Patent US2776865A successfully refreshed from Google Patents.
Patent US3424006A successfully refreshed from Google Patents.
US3424006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting gravimeter
Assignee: USA
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Filing: 1965-07-30
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Granted: 1969-01-28
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Expires: 1985-07-30
Abstract
No abstract record available.
Inventors
- 👤 Robert H Dicke
- 👤 Barry Block
- 👤 Joseph Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:31
CPC Classifications
G; G01; G01V; G01V7/00; G01V7/02; G01V7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
APPARATUS FOR MEASURING GRAVITATIONAL OR ACCELERATION FORCES COMPRISING, IN COMBINATION: A LOOP MADE OF A MATERIAL WHICH BECOMES SUPERCONDUCTING WHEN ITS TEMPERATURE IS BELOW A CRITICAL LEVEL, SAID LOOP BEING ORIENTATED SO THAT IT IS IN A HORIZONTAL PLANE AND ITS AXIS IS VERTICAL; A SENSING ELEMENT MADE OF A MATERIAL WHICH BECOMES SUPERCONDUCTING WHEN ITS TEMPERATURE IS BELOW A CRITICAL LEVEL; SAID LOOP AND SAID SENSING ELEMENT BEING COOLED TO A TEMPERATURE BELOW THEIR CRITICAL LEVELS WHEREBY BOTH SAID LOOP AND SAID SENSING ELEMENT ARE IN A SUPERCONDUCTING STATE; MEANS FOR ESTABLISHING A CIRCULATING CURRENT OF CONSTANT AMPLITUDE AROUND SAID LOOP WHEN SAID LOOP IS IN SAID SUPERCONDUCTING SATTE, WHEREBY A SUBSTANTIALLY CONSTANT MAGNETIC FIELD IS PRODUCED IN THE VICINITY OF SAID LOOP; SAID SENSING ELEMENT WHEN IN SAID SUPERCONDUCTING STATE ACTING AS A DIAMAGNET SO THAT, WHEN DISPOSED WITHIN THE MAGNETIC FIELD PRODUCED BY SAID LOOP, SAID SENSING ELEMENT REMAINS SUSPENDED AT AN INITIAL REFERENCE POSITION; AND MEANS FOR DETECTING SUBSEQUENT CHANGES IN THE POSITION OF SAID SENSING ELEMENT THEREAFTER BROUGHT ABOUT BY ACCELERATION OR GRAVITATIONAL FORCES ACTING ON IT.
Claim 2
Dependent Claim
182 words
APPARATUS FOR MEASURING GRAVITATIONAL OR ACCELERATION FORCES COMPRISING, IN COMBINATION: A LOOP MADE OF A MATERIAL WHICH BECOMES SUPERCONDUCTING WHEN ITS TEMPERATURE IS BELOW A CRITICAL LEVEL, SAID LOOP BEING ORIENTATED SO THAT IT IS IN A HORIZONTAL PLANE AND ITS AXIS IS VERTICAL; A SENSING ELEMENT MADE OF A MATERIAL WHICH BECOMES SUPERCONDUCTING WHEN ITS TEMPERATURE IS BELOW A CRITICAL LEVEL; SAID LOOP AND SAID SENSING ELEMENT BEING COOLED TO A TEMPERATURE BELOW THEIR CRITICAL LEVELS WHEREBY BOTH SAID LOOP AND SAID SENSING ELEMENT ARE IN A SUPERCONDUCTING STATE; MEANS FOR ESTABLISHING A CIRCULATING CURRENT OF CONSTANT AMPLITUDE AROUND SAID LOOP WHEN SAID LOOP IS IN SAID SUPERCONDUCTING SATTE, WHEREBY A SUBSTANTIALLY CONSTANT MAGNETIC FIELD IS PRODUCED IN THE VICINITY OF SAID LOOP; SAID SENSING ELEMENT WHEN IN SAID SUPERCONDUCTING STATE ACTING AS A DIAMAGNET SO THAT, WHEN DISPOSED WITHIN THE MAGNETIC FIELD PRODUCED BY SAID LOOP, SAID SENSING ELEMENT REMAINS SUSPENDED AT AN INITIAL REFERENCE POSITION; AND MEANS FOR DETECTING SUBSEQUENT CHANGES IN THE POSITION OF SAID SENSING ELEMENT THEREAFTER BROUGHT ABOUT BY ACCELERATION OR GRAVITATIONAL FORCES ACTING ON IT.
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) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |