Patent US5355277A successfully refreshed from Google Patents.
US5355277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film capacitor
Assignee: Rohm Co Ltd
•
Filing: 1992-12-17
•
Granted: 1994-10-11
•
Expires: 2012-12-17
Abstract
Abstract A thin film capacitor includes a first capacitor composed of a ferroelectric film and a supplementary second capacitor composed of the ferroelectric film surrounding the first capacitor. In a capacitor of the present invention, the second capacitor is formed around a capacitor and the polarized condition thereof is possible to be controlled. Due to this original switching time of the first capacitor can be flexibly adjusted, and there is a significant advantage that switching characteristic of a capacitor can be greatly improved with minimum cost.
Inventors
- 👤 Kazuhiro Hoshiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:48
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/38; H01G4/385
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A thin film capacitor comprising: a first capacitor including a ferroelectric film, and a first electrode arranged at one surface of said ferroelectric film and said first electrode arranged at the other surface of said ferroelectric film; and A supplementary second capacitor including said ferroelectric film, and a second electrode arranged at said one surface of said ferroelectric film and said second electrode arranged at said other surface of said ferroelectric film, said supplementary second capacitor surrounding said first capacitor.
Claim 2
Dependent Claim
80 words
A thin film capacitor comprising: a first capacitor including a ferroelectric film, and a first electrode arranged at one surface of said ferroelectric film and said first electrode arranged at the other surface of said ferroelectric film; and A supplementary second capacitor including said ferroelectric film, and a second electrode arranged at said one surface of said ferroelectric film and said second electrode arranged at said other surface of said ferroelectric film, said supplementary second capacitor surrounding said first capacitor.
Claim 3
Dependent Claim
30 words
The thin film capacitor of claim 1 wherein one of the seemed electrodes of the supplement second capacitor is formed continuously with a corresponding first electrode of the first capacitor.
Claim 4
Dependent Claim
27 words
The thin film capacitor of claim 1 wherein both second electrodes of the supplementary second capacitor are formed separately from corresponding first electrodes of the first capacitor.
Claim 5
Dependent Claim
70 words
The thin film capacitor of claim 1 wherein the second electrode arranged at said one surface of said ferroelectric film of the supplementary second capacitor is partially interrupted and a film wiring to the first capacitor passes through an interrupted region on said ferroelectric film, wherein both first and second electrodes arranged at said one surface of said ferroelectric film of the first and the second capacitors are electrically separated.
Claim 6
Dependent Claim
70 words
The thin film capacitor of claim 1 wherein the second electrode arranged at said one surface of said ferroelectric film of the supplementary second capacitor is endlessly formed and the film wiring to the first electrode arranged at said one surface of said ferroelectric film passes on the second electrode of the supplementary second capacitor arranged at said one surface of said ferroelectric film with an insulating film existing therebetween.
References Cited (Backward Citations)
US4312027A
Cited
US4437139A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-10 | 1998-04-11 | 1998-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-10 | 2002-04-11 | 2002-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-10 | 2006-04-11 | 2006-10-11 | $7700.00 | Window Closed / Lapsed |