Patent US3799816A successfully refreshed from Google Patents.
US3834239A
Expired / Lapsed
US
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Differential pressure transducer for liquid metals
Assignee: MSA Safety Inc
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Filing: 1970-06-15
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Granted: 1974-09-10
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Expires: 1990-06-15
Abstract
Abstract A differential pressure transducer for use with liquid metals has a chamber divided into two compartments by a moveable wall. An electromagnetic pump included in an inlet conduit to the low pressure compartment develops sufficient head to equalize the pressure in both compartments. The electrical energy required by the pump is a measure of differential pressure.
Inventors
- 👤 E King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:28
CPC Classifications
G; G01; G01L; G01L11/00; G01L11/004; G01L11/008; G01L9/00; G01L9/0033; G01L9/0036
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A differential pressure transducer for liquid metals comprising a chamber, partition means comprising a moveable wall dividing the chamber into a first high pressure compartment and a second low pressure compartment, the wall being moveable in response to a pressure differential between said compartments, a conduit connecting the second compartment with a liquid metal source and comprising an electromagnetic pump oriented to pump into the second compartment, a differential transformer within the chamber having a moveable core, motion transmitting means connecting said core to said moveable wall, means responsive to the transformer output to provide electrical energy to the electromagnetic pump sufficient to equalize the pressure in the first and second compartments, and means to measure the electrical energy used by the pump.
Claim 2
Dependent Claim
123 words
A differential pressure transducer for liquid metals comprising a chamber, partition means comprising a moveable wall dividing the chamber into a first high pressure compartment and a second low pressure compartment, the wall being moveable in response to a pressure differential between said compartments, a conduit connecting the second compartment with a liquid metal source and comprising an electromagnetic pump oriented to pump into the second compartment, a differential transformer within the chamber having a moveable core, motion transmitting means connecting said core to said moveable wall, means responsive to the transformer output to provide electrical energy to the electromagnetic pump sufficient to equalize the pressure in the first and second compartments, and means to measure the electrical energy used by the pump.
Claim 3
Dependent Claim
25 words
A differential pressure transducer according to claim 1 having a cylindrical chamber and partition including a bellows compressible in a direction axially of the chamber.
Claim 4
Dependent Claim
28 words
A differential pressure transducer according to claim 2 in which the transformer core is rigidly secured to said bellows and moves in a direction axially of the chamber.
Claim 5
Dependent Claim
17 words
A differential transducer in accordance with claim 1 in which the pump is a DC conductive pump.
Claim 6
Dependent Claim
16 words
A differential transducer in accordance with claim 4 in which the measuring means is an ammeter.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |