US4550610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonator pressure transducer
Assignee: QUARTZTRONICS Inc 1020 ATHERTON DRIVE BUILDING C STE 202 SALT LAKE CITY UTAH 84107 A UTAH CORP
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Filing: 1983-11-28
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Granted: 1985-11-05
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Expires: 2003-11-28
Abstract
Abstract A quartz resonator pressure transducer includes a generally disc-shaped resonator section, a housing surrounding the resonator section and joined to the perimeter thereof, with the walls of the housing extending in opposite directions generally normal to the plane of the resonator section. Selected portions of the sidewalls are made thinner than the remaining sidewall portions so that when the housing is immersed in a fluid, a non-uniform stress will be produced in the resonator section. The housing and resonator section are formed so that the frequency of vibration of the resonator section is substantially independent of temperature and relatively independent of temperature transients.
Inventors
- 👤 Errol P. Eernisse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:41
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0008; G01L9/0022
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
95 words
A resonator pressure transducer comprising: a generally disc-shaped resonator section; a housing surrounding the resonator section and joined to the perimeter thereof, said housing having sidewalls which extend generally normal to the plane of the resonator section, with selected portions of the sidewalls being thinner than the remaining portions of the sidewalls so that when the housing is immersed in a fluid, a non-uniform stress is produced in the resonator section; and means for causing said resonator section to vibrate, with the frequency of vibration varying with variation in pressure applied to the housing sidewalls.
Claim 2
Dependent Claim
95 words
A resonator pressure transducer comprising: a generally disc-shaped resonator section; a housing surrounding the resonator section and joined to the perimeter thereof, said housing having sidewalls which extend generally normal to the plane of the resonator section, with selected portions of the sidewalls being thinner than the remaining portions of the sidewalls so that when the housing is immersed in a fluid, a non-uniform stress is produced in the resonator section; and means for causing said resonator section to vibrate, with the frequency of vibration varying with variation in pressure applied to the housing sidewalls.
Claim 3
Dependent Claim
18 words
A transducer as in claim 1 wherein said resonator section is integral with the sidewalls of the housing.
Claim 4
Dependent Claim
27 words
A transducer as in claim 1 wherein said resonator section is formed of crystalline quartz so that the frequency of vibration is substantially independent of temperature transients.
Claim 5
Dependent Claim
13 words
A transducer as in claim 3 wherein said resonator section is SC-cut quartz.
Claim 6
Dependent Claim
16 words
A transducer as in claim 4 wherein the thinner sidewall portions are diametrically opposite one another.
Claim 7
Dependent Claim
27 words
A transducer as in claim 1 wherein said resonator section is formed of crystalline quartz so that the frequency of vibration is substantially independent of temperature variations.
Claim 8
Dependent Claim
13 words
A transducer as in claim 6 wherein said resonator section is AT-cut quartz.
Claim 9
Dependent Claim
13 words
A transducer as in claim 6 wherein said resonator section is BT-cut quartz.
Claim 10
Dependent Claim
30 words
A transducer as in claim 1 wherein said housing is generally cylindrical, with the diametrically opposite sidewall portions being formed with flats or chord cuts on the exterior surface thereof.
Claim 11
Dependent Claim
15 words
A transducer as in claim 1 wherein the cross-section of the housing is generally rectangular.
Claim 12
Dependent Claim
15 words
A transducer as in claim 1 wherein the cross-section of the housing is generally elliptical.
Claim 13
Dependent Claim
17 words
A transducer as in claim 1 wherein the housing includes three generally equally-spaced apart thinner sidewall portions.
Claim 14
Dependent Claim
96 words
Pressure detection apparatus comprising: a generally disc-shaped quartz crystal resonator section adapted to vibrate in response to an oscillatory signal, with the frequency of vibration varying with variation in force applied at the perimeter of the resonator section; a housing having sidewalls joined to the perimeter of the resonator section to circumscribe the section and extend in opposite directions normal to the plane of the resonator section, wherein selected portions of the sidewalls are thinner than the remaining portions; and means for supplying an oscillatory signal to said resonator section to cause the section to vibrate.
Claim 15
Dependent Claim
96 words
Pressure detection apparatus comprising: a generally disc-shaped quartz crystal resonator section adapted to vibrate in response to an oscillatory signal, with the frequency of vibration varying with variation in force applied at the perimeter of the resonator section; a housing having sidewalls joined to the perimeter of the resonator section to circumscribe the section and extend in opposite directions normal to the plane of the resonator section, wherein selected portions of the sidewalls are thinner than the remaining portions; and means for supplying an oscillatory signal to said resonator section to cause the section to vibrate.
Claim 16
Dependent Claim
57 words
Apparatus as in claim 13 wherein said resonator section is fabricated from quartz so that the frequency of vibration is substantially independent of temperature transients, wherein the selected portions comprise two diametrically opposite sidewalls, and wherein the alignment of the diametrically opposite side walls is rotated from the X' axis of the quartz by an angle d.
Claim 17
Dependent Claim
21 words
Apparatus as in claim 13 wherein said housing is generally cylindrical with oppositely-facing flat sections formed coincident with the thinner walls.
Claim 18
Dependent Claim
28 words
Apparatus as in claim 13 wherein the cross-section of the housing is generally rectangular, with the long dimension sides of the cross-section being coincident with the thinner walls.
Claim 19
Dependent Claim
28 words
Apparatus as in claim 13 wherein the cross-section of the housing is generally elliptical, with the long dimension sides of the cross-section being coincident with the thinner walls.
Claim 20
Dependent Claim
17 words
Apparatus as in claim 13 wherein the resonator section is integral with the sidewalls of the housing.
Claim 21
Dependent Claim
93 words
A resonator pressure transducer comprising: a generally disc-shaped resonator section; a housing surrounding the resonator section and joined to the perimeter thereof, said housing having sidewalls which extend generally normal to the plane of the resonator, with at least one portion of the sidewalls being thinner than the remaining portions so that when the housing is immersed in a fluid, a non-uniform stress is produced in the resonator section; and means for causing said resonator section to vibrate, with the frequency of vibration varying with variation in pressure applied to the housing sidewalls.
Claim 22
Dependent Claim
93 words
A resonator pressure transducer comprising: a generally disc-shaped resonator section; a housing surrounding the resonator section and joined to the perimeter thereof, said housing having sidewalls which extend generally normal to the plane of the resonator, with at least one portion of the sidewalls being thinner than the remaining portions so that when the housing is immersed in a fluid, a non-uniform stress is produced in the resonator section; and means for causing said resonator section to vibrate, with the frequency of vibration varying with variation in pressure applied to the housing sidewalls.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |