US3729982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for accurate determination of absolute density of a fluid
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1971-09-10
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Granted: 1973-05-01
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Expires: 1991-09-10
Abstract
Abstract In a vacuum vessel, a pipe and a bar which have the same outside diameter and are made of the same material are disposed parallelly to each other, with the ends thereof fixedly fastened to the side walls of the vessel. Said pipe and bar are provided with vibrating means which cause the pipe and the bar to vibrate. The pipe is first vibrated when the pipe interior is devoid of matter. The inside diameter of the pipe is determined indirectly from the consequent frequencies of the pipe and the bar. The pipe is then filled with a fluid whose density is to be determined and it is thereafter vibrated. The absolute density of the fluid contained in the pipe is directly determined with high accuracy on the basis of the frequency of the pipe in the packed state and the former frequency of the pipe in the empty state.
Inventors
- 👤 O Senda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:26
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/02; G01N29/036; G01N29/22; G01N29/222; G01N9/00; G01N9/002; G01N2009/004; G01N2291/00; G01N2291/02; G01N2291/028; G01N2291/02818
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
An apparatus for accurate determination of the inside diameter of a pipe, comprising a vacuum vessel, a pipe and a bar disposed parallelly to each other inside the vacuum vessel with their ends fixedly fastened to the side walls thereof, the pipe and bar being made of the same material and being of identical outside diameter, a vibrating means adapted to vibrate the pipe and bar under the same condition, and a means for detecting the frequency of vibration caused in the pipe and the bar by the vibrating means, the inside diameter of the said pipe being determined from the frequency of the pipe and the frequency of the bar detected by the said detecting means.
Claim 2
Independent Claim
117 words
An apparatus for accurate determination of the inside diameter of a pipe, comprising a vacuum vessel, a pipe and a bar disposed parallelly to each other inside the vacuum vessel with their ends fixedly fastened to the side walls thereof, the pipe and bar being made of the same material and being of identical outside diameter, a vibrating means adapted to vibrate the pipe and bar under the same condition, and a means for detecting the frequency of vibration caused in the pipe and the bar by the vibrating means, the inside diameter of the said pipe being determined from the frequency of the pipe and the frequency of the bar detected by the said detecting means.
Claim 3
Independent Claim
139 words
An apparatus for accurate determination of the density of a fluid, comprising a vacuum vessel, a pipe and a bar disposed parallely to each other inside the vacuum vessel with their ends fixedly fastened to the side walls thereof, the pipe and bar being made of the same material and being of identical outside diameter, a vibrating means adapted to vibrate the pipe and bar under the same condition, and a means for detecting the frequency of vibration caused in the pipe and the bar by the vibrating means, the inside diameter of the pipe being determined from the frequency of the pipe and the frequency of the bar and, subsequently, the density of a fluid introduced into the pipe being determined from the inside diameter previously determined and the frequency of the said pipe filled with the fluid.
Claim 4
Independent Claim
139 words
An apparatus for accurate determination of the density of a fluid, comprising a vacuum vessel, a pipe and a bar disposed parallely to each other inside the vacuum vessel with their ends fixedly fastened to the side walls thereof, the pipe and bar being made of the same material and being of identical outside diameter, a vibrating means adapted to vibrate the pipe and bar under the same condition, and a means for detecting the frequency of vibration caused in the pipe and the bar by the vibrating means, the inside diameter of the pipe being determined from the frequency of the pipe and the frequency of the bar and, subsequently, the density of a fluid introduced into the pipe being determined from the inside diameter previously determined and the frequency of the said pipe filled with the fluid.
References Cited (Backward Citations)
GB1126450A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |