONDUCTIVE SPHERE IS LEVITATED BY A CURRENTCARRYING COIL. DISPLACEMENT OF THE SPHERE FROM ITS EQUILIBRIUM POSITION, CAUSED BY CHANGES IN GRAVITATIONAL FORCE, ARE OPTICALLY DETECTED, AND IN RESPONSE TO THE DETECTOR OUTPUT A CURRENT IS GENERATED IN ANOTHER COILED WIRE ENCIRCLING THE SPHERE. THE MAGNETIC FIELD CAUSED BY THIS CURRENT GENERATES A FORCE WHICH RETURNS THE SPHERE TO ITS EQUILIBRIUM POSITION. MEASUREMENT OF THE RESTORING CURRENT PERMITS DETERMINATION OF THE CHANGE IN GRAVITATIONAL FORCE.
Inventors
- 👤 Richard C La Force
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:11
CPC Classifications
G; G01; G01V; G01V7/00; G01V7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |