US3903731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for determining physical properties
Assignee: National Research Council Canada
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Filing: 1974-02-27
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Granted: 1975-09-09
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Expires: 1994-02-27
Abstract
Abstract An apparatus for determining the value or change in physical properties of a fluid, particularly viscosity, comprising a conduit that is vibrated longitudinally and wherein the relative movement of fluid in the conduit provides a measure of the physical property. According to the invention the conduit is in the form of an endless loop so that the fluid oscillations are confined to the loop, thereby providing an apparatus that is insensitive to conditions in the interconnecting conduits which conduct the fluid to the conduit loop for analysis. In the preferred embodiment, the loop comprises two independent loop sections, one section is vibrated while the vibrations are detected in the other. Two fluids can be compared by coupling two similar units that have common vibrating and detecting means.
Inventors
- 👤 Anthony Sieben
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10; G01N11/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
101 words
An apparatus for determining physical properties of a fluid comprising: a. a conduit defining an endless loop for containing the fluid; b. said conduit having flexible segments and means for supporting the conduit for longitudinal movement of at least one portion thereof; c. constant power vibration means for longitudinally vibrating one said portion of the conduit; d. vibration detecting means for detecting the vibration in said one or other portion of the conduit; and e. inlet means and outlet means communicating with the conduit, said inlet and outlet means being disposed to divide the loop into two substantially equal loop portions.
Claim 2
Independent Claim
101 words
An apparatus for determining physical properties of a fluid comprising: a. a conduit defining an endless loop for containing the fluid; b. said conduit having flexible segments and means for supporting the conduit for longitudinal movement of at least one portion thereof; c. constant power vibration means for longitudinally vibrating one said portion of the conduit; d. vibration detecting means for detecting the vibration in said one or other portion of the conduit; and e. inlet means and outlet means communicating with the conduit, said inlet and outlet means being disposed to divide the loop into two substantially equal loop portions.
Claim 3
Dependent Claim
8 words
The apparatus of claim 1 for measuring viscosity.
Claim 4
Independent Claim
101 words
An apparatus for determining physical properties of a fluid comprising: a. a conduit defining an endless loop for containing the fluid; b. said conduit having two loop sections, each section having flexible segments and means supporting the conduit for longitudinal movement of a portion of each section; c. vibration means for longitudinally vibrating said portion of one loop section; d. vibration detecting means for detecting the vibration in said portion of the other section; and e. inlet means communicating substantially with the mid point of one loop section and outlet means communicating with the mid point of the other loop section.
Claim 5
Independent Claim
101 words
An apparatus for determining physical properties of a fluid comprising: a. a conduit defining an endless loop for containing the fluid; b. said conduit having two loop sections, each section having flexible segments and means supporting the conduit for longitudinal movement of a portion of each section; c. vibration means for longitudinally vibrating said portion of one loop section; d. vibration detecting means for detecting the vibration in said portion of the other section; and e. inlet means communicating substantially with the mid point of one loop section and outlet means communicating with the mid point of the other loop section.
Claim 6
Dependent Claim
16 words
The apparatus of claim 3 wherein the first and second loop sections have substantially equal lengths.
Claim 7
Dependent Claim
71 words
The apparatus of claim 3 coupled with another similar apparatus for comparing two fluids, the coupled apparatus having a single common vibration detecting means and single common vibration means adapted to vibrate a portion of the loop section of one apparatus 180* out of phase relative to that of the other such that the vibration detecting means provides an indication of the difference in the physical properties of the two fluids.
Claim 8
Dependent Claim
23 words
The apparatus of claim 5 wherein the vibrating portions of one apparatus are superimposed on the corresponding vibrating portions of the other apparatus.
Claim 9
Dependent Claim
30 words
The apparatus of claim 3 wherein each loop section is shaped to define two loops superimposed on one another and wherein the mid point of the loop section is fixed.
Claim 10
Dependent Claim
35 words
The apparatus of claim 3 wherein each portion adapted for longitudinal movement is in the form of an arc and wherein the loop section is fixed at substantially the center of curvature of the arc.
Claim 11
Dependent Claim
24 words
The apparatus of claim 3 wherein each loop section defines a coil, each coil being adapted for torsional vibration about the central axis thereof.
References Cited (Backward Citations)
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US3385104A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |