Patent US4655075A successfully refreshed from Google Patents.
US4655075A
Expired / Lapsed
US
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Vibrating tube densimeter
Assignee: DELAWARE A CORP OF DE, University of
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Filing: 1986-02-19
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Granted: 1987-04-07
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Expires: 2006-02-19
Abstract
Abstract A vibrating tube densimeter characterized by separate electrical conductors attached to and moving with the tube. By interaction with a constant magnetic field in which they move, and in cooperation with an electronic circuit outside the invention, one of the conductors vibrates the tube and the other senses the vibration. The novel design is simple and permits operation at high temperatures.
Inventors
- 👤 Henry J. Albert
- 👤 Robert H. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:59
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/002; G01N2009/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
In a vibrating tube densimeter for fluids comprising: a U-shaped tube adapted to contain test fluid; electrical means for vibrating the tube in a magnetic field; and electrical means for sensing the resonant frequency of the tube; the improvement wherein the means for vibrating the tube and the means for sensing the resonant frequency of the tube comprise separate bare wire electrical conductors, each conductor passing once through said magnetic field, the conductors being insulatively attached to and adapted to move with the vibrating tube, whereby to permit operation up to about 500° C.
Claim 2
Dependent Claim
94 words
In a vibrating tube densimeter for fluids comprising: a U-shaped tube adapted to contain test fluid; electrical means for vibrating the tube in a magnetic field; and electrical means for sensing the resonant frequency of the tube; the improvement wherein the means for vibrating the tube and the means for sensing the resonant frequency of the tube comprise separate bare wire electrical conductors, each conductor passing once through said magnetic field, the conductors being insulatively attached to and adapted to move with the vibrating tube, whereby to permit operation up to about 500° C.
References Cited (Backward Citations)
US3117440A
Cited
US3728893A
Cited
US4187721A
Cited
US4262523A
Cited
US4422338A
Cited
US4422338B1
Cited
US4491009A
Cited
US4524610A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |