US3569749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric accelerometer with an internal spherical bearing
Assignee: Individual
•
Filing: 1969-11-03
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Granted: 1971-03-09
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Expires: 1989-11-03
Abstract
Abstract A piezoelectric accelerometer having a measuring element consisting of superimposed discs of piezoelectric material and a convex pressure-transmitting spacer located between a seismic mass and a concave seat on a housing, a prestressing element abuts the seismic mass at one end, and is secured to the housing at its other end.
Inventors
- 👤 Rudolf Zeiringer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:20
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/09; G01P15/0907
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A piezoelectric accelerometer according to claim 1, wherein the said prestressing element is a tube spring surrounding the said seismic mass, the annular inner end of the said tube spring being attached to the said transducer housing, the bottom of the tube spring at the outer end of the tube spring adjoining the outer front surface of the said seismic mass.
Claim 2
Dependent Claim
29 words
A piezoelectric accelerometer according to claim 1, wherein the said bearing surface of the support and the said convex spherical surface of the pressure-transmitting spacer are of annular design.
Claim 3
Dependent Claim
28 words
A piezoelectric accelerometer according to claim 3, wherein the said pressure-transmitting spacer presents a cross section diminishing progressively in the direction of the said annular convex spherical surface.
Claim 4
Dependent Claim
39 words
A piezoelectric accelerometer according to claim 1, wherein the said pressure-transmitting spacer is made of a material having a substantially lesser coefficient of thermal expansion than the material of the said transducer housing and of the said prestressing element.
Claim 5
Dependent Claim
39 words
A piezoelectric accelerometer according to claim 1, comprising at least one disc of a nonpiezoelectric material, such as quartz heated to a temperature above the Curie point, the said disc being applied to one end of said measuring element.
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) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |