Patent US3910101A successfully refreshed from Google Patents.
US3910101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices for measuring density
Assignee: Individual
•
Filing: 1973-05-29
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Granted: 1975-10-07
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Expires: 1993-05-29
Abstract
Abstract For density determination for flowing samples, a transducer is applied in accomplishing compensation for temperature-dependency by maintaining by the transducer continuous oscillation of the oscillatory mass and by thereby also providing a second periodic force 90* phase shifted with respect to the excitation force, to the extent proportional to the amplitude of this second force, whereby amplitude has been thereby made to depend on sampletemperature in order to compensate for the temperature of the sample and oscillator.
Inventors
- 👤 Otto Kratky
- 👤 Hans Leopold
- 👤 Hans Stabinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:40
CPC Classifications
G; G01; G01N; G01N9/00; G01N9/002
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
96 words
A device for measuring the density of a fluid by determining the resonant frequency of a mechanical oscillator which in use contains in its oscillatory mass a measuring sample of fluid, wherein a mechanical to electrical transducer influenced by the oscillatory mass is connected to an electrical to mechanical transducer acting on the oscillatory mass via an electronic circuit which comprises means to alter to a predetermined degree the phase and amplitude of the signal exciting the oscillatory mass for the purpose of compensating for predetermined temperature-change and the effect of the mass of the suspension.
Claim 2
Independent Claim
96 words
A device for measuring the density of a fluid by determining the resonant frequency of a mechanical oscillator which in use contains in its oscillatory mass a measuring sample of fluid, wherein a mechanical to electrical transducer influenced by the oscillatory mass is connected to an electrical to mechanical transducer acting on the oscillatory mass via an electronic circuit which comprises means to alter to a predetermined degree the phase and amplitude of the signal exciting the oscillatory mass for the purpose of compensating for predetermined temperature-change and the effect of the mass of the suspension.
Claim 3
Dependent Claim
13 words
A device according to claim 1 wherein said means comprises a temperature-dependent branch.
Claim 4
Dependent Claim
14 words
A device according to claim 2 wherein the temperature-dependent branch comprises a bridge circuit.
Claim 5
Dependent Claim
15 words
A device according to claim 3 wherein said means comprises a branch containing two integrators.
Claim 6
Dependent Claim
35 words
A device according to claim 1 wherein the mechanical to electrical transducer is formed by a transducer sensitive to the velocity of the oscillatory mass, and wherein said means comprises a branch containing a limiter.
Claim 7
Dependent Claim
22 words
A device according to claim 5 wherein the velocity sensitive transducer is a magneto-dynamic transducer or an electrostatic transducer with current loading.
Claim 8
Dependent Claim
13 words
A device according to claim 6 wherein said means comprises a temperature-dependent branch.
Claim 9
Dependent Claim
19 words
A device according to claim 7 wherein the temperature-dependent branch comprises a bridge circuit in series with an integrator.
Claim 10
Dependent Claim
15 words
A device according to claim 8 wherein said means comprises a branch containing three integrators.
Claim 11
Dependent Claim
25 words
A device according to claim 1 wherein said means contains a temperature-dependent branch including a variable resistor for adjusting the temperature coefficient to be compensated.
Claim 12
Dependent Claim
29 words
A device accordIng to claim 10 wherein said means contains a branch for compensating the mass of the suspension, said branch including a variable resistor for adjusting the compensation.
Claim 13
Independent Claim
40 words
A device according to 11 wherein said means comprises a plurality of branches and a summing amplifier to the input of which said branches are connected, the output of the summing amplifier being connected to the electrical to mechanical transducer.
Claim 14
Independent Claim
40 words
A device according to 11 wherein said means comprises a plurality of branches and a summing amplifier to the input of which said branches are connected, the output of the summing amplifier being connected to the electrical to mechanical transducer.
Claim 15
Independent Claim
93 words
A device for measuring the density of a fluid by determining the resonant frequency of a mechanical oscillator which in use contains in its oscillatory mass a measuring sample of the fluid, wherein a mechanical to electrical transducer influenced by the oscillatory mass is connected to an electrical to mechanical transducer acting on the oscillatory mass via an electronic circuit which comprises means to alter temperature dependently the phase and amplitude of the signal exciting the oscillatory mass for the purpose of compensating for the temperature coefficient of period of the filled oscillator.
Claim 16
Independent Claim
93 words
A device for measuring the density of a fluid by determining the resonant frequency of a mechanical oscillator which in use contains in its oscillatory mass a measuring sample of the fluid, wherein a mechanical to electrical transducer influenced by the oscillatory mass is connected to an electrical to mechanical transducer acting on the oscillatory mass via an electronic circuit which comprises means to alter temperature dependently the phase and amplitude of the signal exciting the oscillatory mass for the purpose of compensating for the temperature coefficient of period of the filled oscillator.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |