Patent US1044930A successfully refreshed from Google Patents.
Patent US4737676A successfully refreshed from Google Patents.
US4737676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer with a flexible piezoelectric layer as a sensor element
Assignee: A V L GESELLSCHAFT fur VERBRENNUNGSKRAFTMASCHINEN und MESSTECHNIK MBH
•
Filing: 1986-12-17
•
Granted: 1988-04-12
•
Expires: 2006-12-17
Abstract
Abstract A transducer comprising a flexible piezoelectric layer as a sensor element for measuring mechanical quantities in hollow bodies, above all pressures in pipes, the opposite sides of this layer being bonded to electrically-conductive contact layers and being connectable via leads to a display and evaluation unit. In order to achieve a high temperature stability in such transducers and to make them suitable for use at temperatures exceeding 80° C., the piezoelectric layer is proposed to consist of wurtzite or sphalerite. One of the electrically-conductive contact layers can be of some heat-resistant, flexible supporting material, for instance flexible metal foil, such as Cu-Be foil, or a sheet of plastic, one or both of whose sides are metallized, and the other electrically-conductive contact layer can be a metal coating applied by evaporation.
Inventors
- 👤 Gunter Engel
- 👤 Peter W. Krempl
- 👤 Klaus-Christoph Harms
- 👤 Helmut List
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:00
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/30; H10N30/302
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A flexible transducer which can be attached to a hollow body to measure a mechanical condition thereof, said transducer comprising an elongated heat-resistant, flexible metal foil having a first surface and a second surface; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entire second surface of said heat- resistant, flexible metal foil, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate; said heat-resistant, flexible metal foil and said coating of an electrically-conducting material being connectable to electrical leads.
Claim 2
Dependent Claim
130 words
A flexible transducer which can be attached to a hollow body to measure a mechanical condition thereof, said transducer comprising an elongated heat-resistant, flexible metal foil having a first surface and a second surface; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entire second surface of said heat- resistant, flexible metal foil, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate; said heat-resistant, flexible metal foil and said coating of an electrically-conducting material being connectable to electrical leads.
Claim 3
Dependent Claim
17 words
A flexible transducer according to claim 1, wherein said heat-resistant, flexible metal foil is composed of Cu-Be.
Claim 4
Dependent Claim
17 words
A flexible transducer according to claim 1, wherein said coating of electrically-conducting material is made of metal.
Claim 5
Dependent Claim
122 words
A flexible transducer which can be attached to a hollow body to measure a mechanical condition thereof, said transducer comprising an elongated heat-resistant, flexible sheet of plastic having opposite sides, at least one of said opposite sides being metallized; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entirety of one of the metallized surfaces of said heat-resistant, flexible sheet of plastic, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate.
Claim 6
Dependent Claim
122 words
A flexible transducer which can be attached to a hollow body to measure a mechanical condition thereof, said transducer comprising an elongated heat-resistant, flexible sheet of plastic having opposite sides, at least one of said opposite sides being metallized; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entirety of one of the metallized surfaces of said heat-resistant, flexible sheet of plastic, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate.
Claim 7
Dependent Claim
17 words
A flexible transducer according to claim 4, wherein said coating of electrically-conducting material is made of metal.
Claim 8
Dependent Claim
133 words
The combination of a pipe and a flexible transducer partially wrapped therearound to measure a mechanical condition of said pipe, said flexible transducer comprising an elongated heat-resistant, flexible metal foil having a first surface and a second surface; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entire second surface of said heat-resistant, flexible metal foil, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate; said heat-resistant, flexible metal foil and said coating of an electrically-conductive material being connectable to electrical leads.
Claim 9
Dependent Claim
133 words
The combination of a pipe and a flexible transducer partially wrapped therearound to measure a mechanical condition of said pipe, said flexible transducer comprising an elongated heat-resistant, flexible metal foil having a first surface and a second surface; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entire second surface of said heat-resistant, flexible metal foil, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate; said heat-resistant, flexible metal foil and said coating of an electrically-conductive material being connectable to electrical leads.
Claim 10
Dependent Claim
126 words
The combination of a pipe and a flexible transducer partially wrapped therearound to measure a mechanical condition of said pipe, said flexible transducer comprising an elongated heat-resistant, flexible sheet of plastic having opposite sides, at least one of said opposite sides being metallized; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entirety of one of the metallized surfaces of said heat-resistant, flexible sheet of plastic, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate.
Claim 11
Dependent Claim
126 words
The combination of a pipe and a flexible transducer partially wrapped therearound to measure a mechanical condition of said pipe, said flexible transducer comprising an elongated heat-resistant, flexible sheet of plastic having opposite sides, at least one of said opposite sides being metallized; an elongated flexible piezoelectric substrate having a first surface and a second surface, the first surface of said flexible piezoelectric substrate contacting and covering the entirety of one of the metallized surfaces of said heat-resistant, flexible sheet of plastic, said flexible piezoelectric substrate being heat resistant up to at least 80° C. and made of a material selected from the group consisting of wurtzite and sphalerite; and an elongated coating of an electrically-conductive material on the second surface of said flexible, piezoelectric substrate.
References Cited (Backward Citations)
US3486046A
Cited
US4004409A
Cited
US4176524A
Cited
US4193010A
Cited
AT375466B
Cited
US4216403A
Cited
DE2832714A1
Cited
US4304126A
Cited
JPS58137319A
Cited
JPS5927699A
Cited
US4541284A
Cited
US4533907A
Cited
JPS6072277A
Cited
US4600855A
Cited
US4642508A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |