Patent US3919300A successfully refreshed from Google Patents.
US3614891A
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Well surveying instrument and method
Assignee: Geco Prakla GmbH
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Filing: 1969-03-17
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Granted: 1971-10-26
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Expires: 1989-03-17
Abstract
Abstract A SURVEYING INSTRUMENT FOR INVESTIGATING THE CHARACTER OF AN UNDERGROUND CAVITY PENETRATED BY A BOREHOLE, INCLUDES AN ELONGATED INSTRUMENT HOUSING AND A LOWER SECTION CONTAINING MEANS TO GENERATE AND RECEIVE ENERGY, SUCH AS A SURVEYING TRANSCEIVER. THE LOWER SECTION IS PIVOTALLY AND ROTATABLY MOVABLE ABOUT THE LOWER END OF THE HOUSING ENABLING THE ENTIRE SURFACE OF THE CAVITY TO BE SURVEYED.
Inventors
- 👤 Ernst P Nolte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
G; G01; G01S; G01S15/00; G01S15/88; E; E21; E21B; E21B47/00; E21B47/003; G01S17/00; G01S17/88; G01S17/89
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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |