US5218512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferroelectric device
Assignee: Rohm Co Ltd
•
Filing: 1992-08-14
•
Granted: 1993-06-08
•
Expires: 2012-08-14
Abstract
Abstract An intermediate layer for relieving film fatigue is formed between the conductor and the ferroelectric layer for constituting a ferroelectric device, whereby the film fatigue can be reduced on the surface with respect to the conductor of the ferroelectric layer by this construction.
Inventors
- 👤 Takashi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:22
CPC Classifications
H; H10; H10B; H10B53/00; H10D; H10D1/00; H10D1/60; H10D1/68; H10D1/682; H10D1/684
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
74 words
A ferroelectric device comprising; a pair of conductor basic plates, a ferroelectric having spontaneous polarization by displacement polarization and interposed in construction between a pair of conductor basic plates, and intermediate layers respectively interposed between the ferroelectric and the conductor for stress relief use on the surface having a perovskite construction where displacement polarization is caused in the same direction as that of the ferroelectric and residual polarization becomes approximately 0 at normal temperature.
Claim 2
Dependent Claim
74 words
A ferroelectric device comprising; a pair of conductor basic plates, a ferroelectric having spontaneous polarization by displacement polarization and interposed in construction between a pair of conductor basic plates, and intermediate layers respectively interposed between the ferroelectric and the conductor for stress relief use on the surface having a perovskite construction where displacement polarization is caused in the same direction as that of the ferroelectric and residual polarization becomes approximately 0 at normal temperature.
Claim 3
Dependent Claim
16 words
The ferroelectric device as fefined in claim 1, wherein the ferroelectric is a ferroelectric thin film.
Claim 4
Dependent Claim
17 words
The ferroelectric device as defined in claim 1, wherein the conductor basic plates are conductor thin films.
Claim 5
Dependent Claim
73 words
A ferroelectric device comprising; a semiconductor basic plate a ferroelectric having spontaneous polarization by the displacement polarization and laminated on the semiconductor basic plate, a conductor laminated in construction on the ferroelectric, an intermediate layer interposed respectively among the ferroelectric, semiconductor and conductor. for stress relief having perobustkite where the displacement polarization is caused in the same direction as that of the ferroelectric and the residual polarization becomes approximately 0 at normal temperature.
Claim 6
Dependent Claim
73 words
A ferroelectric device comprising; a semiconductor basic plate a ferroelectric having spontaneous polarization by the displacement polarization and laminated on the semiconductor basic plate, a conductor laminated in construction on the ferroelectric, an intermediate layer interposed respectively among the ferroelectric, semiconductor and conductor. for stress relief having perobustkite where the displacement polarization is caused in the same direction as that of the ferroelectric and the residual polarization becomes approximately 0 at normal temperature.
References Cited (Backward Citations)
US4503482A
Cited
US4437139A
Cited
US5109357A
Cited
US4948767A
Cited
US5099305A
Cited
US5142437A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |