Patent US4945276A successfully refreshed from Google Patents.
US4945276A
Expired / Lapsed
US
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Transducer for arranging in a fluid, particularly for the measurement of the flow-velocity of a fluid in a pipe, by transmitting/receiving sonic pulses
Assignee: Equinor ASA
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Filing: 1988-04-20
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Granted: 1990-07-31
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Expires: 2008-04-20
Abstract
Abstract A transducer for arranging in a fluid particularly for the measurement of the flow velocity of a fluid in a pipe by transmitting/receiving sonic pulses, is designed as a cupshaped metal body (5), whose base (2) as membrane (3) is assigned an electrode (4) on its inside, which is sealed off against the environment i.e. against the fluid, and whose cup wall is designed with an annulus (6) filled with a powerful damping material (8), for example epoxy, rubber or epoxy mixed with metal particles.
Inventors
- 👤 Kanagasaba Mylvaganam
- 👤 Erling Hammer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:04
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/24; G01F; G01F1/00; G01F1/66; G01F1/662; G01N; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02836
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A transducer for measurement of flow velocity of a fluid by transmitting and receiving sonic pulses, comprising: a one-piece cup-shaped housing, said housing having a base portion at a closed end thereof and a cylindrical cup-wall portion, thereby forming a hollow central cylindrical chamber; a membrane forming a central portion of said base portion, said membrane terminating adjacent said cylindrical cup-wall portion; an electrode centrally disposed on an inner side of said membrane so that a first side of said electrode is connected to said membrane, while a second side of said electrode communicates with said central cylindrical chamber; means for defining an annular chamber within said cylindrical cup-wall portion; and means, filling said annular chamber, for damping vibration in the cup-shaped housing.
Claim 2
Dependent Claim
123 words
A transducer for measurement of flow velocity of a fluid by transmitting and receiving sonic pulses, comprising: a one-piece cup-shaped housing, said housing having a base portion at a closed end thereof and a cylindrical cup-wall portion, thereby forming a hollow central cylindrical chamber; a membrane forming a central portion of said base portion, said membrane terminating adjacent said cylindrical cup-wall portion; an electrode centrally disposed on an inner side of said membrane so that a first side of said electrode is connected to said membrane, while a second side of said electrode communicates with said central cylindrical chamber; means for defining an annular chamber within said cylindrical cup-wall portion; and means, filling said annular chamber, for damping vibration in the cup-shaped housing.
Claim 3
Dependent Claim
14 words
The transducer according to claim 1, wherein said cup-shaped housing is formed of metal.
Claim 4
Dependent Claim
29 words
The transducer according to claim 1, wherein said damping means is formed of a material selected from the group consisting of epoxy, rubber and epoxy mixed with rubber particles.
Claim 5
Dependent Claim
16 words
The transducer according to claim 3, wherein said annular chamber is open toward said base portion.
Claim 6
Dependent Claim
20 words
The transducer according to claim 3, wherein said annular chamber is open toward a top portion of said cup-shaped housing.
Claim 7
Dependent Claim
12 words
The transducer according to claim 3, wherein said cup-shaped housing comprises titanium.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |