US3912830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a piezoelectric or pyroelectric element
Assignee: Kureha Corp
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Filing: 1974-01-18
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Granted: 1975-10-14
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Expires: 1994-01-18
Abstract
Abstract A piezoelectric and/or pyroelectric element having improved durability is composed of a piezoelectric or pyroelectric polymer film such as a polyvinylidene fluoride film, an under coating of a thermoplastic or thermosetting resin having negligible piezoelectricity or pyroelectricity applied on the surface of a polar fluorinated polymer film, and metal electrodes vacuumdeposited on the surface of the under coating. The piezoelectric or pyroelectric element is produced by preparing the aboveindicated structure using a polar fluorinated polymer film which has not yet been provided with piezoelectricity or pyroelectricity and conducting the polarization of a polar fluorinated polymer film using the metal electrodes as the polarization electrodes.
Inventors
- 👤 Naohiro Murayama
- 👤 Takao Oikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; Y; Y10; Y10S; Y10S310/00; Y10S310/80; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
102 words
A METHOD FOR PRODUCING A PIEZOELECTRIC OR PYROELECTRIC ELEMENT WHICH COMPRISES: A. COATING THE SURFACE OF A POLAR FLUORINATED POLYMER FILM CAPABLE OF BEING PROVIDED WITH PIEZOELECTRICITY AND PYROELECTRICITY BY A POLARIZATION TREATMENT WITH A HIGH MOLECULAR WEIGHT THERMOSETTING OR THERMOPLASTIC RESIN CAPABLE OF BEING PROVIDED NEGLIGIBLE PIEZOELECTRICITY OR PYROELECTRICITY BY POLARIZATION TREATMENT, B. FORMING ON THE COATING OF SAID HIGH MOLECULAR WEIGHT RESIN THIN ELECTRODES OF A CONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF METAL AND CARBON BY VACUUM-COATING AND C. SUBJECTING THE POLYMER FILM TO A POLARIZATION TREATMENT USING THE COATINGS OF THE CONDUCTIVE MATERIAL AS THE POLARIZATION ELECTRODES.
Claim 2
Independent Claim
102 words
A METHOD FOR PRODUCING A PIEZOELECTRIC OR PYROELECTRIC ELEMENT WHICH COMPRISES: A. COATING THE SURFACE OF A POLAR FLUORINATED POLYMER FILM CAPABLE OF BEING PROVIDED WITH PIEZOELECTRICITY AND PYROELECTRICITY BY A POLARIZATION TREATMENT WITH A HIGH MOLECULAR WEIGHT THERMOSETTING OR THERMOPLASTIC RESIN CAPABLE OF BEING PROVIDED NEGLIGIBLE PIEZOELECTRICITY OR PYROELECTRICITY BY POLARIZATION TREATMENT, B. FORMING ON THE COATING OF SAID HIGH MOLECULAR WEIGHT RESIN THIN ELECTRODES OF A CONDUCTIVE MATERIAL SELECTED FROM THE GROUP CONSISTING OF METAL AND CARBON BY VACUUM-COATING AND C. SUBJECTING THE POLYMER FILM TO A POLARIZATION TREATMENT USING THE COATINGS OF THE CONDUCTIVE MATERIAL AS THE POLARIZATION ELECTRODES.
Claim 3
Dependent Claim
15 words
The method of claim 1, wherein said polymer film is a stretched polyvinylidene fluoride film.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein said conductive material is a metal.
Claim 5
Independent Claim
103 words
A METHOD FOR PRODUCING A PIEZOELECTRIC OR PYROELECTRIC ELEMENT WHICH COMPRISES: A. COATING THE SURFACE OF A POLAR FLUORINATED POLYMER FILM CAPABLE OF BEING PROVIDED WITH PEIZOELECTRICITY AND PYROELECTRICITY BY A POLARIZATION TREATMENT WITH A HIGH MOLECULAR WEIGHT THERMOSETTING OR THERMOPLASTIC RESIN CAPABLE OF BEING PROVIDED WITH NEGLIGIBLE PIEZOELECTRICITY OR PYROELECTRICITY BY POLARIZATION TREATMENT, B. FORMING ON THE COATING OF SAID HIGH MOLECULAR WEIGHT RESIN THIN ELECTRODES OF A CONDUCTIVE MATERIAL SELECRED FROM THE GROUP CONSISTING OF METAL AND CARBON BY PLATING, AND C. SUBJECTING THE POLYMER FILM TO A POLARIZATION TREATMENT USING THE COATINGS OF THE CONDUCTIVE MATERIAL AS THE POLARIZATION ELECTRODES.
Claim 6
Independent Claim
103 words
A METHOD FOR PRODUCING A PIEZOELECTRIC OR PYROELECTRIC ELEMENT WHICH COMPRISES: A. COATING THE SURFACE OF A POLAR FLUORINATED POLYMER FILM CAPABLE OF BEING PROVIDED WITH PEIZOELECTRICITY AND PYROELECTRICITY BY A POLARIZATION TREATMENT WITH A HIGH MOLECULAR WEIGHT THERMOSETTING OR THERMOPLASTIC RESIN CAPABLE OF BEING PROVIDED WITH NEGLIGIBLE PIEZOELECTRICITY OR PYROELECTRICITY BY POLARIZATION TREATMENT, B. FORMING ON THE COATING OF SAID HIGH MOLECULAR WEIGHT RESIN THIN ELECTRODES OF A CONDUCTIVE MATERIAL SELECRED FROM THE GROUP CONSISTING OF METAL AND CARBON BY PLATING, AND C. SUBJECTING THE POLYMER FILM TO A POLARIZATION TREATMENT USING THE COATINGS OF THE CONDUCTIVE MATERIAL AS THE POLARIZATION ELECTRODES.
Claim 7
Dependent Claim
15 words
The method of claim 4 wherein said polymer film is a stretched polyvinylidene fluoride film.
Claim 8
Dependent Claim
12 words
The method of claim 4 wherein said conductive material is a metal.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |