US5835453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostrictive acoustic projector and polymers used therein
Assignee: United States Department of the Navy
•
Filing: 1997-05-05
•
Granted: 1998-11-10
•
Expires: 2017-05-05
Abstract
Abstract Polymer materials having a low Young's modulus, a low dielectric constant, and a high apparent piezoelectric response when subjected to a high direct bias voltage and a superimposed alternating voltage, used as the active element in an underwater acoustic signal projector of a sonar system.
Inventors
- 👤 Kenneth J. Wynne
- 👤 Robert B. Fox
- 👤 Alan W. Ellinthorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:58
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; H; H10; H10N; H10N30/00; H10N30/80; H10N30/85; H10N30/857; H04; H04R; H04R17/00; H04R17/04; H04R17/08; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
An acoustic radiator which comprises: at least one layer of a highly hydrophobic polymer material having a phase with a very low glass transition temperature, said polymer material having a Young's modulus less than 4×10 8 Newtons per square meter, an electrostrictive response under high DC bias greater than 3 Ångstroms per volt, and a dielectric constant less than 10; biasing means for applying a high dc bias voltage across said at least one layer of polymer material; and means for superimposing a low frequency AC signal on the DC bias voltage; wherein said polymer material is a linear poly(diorganophosphazene) having a general structure (R'R"P═N) n , where: R' is selected from a group consisting of alkoxy, alkyl, aryl, or organometallic groups; R" is selected from a group consisting of alkoxy, alkyl, aryl, or organometallic groups; P is phosphorus; N is nitrogen; and n represents the degree of polymerization.
Claim 2
Dependent Claim
149 words
An acoustic radiator which comprises: at least one layer of a highly hydrophobic polymer material having a phase with a very low glass transition temperature, said polymer material having a Young's modulus less than 4×10 8 Newtons per square meter, an electrostrictive response under high DC bias greater than 3 Ångstroms per volt, and a dielectric constant less than 10; biasing means for applying a high dc bias voltage across said at least one layer of polymer material; and means for superimposing a low frequency AC signal on the DC bias voltage; wherein said polymer material is a linear poly(diorganophosphazene) having a general structure (R'R"P═N) n , where: R' is selected from a group consisting of alkoxy, alkyl, aryl, or organometallic groups; R" is selected from a group consisting of alkoxy, alkyl, aryl, or organometallic groups; P is phosphorus; N is nitrogen; and n represents the degree of polymerization.
Claim 3
Dependent Claim
20 words
An acoustic radiator, as described in claim 1, wherein said radiator is an underwater acoustic radiator of a sonar system.
Claim 4
Dependent Claim
24 words
An acoustic radiator, as described in claim 1, wherein said polymer material is poly(bis(trifluoroethoxy)phosphazene), (F 3 CCH 2 O) 2 P═N ! n .
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) | 2001-11-09 | 2002-05-11 | 2002-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-11-09 | 2006-05-11 | 2006-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-11-09 | 2010-05-11 | 2010-11-10 | $7700.00 | Window Closed / Lapsed |