US3943753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state viscosimeter
Assignee: Honeywell Inc
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Filing: 1974-06-17
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Granted: 1976-03-16
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Expires: 1994-06-17
Abstract
Abstract A viscosimeter is provided using a piezoelectric transformer to provide vibratory energy thereby imparting shear waves to the surrounding fluid. An output signal provides a representation of the fluid viscosity.
Inventors
- 👤 Frank N. Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:18
CPC Classifications
G; G01; G01N; G01N11/00; G01N11/10; G01N11/16
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A viscosimeter for providing representation of viscosity of a fluid, said viscosimeter comprising: a piezoelectric voltage transformer, having electrical terminals thereon serving as input terminals and output terminals, said transformer having surfaces thereof placed in motion in directions in which they are capable of imparting shear waves to those portions of said fluid sufficiently near said surfaces; oscillator circuitry means for providing an oscillating electrical voltage at said input terminals; and output voltage sensing means which senses an oscillating output voltage signal provided between said output terminals to provide said representation, with oscillations in said output voltage signal occurring at frequencies where said output voltage signal has substantially a maximum amplitude.
Claim 2
Dependent Claim
111 words
A viscosimeter for providing representation of viscosity of a fluid, said viscosimeter comprising: a piezoelectric voltage transformer, having electrical terminals thereon serving as input terminals and output terminals, said transformer having surfaces thereof placed in motion in directions in which they are capable of imparting shear waves to those portions of said fluid sufficiently near said surfaces; oscillator circuitry means for providing an oscillating electrical voltage at said input terminals; and output voltage sensing means which senses an oscillating output voltage signal provided between said output terminals to provide said representation, with oscillations in said output voltage signal occurring at frequencies where said output voltage signal has substantially a maximum amplitude.
Claim 3
Dependent Claim
17 words
The system of claim 1 wherein said oscillator circuitry means includes a variable frequency electrical wave generator.
Claim 4
Dependent Claim
35 words
The system of claim 1 wherein said oscillator circuitry means includes an oscillator circuit which has said transformer operating as a functional element therein in setting said frequencies at which said oscillator circuitry means oscillates.
Claim 5
Dependent Claim
14 words
The system of claim 1 wherein said output voltage sensing means includes computation apparatus.
Claim 6
Dependent Claim
58 words
The system of claim 1 wherein any surfaces of said piezoelectric transformer placed in motion in directions in which they are capable of imparting longitudinal wave energy to said fluid have an area sufficiently small so that said longitudinal wave energy imparted to said fluid is so little that said output voltage signal is not influenced substantially thereby.
Claim 7
Dependent Claim
27 words
The system of claim 1 wherein a mount supporting said piezoelectric transformer is joined to said piezoelectric transformer at a node in said motion of said surfaces.
Claim 8
Dependent Claim
14 words
The system of claim 1 wherein said output voltage sensing means includes display means.
Claim 9
Dependent Claim
34 words
The system of claim 1 wherein said piezoelectric transformer is shaped as a rectangular bar and approximately half thereof, excluding surface portions joined to said input terminals, is submerged in said fluid in operation.
Claim 10
Dependent Claim
17 words
The system of claim 8 wherein said piezoelectric transformer is completely submerged in said fluid in operation.
Claim 11
Dependent Claim
15 words
The system of claim 8 wherein said half submerged has an electrically insulating layer thereon.
Claim 12
Dependent Claim
28 words
The system of claim 8 wherein said half puts so little longitudinal acoustic wave energy to said fluid that said output voltage signal is not influenced substantially thereby.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |