Patent US4419898A successfully refreshed from Google Patents.
US4419898A
Expired / Lapsed
US
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Method and apparatus for determining the mass flow of a fluid
Assignee: Sarasota Automation Ltd
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Filing: 1981-10-15
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Granted: 1983-12-13
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Expires: 2001-10-15
Abstract
Abstract A method of determining the mass flow of a fluid comprising measuring a plurality of parameters comprising the pressure P, the temperature T and the density ρ of the fluid, determining the specific gravity G of the fluid from the said parameters, and using the measured density ρ together with a further parameter which varies with the volumetric flow to evaluate the mass flow of the fluid only if the so-determined value of G is within a given range of values.
Inventors
- 👤 Klaus J. Zanker
- 👤 Gerald Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:54
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/76; G01F1/86; G01F1/90
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
A method of determining the mass flow of a fluid comprising measuring, at each of a plurality of different regions in the fluid, a plurality of parameters comprising the pressure P, the temperature T and the density ρ of the fluid, determining the specific gravity G of the fluid from said parameters, and using the measured density together with a further parameter which varies with the volumetric flow to evaluate the mass flow of the fluid only if the so-determined values of G at said regions are within a given range of values.
Claim 2
Independent Claim
93 words
A method of determining the mass flow of a fluid comprising measuring, at each of a plurality of different regions in the fluid, a plurality of parameters comprising the pressure P, the temperature T and the density ρ of the fluid, determining the specific gravity G of the fluid from said parameters, and using the measured density together with a further parameter which varies with the volumetric flow to evaluate the mass flow of the fluid only if the so-determined values of G at said regions are within a given range of values.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 in which the different regions are respectively in intercommunicating conduits all of which receive the same fluid.
Claim 4
Independent Claim
93 words
A method of determining the mass flow of a fluid comprising measuring, at two different times, a plurality of parameters comprising the pressure P, the temperature T and the density ρ of the fluid, determining the specific gravity G of the fluid from said plurality of parameters at each of said times, and using the measured density together with a further parameter which varies with the volumetric flow to evaluate the mass flow of the fluid only if the rate of change of G with time is within a given range of values.
Claim 5
Independent Claim
93 words
A method of determining the mass flow of a fluid comprising measuring, at two different times, a plurality of parameters comprising the pressure P, the temperature T and the density ρ of the fluid, determining the specific gravity G of the fluid from said plurality of parameters at each of said times, and using the measured density together with a further parameter which varies with the volumetric flow to evaluate the mass flow of the fluid only if the rate of change of G with time is within a given range of values.
Claim 6
Dependent Claim
112 words
Apparatus for determining the mass flow of a fluid comprising means for measuring, at each of a plurality of different regions in the fluid, a plurality of parameters comprising the pressure P, the temperature T, and the density ρ of the fluid; means for determining the specific gravity of the fluid from said parameters; means for producing a further parameter which varies with the volumetric flow of said fluid; and means to evaluate the mass flow of the fluid from the values of ρ and of said further parameter, the last-mentioned means being rendered operative only if the so-determined values of G at said regions are within a given range of values.
Claim 7
Dependent Claim
112 words
Apparatus for determining the mass flow of a fluid comprising means for measuring, at each of a plurality of different regions in the fluid, a plurality of parameters comprising the pressure P, the temperature T, and the density ρ of the fluid; means for determining the specific gravity of the fluid from said parameters; means for producing a further parameter which varies with the volumetric flow of said fluid; and means to evaluate the mass flow of the fluid from the values of ρ and of said further parameter, the last-mentioned means being rendered operative only if the so-determined values of G at said regions are within a given range of values.
Claim 8
Dependent Claim
110 words
Apparatus for determining the mass flow of a fluid comprising means for measuring, at two different times, a plurality of parameters comprising the pressure P, the temperature T, and the density ρ of the fluid; means for determining the specific gravity of the fluid from said parameters at each of said times; means for producing a further parameter which varies with the volumetric flow of said fluid; and means to evaluate the mass flow of the fluid from the values of ρ and of said further parameter, the last-mentioned means being rendered operative only if the rate of change of G with time is within a given range of values.
Claim 9
Dependent Claim
110 words
Apparatus for determining the mass flow of a fluid comprising means for measuring, at two different times, a plurality of parameters comprising the pressure P, the temperature T, and the density ρ of the fluid; means for determining the specific gravity of the fluid from said parameters at each of said times; means for producing a further parameter which varies with the volumetric flow of said fluid; and means to evaluate the mass flow of the fluid from the values of ρ and of said further parameter, the last-mentioned means being rendered operative only if the rate of change of G with time is within a given range of values.
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) | 1986-12-12 | 1987-06-13 | 1987-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-12 | 1991-06-13 | 1991-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-12 | 1995-06-13 | 1995-12-13 | $7700.00 | Window Closed / Lapsed |