Patent US2741736A successfully refreshed from Google Patents.
US2741736A
Expired / Lapsed
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Method for inductive prospecting
Assignee: Canadian Airborne Geophysics Ltd
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Filing: 1954-08-31
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Granted: 1956-04-10
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Expires: 1974-08-31
Abstract
No abstract record available.
Inventors
- 👤 Puranen Maunu
- 👤 Kahma Aarno Assar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:32
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/15; G01V3/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF ELECTROMAGNETIC PROSPECTING WHICH COMPRISES TRANSMITTING FROM A TRANSMITTING COIL IN AN AIRCRAFT A PRIMARY ALTERNATING ELECTROMAGNETIC FIELD, THUS SETTING UP A SECONDARY ALTERNATING ELECTROMAGNETIC FIELD DUE TO CONDUCTIVE ORE BODIES AND OTHER CONDUCTIVE BODIES AND FORMATIONS AND ALSO SETTING UP A DISTURBING ALTERNATING ELECTROMAGNETIC FIELD DUE TO CONDUCTIVE MASSES OF THE AIRCRAFT NEAR THE TRANSMITTING COIL, ELIMINATING THE DETRIMENTAL EFFECT OF THE DISTURBING FIELD BY SETTING UP BY MEANS OF AN ADDITIONAL CONDUCTOR NEAR THE TRANSMITTING COIL AN ALTERNATING ELECTROMAGNETIC FIELD WHICH NULLIFIES ANY COMPONENT OF THE DISTURBING FIELD THAT IS OUT OF PHASE WITH THE PRIMARY FIELD, RECEIVING IN A RECEIVING COIL THE RESULTANT ELECTROMAGNETIC SIGNALS OF SAID FIELDS, AND MEASURING CHARACTERISTICS OF THE RECEIVED SIGNALS.
Claim 2
Independent Claim
120 words
THE METHOD OF ELECTROMAGNETIC PROSPECTING WHICH COMPRISES TRANSMITTING FROM A TRANSMITTING COIL IN AN AIRCRAFT A PRIMARY ALTERNATING ELECTROMAGNETIC FIELD, THUS SETTING UP A SECONDARY ALTERNATING ELECTROMAGNETIC FIELD DUE TO CONDUCTIVE ORE BODIES AND OTHER CONDUCTIVE BODIES AND FORMATIONS AND ALSO SETTING UP A DISTURBING ALTERNATING ELECTROMAGNETIC FIELD DUE TO CONDUCTIVE MASSES OF THE AIRCRAFT NEAR THE TRANSMITTING COIL, ELIMINATING THE DETRIMENTAL EFFECT OF THE DISTURBING FIELD BY SETTING UP BY MEANS OF AN ADDITIONAL CONDUCTOR NEAR THE TRANSMITTING COIL AN ALTERNATING ELECTROMAGNETIC FIELD WHICH NULLIFIES ANY COMPONENT OF THE DISTURBING FIELD THAT IS OUT OF PHASE WITH THE PRIMARY FIELD, RECEIVING IN A RECEIVING COIL THE RESULTANT ELECTROMAGNETIC SIGNALS OF SAID FIELDS, AND MEASURING CHARACTERISTICS OF THE RECEIVED SIGNALS.
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) | 1959-04-10 | 1959-10-10 | 1960-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-10 | 1963-10-10 | 1964-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-10 | 1967-10-10 | 1968-04-10 | $7700.00 | Window Closed / Lapsed |