Patent US3239804A successfully refreshed from Google Patents.
US3239804A
Expired / Lapsed
US
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Seismometer
Assignee: Shell USA Inc
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Filing: 1962-08-10
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Granted: 1966-03-08
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Expires: 1982-08-10
Abstract
No abstract record available.
Inventors
- 👤 Petrus T Elskamp
- 👤 Johan G Hagedoorn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:55
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/18; G01V1/181
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A SEISMOMETER COMPRISING: A CASING; A PERMANENT MAGNET, SAID MAGNET BEING MOUNTED WITHIN SAID CASING, A COIL BODY HAVING AT LEAST ONE COIL WOUND THEREON, SAID COIL BODY IN ADDITION HAVING AN ANNULAR GROOVE FORMED NEAR ONE END THEREOF, SAID COIL BODY BEING DISPOSED IN SAID CASING; A FLAT DISC-SHAPED LEAF SPRING, THE CENTER PORTION OF SAID SPRING BEING FIXED TO SAID CASING AND THE OUTER PERIPHERY OF SAID SPRING BEING RETAINED IN SAID ANNULAR GROOVE; THE OUTER PERIPHERY OF SAID SPRING IN ADDITION BEING PROVIDED WITH A SMALL LUG, SAID LUG BEING RETAINED IN A RADIAL SLOT FORMED IN SAID COIL BODY.
Claim 2
Dependent Claim
103 words
A SEISMOMETER COMPRISING: A CASING; A PERMANENT MAGNET, SAID MAGNET BEING MOUNTED WITHIN SAID CASING, A COIL BODY HAVING AT LEAST ONE COIL WOUND THEREON, SAID COIL BODY IN ADDITION HAVING AN ANNULAR GROOVE FORMED NEAR ONE END THEREOF, SAID COIL BODY BEING DISPOSED IN SAID CASING; A FLAT DISC-SHAPED LEAF SPRING, THE CENTER PORTION OF SAID SPRING BEING FIXED TO SAID CASING AND THE OUTER PERIPHERY OF SAID SPRING BEING RETAINED IN SAID ANNULAR GROOVE; THE OUTER PERIPHERY OF SAID SPRING IN ADDITION BEING PROVIDED WITH A SMALL LUG, SAID LUG BEING RETAINED IN A RADIAL SLOT FORMED IN SAID COIL BODY.
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) | 1969-03-07 | 1969-09-06 | 1970-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-07 | 1973-09-06 | 1974-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-07 | 1977-09-06 | 1978-03-08 | $7700.00 | Window Closed / Lapsed |