US5431987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise filter
Assignee: Individual
•
Filing: 1993-11-01
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Granted: 1995-07-11
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Expires: 2013-11-01
Abstract
Abstract A noise filter used in a signal transmission or power supply circuit and the like for suppressing noise passing therethrough comprises a first spiral electrode formed on an insulating substrate and a second spiral electrode formed over the first spiral electrode by way of a dielectric layer. The noise filter could also include a dielectric layer formed over the first spiral electrode and the insulating substrate with the second spiral electrode formed in such a manner to partly overlap with the first spiral electrode. Preferably, a high purity semiconductor substrate having a large bulk resistance is used as the insulating substrate.
Inventors
- 👤 Takeshi Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:09
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/16; H03; H03H; H03H1/00; H03H1/0007; H03H7/00; H03H7/01; H03H7/0115; H05K1/165; H03H2001/0021; H03H2001/0064; H03H2001/0078; H05K1/02; H05K1/0213; H05K1/0216; H05K2201/00; H05K2201/10; H05K2201/10007; H05K2201/1006; H05K3/00; H05K3/46; H05K3/4644; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
33 words
A noise filter characterized in that a first spiral electrode is formed on an insulating substrate and a second spiral electrode is formed on said first spiral electrode by way of dielectric layer.
Claim 2
Dependent Claim
33 words
A noise filter characterized in that a first spiral electrode is formed on an insulating substrate and a second spiral electrode is formed on said first spiral electrode by way of dielectric layer.
Claim 3
Dependent Claim
50 words
A noise filter characterized in that a first spiral electrode is formed on an insulating substrate, a dielectric layer is formed on said first spiral electrode and said insulating substrate, and a second spiral electrode is formed on said dielectric layer at least partly overlapping with said first spiral electrode.
Claim 4
Dependent Claim
50 words
A noise filter characterized in that a first spiral electrode is formed on an insulating substrate, a dielectric layer is formed on said first spiral electrode and said insulating substrate, and a second spiral electrode is formed on said dielectric layer at least partly overlapping with said first spiral electrode.
Claim 5
Dependent Claim
45 words
A noise filter according to claim 1 characterized in that at least one end of one of said spiral electrode is grounded and both ends of the other spiral electrode are connected in series with a signal transmission circuit to operate in a normal mode.
Claim 6
Dependent Claim
45 words
A noise filter according to claim 2 characterized in that at least one end of one of said spiral electrode is grounded and both ends of the other spiral electrode are connected in series with a signal transmission circuit to operate in a normal mode.
Claim 7
Dependent Claim
32 words
A noise filter according to claim 1 characterized in that both ends of said both spiral electrodes are connected in series with a signal transmission circuit to operate in a common mode.
Claim 8
Dependent Claim
32 words
A noise filter according to claim 2 characterized in that both ends of said both spiral electrodes are connected in series with a signal transmission circuit to operate in a common mode.
Claim 9
Dependent Claim
21 words
A noise filter according to claim 1 characterized in that a high purity semiconductor substrate is used as said insulating substrate.
Claim 10
Dependent Claim
21 words
A noise filter according to claim 2 characterized in that a high purity semiconductor substrate is used as said insulating substrate.
Claim 11
Dependent Claim
21 words
A noise filter according to claim 3 characterized in that a high purity semiconductor substrate is used as said insulating substrate.
Claim 12
Dependent Claim
21 words
A noise filter according to claim 4 characterized in that a high purity semiconductor substrate is used as said insulating substrate.
Claim 13
Dependent Claim
20 words
A noise filter according to claim 1 characterized in that a magnetic insulating substrate is used as said insulating substrate.
Claim 14
Dependent Claim
20 words
A noise filter according to claim 2 characterized in that a magnetic insulating substrate is used as said insulating substrate.
Claim 15
Dependent Claim
20 words
A noise filter according to claim 3 characterized in that a magnetic insulating substrate is used as said insulating substrate.
Claim 16
Dependent Claim
20 words
A noise filter according to claim 4 characterized in that a magnetic insulating substrate is used as said insulating substrate.
Claim 17
Dependent Claim
25 words
A noise filter according to claim 1 characterized in that a plurality of noise filters are formed as an integral part on an insulating substrate.
Claim 18
Dependent Claim
25 words
A noise filter according to claim 2 characterized in that a plurality of noise filters are formed as an integral part on an insulating substrate.
Claim 19
Dependent Claim
25 words
A noise filter according to claim 3 characterized in that a plurality of noise filters are formed as an integral part on an insulating substrate.
Claim 20
Dependent Claim
25 words
A noise filter according to claim 4 characterized in that a plurality of noise filters are formed as an integral part on an insulating substrate.
Claim 21
Dependent Claim
17 words
A noise filter according to claim 1 fabricated on said substrate which also includes fabricated IC circuits.
Claim 22
Dependent Claim
17 words
A noise filter according to claim 2 fabricated on said substrate which also includes fabricated IC circuits.
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) | 1998-07-10 | 1999-01-09 | 1999-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-10 | 2003-01-09 | 2003-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-10 | 2007-01-09 | 2007-07-11 | $7700.00 | Window Closed / Lapsed |