Patent US4384394A successfully refreshed from Google Patents.
US4384394A
Expired / Lapsed
US
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Method of manufacturing a piezoelectric transducer device
Assignee: Thales SA
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Filing: 1981-05-13
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Granted: 1983-05-24
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Expires: 2001-05-13
Abstract
Abstract The invention relates to devices using transducer elements comprising a film of piezoelectric polymer arranged between electrodes. The transducer element in accordance with the present invention is in the form of a thermoformed protuberance. These devices are used for detecting and generating elastic compression waves, for infrared radiation, and for storing electrical energy.
Inventors
- 👤 Claire Lemonon
- 👤 Francois Micheron
- 👤 Pierre Wang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:08
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0688; H04; H04R; H04R17/00; H04R17/005; H04R23/00; H04R23/02; H10N30/08; H10N30/084; H10N30/20; H10N30/204; H10N30/2047; H10N30/2048; H10N30/30; H10N30/308; H10N30/40; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T29/00; Y10T29/42; Y10T29/43; Y10T29/435
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
79 words
A method of manufacturing a transducer device having piezoelectric properties comprising the steps of: thermoforming at least one protuberance in a polymer film in the absence of an electrical field to mechanically strain and stretch said film in its plane to produce structural anisotropy in the wall thereof; electrically biasing the strained wall by a field applied in a direction normal to said wall to produce piezoelectric properties; and placing electrodes along said strained wall to form a capacitor.
Claim 2
Independent Claim
79 words
A method of manufacturing a transducer device having piezoelectric properties comprising the steps of: thermoforming at least one protuberance in a polymer film in the absence of an electrical field to mechanically strain and stretch said film in its plane to produce structural anisotropy in the wall thereof; electrically biasing the strained wall by a field applied in a direction normal to said wall to produce piezoelectric properties; and placing electrodes along said strained wall to form a capacitor.
Claim 3
Dependent Claim
26 words
A process as claimed in claim 1, wherein thermoforming is carried out by creating a pressure difference between two fluid media separated by said polymer film.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 2, wherein at least one of said two fluid media is gaseous.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 3, wherein said pressure difference is produced by suction of one of said two fluids.
Claim 6
Dependent Claim
23 words
A process as claimed in claim 2, wherein said two fluid mediums are liquids heated to the softening temperature of said polymer film.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 1, wherein thermoforming is carried out by stamping by means of a stamp and a die.
Claim 8
Dependent Claim
26 words
A process as claimed in claim 1, wherein thermoforming comprises the formation of a primary protuberance and the formation from this primary protuberance of secondary protuberances.
Claim 9
Independent Claim
113 words
A method of manufacturing a transducer device having piezoelectric properties comprising the steps of: thermoforming at least one protuberance in a polymer film in the absence of an electrical field to mechanically strain and stretch said film in its plane to produce structural anisotropy in the wall thereof by heating two liquids separated by said film to the softening temperature of said film and creating a pressure difference between said liquids; electrically biasing the strained wall by a field applied in a direction normal to said wall to preoduce piezoelectric properties by rendering said liquids electrically conductive to act as liquid electrodes; and placing electrodes along said strained wall to form a capacitor.
Claim 10
Independent Claim
113 words
A method of manufacturing a transducer device having piezoelectric properties comprising the steps of: thermoforming at least one protuberance in a polymer film in the absence of an electrical field to mechanically strain and stretch said film in its plane to produce structural anisotropy in the wall thereof by heating two liquids separated by said film to the softening temperature of said film and creating a pressure difference between said liquids; electrically biasing the strained wall by a field applied in a direction normal to said wall to preoduce piezoelectric properties by rendering said liquids electrically conductive to act as liquid electrodes; and placing electrodes along said strained wall to form a capacitor.
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) | 1986-05-23 | 1986-11-22 | 1987-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-23 | 1990-11-22 | 1991-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-23 | 1994-11-22 | 1995-05-24 | $7700.00 | Window Closed / Lapsed |