Patent US3881350A successfully refreshed from Google Patents.
US3881350A
Expired / Lapsed
US
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Electromagnetic sensor for measuring velocity of fluids under high pressure
Assignee: Ben SA
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Filing: 1972-06-15
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Granted: 1975-05-06
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Expires: 1992-06-15
Abstract
Abstract An electromagnetic sensor for measuring velocity of fluids under high pressure including a housing formed of a tubular piston member slidably engaging a tubular cylinder member and an electrical sensing device disposed within the cylinder member and having electrodes extending through a thin insulating wall sealing an end of the cylinder member. High pressure external of the housing of a fluid being sensed is transmitted by the piston member to the insulating wall through a chamber formed in the cylinder member filled with an incompressible insulating fluid such that the pressure differential across the insulating wall is reduced to a minimum to avoid deflection thereof.
Inventors
- 👤 Jacques Andre Nosley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:32
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/08; G01F; G01F1/00; G01F1/56; G01F1/58; G01F1/584; G01P13/00; G01P13/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
An electromagnetic sensor for measuring velocity of fluids under high pressure comprising first hollow means having a closed end and an open end; electromagnetic means disposed in said first hollow means adjacent said closed end and adapted to establish a magnetic field through a portion of a fluid to be measured; electrode means disposed in said closed end of said first hollow means to serve variations in the magnetic field; electrical conductor means connected with said electromagnetic means and said electrode means; and second hollow means having a first end slidably engaging said open end of said first hollow means with a fluid-tight seal and a second end, said electrical conductor means extending through said first and second hollow means and exiting said electromagnetic sensor through said second end of said second hollow means, said first and second hollow means sliding relative to each other with a piston effect to balance the internal pressure within said first and second hollow means with the pressure of the fluid external of said first and second hollow means.
Claim 2
Dependent Claim
175 words
An electromagnetic sensor for measuring velocity of fluids under high pressure comprising first hollow means having a closed end and an open end; electromagnetic means disposed in said first hollow means adjacent said closed end and adapted to establish a magnetic field through a portion of a fluid to be measured; electrode means disposed in said closed end of said first hollow means to serve variations in the magnetic field; electrical conductor means connected with said electromagnetic means and said electrode means; and second hollow means having a first end slidably engaging said open end of said first hollow means with a fluid-tight seal and a second end, said electrical conductor means extending through said first and second hollow means and exiting said electromagnetic sensor through said second end of said second hollow means, said first and second hollow means sliding relative to each other with a piston effect to balance the internal pressure within said first and second hollow means with the pressure of the fluid external of said first and second hollow means.
Claim 3
Dependent Claim
33 words
The electromagnetic sensor as recited in claim 1 wherein said first hollow means includes a tubular cylinder member and said second hollow means includes a tubular piston member slidable within said cylinder member.
Claim 4
Dependent Claim
37 words
The electromagnetic sensor as recited in claim 2 wherein said cylinder member has a chamber defined therein and said piston member has a sealed end extending within said cylinder member to define a wall of said chamber.
Claim 5
Dependent Claim
18 words
The electromagnetic sensor as recited in claim 3 wherein said chamber is filled with an incompressible insulating fluid.
Claim 6
Dependent Claim
42 words
The electromagNetic sensor as recited in claim 4 wherein said closed end of said cylinder member is a thin insulating wall and said electrode means includes at least one pair of electrodes extending through said thin insulating wall in sealed relation thereto.
Claim 7
Dependent Claim
38 words
The electromagnetic sensor as recited in claim 5 wherein said sealed end of said piston member includes a plug sealably engaging the inner surface of said piston member, said plug providing electrical connections for said electrical conductor means.
Claim 8
Dependent Claim
23 words
The electromagnetic sensor as recited in claim 6 wherein said second end of said piston member is sealed by a high pressure base.
Claim 9
Dependent Claim
38 words
The electromagnetic sensor as recited in claim 7 wherein said piston member has a compartment formed therein defined at one end by said plug, said compartment in said piston member being filled with an incompressible solid insulating material.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |