US4606871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a film from pyroelectric and isotropic piezoelectric polymer blends
Assignee: 3M Co
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Filing: 1984-05-01
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Granted: 1986-08-19
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Expires: 2004-05-01
Abstract
Abstract A pyroelectric and isotropic piezoelectric polymeric film, the film being formed from a blend of polyvinylidene fluoride and at least one polymer miscible therewith at a temperature above the melting point of the polyvinylidene fluoride, and a process for preparing the film comprising forming the film, heating it to a temperature sufficient to render the film substantially amorphous, cooling at a rate and to a temperature sufficient to prevent crystallization, and polarizing the film to render same pyroelectric and isotropically piezoelectric.
Inventors
- 👤 Dennis L. Krueger
- 👤 Neil W. Loeding
- 👤 Claudia I. Poser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:18
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; H10N15/00; H10N15/10; H10N15/15; H10N30/01; H10N30/07; H10N30/074; H10N30/077; H10N30/09; H10N30/098
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
117 words
A method for forming a pyrolectric and isotropic piezoelectric polymeric film comprising: (a) forming a coating solution of a polymer blend in a suitable solvent, said polymer blend comprising polyvinylidene fluoride and at least one polymer which is miscible with said polyvinylidene fluoride at a temperature above the melting point thereof; (b) solvent casting said solution to form a thin polymeric film; (c) removing the solvent from said film and heating same to a sufficient temperature and for a sufficient time to render said film substantially amorphous; (d) cooling said film at a rate and to a temperature sufficient to prevent crystallization of said film, and (e) polarizing said film to render same pyroelectric and isotropically piezoelectric.
Claim 2
Independent Claim
117 words
A method for forming a pyrolectric and isotropic piezoelectric polymeric film comprising: (a) forming a coating solution of a polymer blend in a suitable solvent, said polymer blend comprising polyvinylidene fluoride and at least one polymer which is miscible with said polyvinylidene fluoride at a temperature above the melting point thereof; (b) solvent casting said solution to form a thin polymeric film; (c) removing the solvent from said film and heating same to a sufficient temperature and for a sufficient time to render said film substantially amorphous; (d) cooling said film at a rate and to a temperature sufficient to prevent crystallization of said film, and (e) polarizing said film to render same pyroelectric and isotropically piezoelectric.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said polyvinylidene fluoride comprises at least about 50 percent by weight of said blend.
Claim 4
Dependent Claim
19 words
The process of claim 1 wherein said polymer is selected from the group consisting of acrylates, methacrylates, and polyvinylacetate.
Claim 5
Dependent Claim
134 words
A process for forming a pyroelectric and isotropic piezoelectric polymeric coating on at least a portion of a device comprising: (a) forming a coating solution of a polymer blend in a suitable solvent, said polymer blend comprising polyvinylidene fluoride and at least one polymer which is miscible with said polyvinylidene fluoride at a temperature above the melting point thereof; (b) solvent casting said solution on said device to form a thin polymeric coating on at least a portion thereof; (c) removing the solvent from said coating and heating same to a sufficient temperature and for a sufficient time to render said coating substantially amorphous; (d) cooling said coating at a rate and to a temperature sufficient to prevent crystallization of said coating; and (e) polarizing said coating to render same pyroelectric and isotropically piezoelectric.
Claim 6
Dependent Claim
134 words
A process for forming a pyroelectric and isotropic piezoelectric polymeric coating on at least a portion of a device comprising: (a) forming a coating solution of a polymer blend in a suitable solvent, said polymer blend comprising polyvinylidene fluoride and at least one polymer which is miscible with said polyvinylidene fluoride at a temperature above the melting point thereof; (b) solvent casting said solution on said device to form a thin polymeric coating on at least a portion thereof; (c) removing the solvent from said coating and heating same to a sufficient temperature and for a sufficient time to render said coating substantially amorphous; (d) cooling said coating at a rate and to a temperature sufficient to prevent crystallization of said coating; and (e) polarizing said coating to render same pyroelectric and isotropically piezoelectric.
Claim 7
Dependent Claim
20 words
The process of claim 4 wherein said polyvinylidene fluoride comprises at least about 50 percent by weight of said blend.
Claim 8
Dependent Claim
19 words
The process of claim 4 wherein said polymer is selected from the group consisting of acrylates, methacrylates, and polyvinylacetate.
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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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |