US4627138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making piezoelectric/pyroelectric elements
Assignee: Dow Chemical Co
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Filing: 1985-08-06
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Granted: 1986-12-09
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Expires: 2005-08-06
Abstract
Abstract Multilayer coextruded piezoelectric/pyroelectric elements and method for manufacturing these elements are disclosed. The layer configuration of the element permits easy application of conductive material to two separate faces and thus prevents short-circuiting.
Inventors
- 👤 Jang-hi Im
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:41
CPC Classifications
H; H10; H10N; H10N15/00; H10N15/10; H10N30/00; H10N30/01; H10N30/05; H10N30/08; H10N30/084; 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
81 words
A method for manufacturing a piezoelectric element comprising the steps of: (a) coextruding alternating layers of (1) polymeric piezoelectric meterial; and (2) polymeric electrode material arranged so that a single edge of each successive layer of polymeric electrode material is alternatingly exposed to one of two separate faces of the piezoelectric element; (b) electrically interconnecting on each of the two separate faces the exposed single edges of polymeric electrode material layers with conductive material; and (c) polarizing the polymeric piezoelectric material.
Claim 2
Independent Claim
81 words
A method for manufacturing a piezoelectric element comprising the steps of: (a) coextruding alternating layers of (1) polymeric piezoelectric meterial; and (2) polymeric electrode material arranged so that a single edge of each successive layer of polymeric electrode material is alternatingly exposed to one of two separate faces of the piezoelectric element; (b) electrically interconnecting on each of the two separate faces the exposed single edges of polymeric electrode material layers with conductive material; and (c) polarizing the polymeric piezoelectric material.
Claim 3
Dependent Claim
35 words
A method for manufacturing a piezoelectric element, as recited in claim 1, further comprising the step of attaching conducting wires to the conductive material present on each of the two separate faces prior to polarization.
Claim 4
Dependent Claim
23 words
A method for manufacturing a piezoelectric element, as recited in claim 1, wherein the coextruded polymeric piezoelectric material comprises at least 20 layers.
Claim 5
Dependent Claim
23 words
A method for manufacturing a piezoelectric element, as recited in claim 1, wherein the coextruded polymeric piezoelectric material comprises at least 100 layers.
Claim 6
Dependent Claim
21 words
A method for manufacturing a piezoelectric element, as recited in claim 1, wherein the coextruded polymeric piezoelectric material is polyvinylidene fluoride.
Claim 7
Dependent Claim
50 words
A method for manufacturing a piezoelectric element, as recited in claim 1, wherein the coextruded layers of the polymeric piezoelectric material have a thickness of from about 0.05 micron to about 125 microns and the coextruded layers of the polymeric electrode material have a thickness less than about 50 microns.
Claim 8
Dependent Claim
50 words
A method for manufacturing a piezoelectric element, as recited in claim 1, wherein the coextruded layers of the polymeric piezoelectric material have a thickness of from about 0.05 micron to about 125 microns and the coextruded layers of the polymeric electrode material have a thickness less than about 25 microns.
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) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |