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US2745970A
Expired / Lapsed
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Radioactivity detector
Assignee: Schlumberger Well Surveying Corp
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Filing: 1952-01-04
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Granted: 1956-05-15
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Expires: 1972-01-04
Abstract
No abstract record available.
Inventors
- 👤 John T Dewan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:30
CPC Classifications
G; G01; G01V; G01V5/00; G01V5/04; G01V5/08; G01V5/10; G01V5/101; H; H01; H01J; H01J47/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
A RADIOACTIVITY DETECTOR COMPRISING AN ANODE WIRE, A CYLINDRICAL ANNULAR CATHODE CONCENTRICALLY SURROUNDING SAID ANODE WIRE, AN ELECTRON-PERMEABLE ELECTRODE INTERPOSED BETWEEN SAID ANODE WIRE, AND SAID CATHODE, AN ENVELOPE ENCLOSING SAID ANODE WIRE, CATHODE AND PREMEABLE ELECTRODE IN AN IONIZABLE GAS, MEANS FOR MAINTAINING A POSITIVE POTENTIAL DIFFERENCE BETWEEN SAID ANODE WIRE AND SAID CATHODE AND A NEGATIVE POTENTIAL DIFFERENCE BETWEEN SAID ELECTRON-PERMEABLE ELECTRODE AND SAID CATHODE, AND MEANS FOR ESTABLISHING A MAGNETIC FIELD SUBSTANTIALLY COAXIAL WITH SAID ANODE WIRE.
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) | 1959-05-15 | 1959-11-14 | 1960-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-15 | 1963-11-14 | 1964-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-15 | 1967-11-14 | 1968-05-15 | $7700.00 | Window Closed / Lapsed |