Patent US3589200A successfully refreshed from Google Patents.
US3589200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the density of liquids
Assignee: Alfa Laval AB
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Filing: 1968-09-17
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Granted: 1971-06-29
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Expires: 1988-09-17
Abstract
Abstract A closed space filled with a reference liquid is arranged within a container for the process liquid of which the density is to be measured, the confining walls of the closed space consisting at least partly of a flexible material adapted to transmit pressure between the two liquids; and means are provided for sensing at the same level the pressure of the process liquid and the pressure of the reference liquid, and for comparing the sensed pressures. The process liquid may be passed continuously through the container by way of inlet and outlet openings so arranged that any dynamic pressure variation has counteracting effects on the two sensed pressures, due to the flexible wall.
Inventors
- 👤 Vilgot Raymond Nilsson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:32
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/26
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
The combination according to claim 1, in which said wall means include a substantially vertical pipe closed at its lower end, and a horizontal membrane closing the upper end of the pipe and forming said flexible wall.
Claim 2
Dependent Claim
94 words
The combination according to claim 1, in which said container is closed and has inlet and outlet openings for the process liquid, said openings being so located and dimensioned relative to each other, and with respect to the position of said flexible wall and the position of said pressure sensing level, that a pressure change in the process liquid at said level in the container, caused by the flow of the process liquid through the container, will be as large as similarly caused pressure change transmitted through said flexible wall to the reference liquid.
Claim 3
Dependent Claim
70 words
The combination according to claim 3, in which said flexible wall and pressure sensing level are located at the upper and lower end portions, respectively, of the container, said openings including an inlet located between and at equal distances from said flexible wall and sensing level, the openings also including two outlets located above and below said flexible wall and sensing level, respectively, and at equal distances from said inlet.
Claim 4
Dependent Claim
57 words
The combination according to claim 3, in which said openings include an inlet and two outlets located above and below the level of said inlet, the combination comprising also first conduits connected to the respective outlets and a common outlet conduit to which said first conduits lead and which is located at said level of the inlet.
Claim 5
Dependent Claim
20 words
The combination according to claim 1, in which said pressure sensing and comparing means consist of a pressure difference converter.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |