US4535292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmitter for an electromagnetic survey system with improved power supply switching system
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1982-04-05
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Granted: 1985-08-13
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Expires: 2002-04-05
Abstract
Abstract A transmitter, to be used in an airborne or ground electromagnetic survey system for detecting conductive bodies in an area, said system being adapted to generate a frequency modulated signal and radiating it to the said area, the said transmitter being provided with a power supply means being adapted to be connected by switch means to at least two circuits, each circuit comprising a radiating means, said radiating means being adapted to be connected to the power supply means, in such a way that assembled radiation means are present, each circuit comprising a radiating means being connected by its own switch to the said power supply means.
Inventors
- 👤 Lukas Ensing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:19
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/15; G01V3/17
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
132 words
A geophysical large dipole moment transmitter for an airborne electromagnetic inductive survey system for emitting primary electromagnetic signals to the earth for the purpose of detecting conductive bodies at a large depth in an area by means of measuring secondary electromagnetic signals which are generated by eddy currents induced in the earth by the primary electromagnetic signals, said transmitter comprising: a unit comprising a plurality of assembled or stacked transmitting coils of large diameter for installation on an aircraft for radiating a primary electromagnetic signal to the area; a power supply means for said coils; a plurality of switches for connecting said power supply means to said coils; each of said coils connected through its own switch to said power supply means, and means for activating said switches of said coils simultaneously.
Claim 2
Dependent Claim
132 words
A geophysical large dipole moment transmitter for an airborne electromagnetic inductive survey system for emitting primary electromagnetic signals to the earth for the purpose of detecting conductive bodies at a large depth in an area by means of measuring secondary electromagnetic signals which are generated by eddy currents induced in the earth by the primary electromagnetic signals, said transmitter comprising: a unit comprising a plurality of assembled or stacked transmitting coils of large diameter for installation on an aircraft for radiating a primary electromagnetic signal to the area; a power supply means for said coils; a plurality of switches for connecting said power supply means to said coils; each of said coils connected through its own switch to said power supply means, and means for activating said switches of said coils simultaneously.
Claim 3
Dependent Claim
17 words
The transmitter as claimed in claim 1, wherein said plurality of assembled coils comprises two assembled coils.
Claim 4
Dependent Claim
26 words
The transmitter as claimed in claim 2, wherein said assembled coils are tapped coils, the tap of said coils being connected to said power supply means.
Claim 5
Dependent Claim
16 words
The transmitter as claimed in claim 2 or 3, wherein said assembled coils are multi-turn coils.
Claim 6
Dependent Claim
15 words
The transmitter as claimed in claim 4, in which said assembled coils are two-turn coils.
Claim 7
Dependent Claim
21 words
The transmitter as claimed in claim 1, further including a circuit between each said coil and its switch comprising a capacitor.
Claim 8
Dependent Claim
21 words
The transmitter as claimed in claim 1, further including a circuit between each said coil and switch comprising a relay switch.
Claim 9
Dependent Claim
26 words
The transmitter as claimed in claim 1, wherein said plurality of assembled coils comprises ten coils, each connected through its switch to said power supply means.
Claim 10
Dependent Claim
30 words
The transmitter as claimed in claim 1, wherein said power supply means is a tapped power supply, the tap of said power supply being connected to each of said coils.
Claim 11
Dependent Claim
13 words
The transmitter as claimed in claim 9, wherein said coils are one-turn coils.
References Cited (Backward Citations)
US2735980A
Cited
US2169685A
Cited
US2623924A
Cited
US2839751A
Cited
US2903642A
Cited
GB848428A
Cited
US2931973A
Cited
US3020471A
Cited
US3143689A
Cited
US3168694A
Cited
US3315155A
Cited
US3317744A
Cited
US3950695A
Cited
US4157579A
Cited
GB2054159A
Cited
GB2054158A
Cited
US4276484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |