US4625172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for supplying AC current to an underwater cable
Assignee: KDDI Corp
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Filing: 1985-06-19
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Granted: 1986-11-25
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Expires: 2005-06-19
Abstract
Abstract A device for burying a submarine cable under water by easily and accurately directing the cable position and a method for guiding the same by utilizing the characteristics unique to submarine cables, by supplying an AC only to the portion of the cable between two arbitrary repeaters through a so-called transformer-coupling system to generate an AC magnetic field, and by detecting the magnetic field with a magnetic field detector.
Inventors
- 👤 Kazuomi Yamamura
- 👤 Hideo Ishihara
- 👤 Yoshinao Iwamoto
- 👤 Shizuo Suzuki
- 👤 Yuichi Sirasaki
- 👤 Kenichi Asakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:07
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/02; G05D1/0206; G01; G01V; G01V3/00; G01V3/02; G01V3/06; H; H02; H02G; H02G1/00; H02G1/06; H02G1/10; Y; Y02; Y02A; Y02A90/00; Y02A90/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
An apparatus for supplying an AC current signal to a cable under water, comprising: a buoyant water-tight non-metallic container; a battery, an oscillator, and a power amplifier arranged in said container; said battery being electrically connected to said oscillator to supply DC power thereto, said oscillator being electrically connected to said amplifier for supplying AC current thereto; an annulus of magnetic material placed around said cable so as to leave an annular space therebetween; an exciting winding placed around said annulus and electrically connected to said power amplifier for supplying said winding with an AC current and thereby induce an AC signal in the cable by electro-magnetic induction, and an electrically non-conducting annular diaphragm wall closing said annular space to prevent power loss by flow of water through said space.
Claim 2
Independent Claim
130 words
An apparatus for supplying an AC current signal to a cable under water, comprising: a buoyant water-tight non-metallic container; a battery, an oscillator, and a power amplifier arranged in said container; said battery being electrically connected to said oscillator to supply DC power thereto, said oscillator being electrically connected to said amplifier for supplying AC current thereto; an annulus of magnetic material placed around said cable so as to leave an annular space therebetween; an exciting winding placed around said annulus and electrically connected to said power amplifier for supplying said winding with an AC current and thereby induce an AC signal in the cable by electro-magnetic induction, and an electrically non-conducting annular diaphragm wall closing said annular space to prevent power loss by flow of water through said space.
References Cited (Backward Citations)
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US3314009A
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US3771049A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |