US3638496A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure transducer
Assignee: MSA Safety Inc
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Filing: 1970-06-15
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Granted: 1972-02-01
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Expires: 1990-06-15
Abstract
Abstract A pressure transducer has a chamber partitioned into two compartments by a movable wall; one compartment is open to the fluid pressure to be measured; the other compartment is closed and filled with a liquid and a predetermined amount of gas. The movable wall assumes a position that equalizes the pressure in the two compartments and electrical means indicate the position of the movable wall.
Inventors
- 👤 Earle C King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:44
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0033; G01L9/0036
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A pressure transducer comprising a fixed-dimension chamber, a single movable partition means dividing the chamber into two compartments, the first compartment being in communication with the fluid pressure to be measured, the second compartment being closed and filled with a liquid and a predetermined mass of gas inert to and substantially insoluble in the liquid, said partition means being movable in response to a pressure differential on its opposite sides to change the volume of said gas and thereby equalize the pressure in the first and second chambers, an electrically active element, a motion-transmitting means connecting the active element to said partition means, and means generating an electrical signal dependent on the position of the active element.
Claim 2
Dependent Claim
117 words
A pressure transducer comprising a fixed-dimension chamber, a single movable partition means dividing the chamber into two compartments, the first compartment being in communication with the fluid pressure to be measured, the second compartment being closed and filled with a liquid and a predetermined mass of gas inert to and substantially insoluble in the liquid, said partition means being movable in response to a pressure differential on its opposite sides to change the volume of said gas and thereby equalize the pressure in the first and second chambers, an electrically active element, a motion-transmitting means connecting the active element to said partition means, and means generating an electrical signal dependent on the position of the active element.
Claim 3
Dependent Claim
20 words
A pressure transducer according to claim 1, in which the liquid is an alloy of at least two alkali metals.
Claim 4
Dependent Claim
71 words
A pressure transducer according to claim 2, the second compartment having in axial alignment a first, cylindrical portion and a second cylindrical portion of smaller diameter than the first portion, the partition means consisting of a bellows in axial alignment with and within the first portion, a differential transformer core, rigid means securing the transformer core to the bellows and supporting the transformer core in axial alignment within the second portion.
References Cited (Backward Citations)
US3068700A
Cited
US3492872A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |