Patent US5632841A successfully refreshed from Google Patents.
US5632841A
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US
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Thin layer composite unimorph ferroelectric driver and sensor
Assignee: STAGED VIBRATION Corp
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Filing: 1995-04-04
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Granted: 1997-05-27
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Expires: 2015-04-04
Abstract
Abstract A method for forming ferroelectric wafers is provided. A prestress layer is placed on the desired mold. A ferroelectric wafer is placed on top of the prestress layer. The layers are heated and then cooled, causing the ferroelectric wafer to become prestressed. The prestress layer may include reinforcing material and the ferroelectric wafer may include electrodes or electrode layers may be placed on either side of the ferroelectric layer. Wafers produced using this method have greatly improved output motion.
Inventors
- 👤 Richard F. Hellbaum
- 👤 Robert G. Bryant
- 👤 Robert L. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:01
CPC Classifications
B; B32; B32B; B32B37/00; B32B37/14; B32B37/144; H; H10; H10N; H10N30/00; H10N30/01; H10N30/07; H10N30/072; H10N30/073; H10N30/20; H10N30/204; H10N30/2047; H10N30/2048; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
58 words
A method for producing ferroelectric devices, comprising: selecting a mold for the device; placing a prestress layer on the mold; placing a ferroelectric layer on the prestress layer to create layer structure; heating the prestress and ferroelectric layers; and cooling the prestress and ferroelectric layers whereby the heating and cooling steps induce a prestress into the layered structure.
Claim 2
Independent Claim
58 words
A method for producing ferroelectric devices, comprising: selecting a mold for the device; placing a prestress layer on the mold; placing a ferroelectric layer on the prestress layer to create layer structure; heating the prestress and ferroelectric layers; and cooling the prestress and ferroelectric layers whereby the heating and cooling steps induce a prestress into the layered structure.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein the prestress layer includes reinforcing material.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the ferroelectric layer includes surface electrodes.
Claim 5
Dependent Claim
32 words
The method of claim 1 further comprising: placing a first electrode layer between the prestress layer and the ferroelectric layer; and placing a second electrode layer on top of the ferroelectric layer.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the prestress layer is an adhesive.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the ferroelectric layer is a piezoelectric material.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein the ferroelectric layer is a piezostrictive material.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the ferroelectric layer is formed from a composite.
References Cited (Backward Citations)
US3631383A
Cited
US5042493A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-05-26 | 2000-11-25 | 2001-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-05-26 | 2004-11-25 | 2005-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-05-26 | 2008-11-25 | 2009-05-27 | $7700.00 | Window Closed / Lapsed |