USH387H
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wavelength filter for marine seismic cables
Assignee: Shell USA Inc
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Filing: 1981-12-22
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Granted: 1987-12-01
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Expires: 2001-12-22
Abstract
Abstract A marine seismic cable comprising a core; a housing coupled to the core and having a cavity adapted for holding a hydrophone, the cavity being located on a first side of the housing; elastic material positioned in the cavity and extending beyond the boundary of the cavity, a hydrophone positioned in the elastic material in the cavity; and a rigid plate positioned adjacent to the elastic material.
Inventors
- 👤 Vitold R. Kruka
- 👤 Edward R. Cadena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:12
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; G10K11/04; G01; G01V; G01V1/00; G01V1/16; G01V1/20; G01V1/201
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
81 words
A marine seismic cable comprising: a core; a housing coupled to said core and having a cavity adapted for holding a hydrophone, said cavity being located on a first side of said housing; elastic material positioned in said cavity and extending beyond the boundary of said cavity; a hydrophone positioned in said elastic material in said cavity; and a wavelength filter positioned adjacent said elastic material to attenuate flow noise signals having shortwave lengths relative to the wavelengths of seismic signals.
Claim 2
Dependent Claim
81 words
A marine seismic cable comprising: a core; a housing coupled to said core and having a cavity adapted for holding a hydrophone, said cavity being located on a first side of said housing; elastic material positioned in said cavity and extending beyond the boundary of said cavity; a hydrophone positioned in said elastic material in said cavity; and a wavelength filter positioned adjacent said elastic material to attenuate flow noise signals having shortwave lengths relative to the wavelengths of seismic signals.
Claim 3
Dependent Claim
43 words
A marine seismic cable as recited in claim 1, wherein said elastic material extending beyond the boundary of said cavity comprises a layer of elastic material that is located adjacent to said housing and that prevents said wavelength filter from contacting said housing.
Claim 4
Dependent Claim
49 words
A marine seismic cable as recited in claim 2, wherein the area of the surface of said wavelength filter that is positioned adjacent to said elastic material is at least as large as the area of the opening of said cavity located on said first side of said housing.
Claim 5
Dependent Claim
18 words
A marine seismic cable as recited in claim 3, wherein said housing and said wavelength filter are curved.
Claim 6
Dependent Claim
25 words
A marine seismic cable as recited in claim 4, wherein said elastic material has a sonic velocity substantially equal to the sonic velocity of seawater.
Claim 7
Dependent Claim
66 words
A marine seismic cable as recited in claim 5, wherein said housing has a notch located on said first side around said cavity, said notch being sized so that said elastic material that extends beyond the boundary of said cavity together with said wavelength filter are positioned in said notch with a surface of said wavelength filter being coplanar with said first side of said housing.
Claim 8
Dependent Claim
17 words
A marine seismic cable as recited in claim 6, wherein said wavelength filter comprises a steel plate.
Claim 9
Dependent Claim
37 words
A marine seismic cable as recited in claim 2, wherein said wavelength filter has a predetermined thickness such that said filter attenuates pressure waves that are incident thereon and have wavelengths that are less than 1.35 feet.
Claim 10
Dependent Claim
37 words
A marine seismic cable as recited in claim 2, wherein said wavelength filter has a predetermined thickness such that said filter attenuates pressure waves that are incident thereon and have wavelengths that are less than 2.7 feet.
Claim 11
Dependent Claim
70 words
A marine seismic cable as recited in claim 3 or 4, wherein said housing and said wavelength filter are curved, said elastic material has a sonic velocity substantially equal to the sonic velocity of seawater, and the area of the surface of said filter that is adjacent to said elastic material is larger than the area of the opening of said cavity located on said first side of said housing.
Claim 12
Dependent Claim
65 words
A marine seismic cable as recited in claim 10, wherein said housing has a notch located on said first side around said cavity, said notch being sized so that said elastic material that extends beyond the boundary of said cavity together with said wavelength filter are positioned in said notch with a surface of said filter being coplanar with said first side of said housing.
Claim 13
Dependent Claim
17 words
A marine seismic cable as recited in claim 11, wherein said wavelength filter comprises a steel plate.
Claim 14
Dependent Claim
62 words
A hydrophone assembly for use in a marine cable, comprising: a housing having a cavity therein for containing moldable material and mountable in said cable; an acoustic energy transducer located in said moldable material; and means for substantially attenuating flow noise disposed between said transducer and the outer surface of said cable and for transmitting substantially unattenuated seismic signals to said transducer.
Claim 15
Dependent Claim
62 words
A hydrophone assembly for use in a marine cable, comprising: a housing having a cavity therein for containing moldable material and mountable in said cable; an acoustic energy transducer located in said moldable material; and means for substantially attenuating flow noise disposed between said transducer and the outer surface of said cable and for transmitting substantially unattenuated seismic signals to said transducer.
Claim 16
Independent Claim
49 words
A method for reducing flow noise in a marine cable having at least one hydrophone therein, comprising: attenuating short wavelength signals from said flow noise between the surface of said cable and said hydrophone and transmitting long wavelength seismic signals from the surface of said cable to said hydrophone.
Claim 17
Independent Claim
49 words
A method for reducing flow noise in a marine cable having at least one hydrophone therein, comprising: attenuating short wavelength signals from said flow noise between the surface of said cable and said hydrophone and transmitting long wavelength seismic signals from the surface of said cable to said hydrophone.
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) | 1990-11-30 | 1991-06-01 | 1991-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-30 | 1995-06-01 | 1995-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-30 | 1999-06-01 | 1999-12-01 | $7700.00 | Window Closed / Lapsed |