US5034710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
LC filter device having magnetic resin encapsulating material
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1988-07-21
•
Granted: 1991-07-23
•
Expires: 2008-07-21
Abstract
Abstract An LC filter device includes a dielectric substrate having opposing sets of coil electrode patterns and capacitor electrode patterns. Each set of coil electrode patterns forms an inductive element, and each set of capacitor electrode patterns forms a capacitive element. The inductive and capacitive elements are interconnected to form an LC circuit configuration. The dielectric substrate is encapsulated by a resin coating. The resin coating includes a magnetic material, such as a high frequency ferrite powder, to increase the inductance of the LC filter and to reduce the stray capacitance of the LC filter.
Inventors
- 👤 Masahiko Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:01
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0115; H03H1/00; H03H2001/0021; H03H2001/0078
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
207 words
An LC filter device comprising: a dielectric substrate having opposite first and second surfaces; at least one set of opposing coil electrode patterns respectively located on said first and second surfaces of said dielectric substrate, each of said at least one set of opposing coil electrode patterns forming a corresponding inductive element; at least one set of opposing capacitor electrode patterns respectively located on said first and second surfaces of said dielectric substrate, each of said at least one set of opposing capacitor electrode patterns forming a corresponding capacitive element; first, second and third terminals; means for electrically and operatively interconnecting said at least one set of opposing coil electrode patterns and said at least one set of opposing capacitor electrode patterns to said first, second and third terminals so as to form a predetermined LC filter circuit configuration made up of the inductive and capacitive elements respectively formed by said at least one set of opposing coil electrode patterns and said at least one set of opposing capacitor electrode patterns; a resin coating encapsulating said dielectric substrate, said resin including a magnetic material so as to increase an inductance of the LC filter device, said magnetic material being 50 to 90% by weight of said resin.
Claim 2
Dependent Claim
207 words
An LC filter device comprising: a dielectric substrate having opposite first and second surfaces; at least one set of opposing coil electrode patterns respectively located on said first and second surfaces of said dielectric substrate, each of said at least one set of opposing coil electrode patterns forming a corresponding inductive element; at least one set of opposing capacitor electrode patterns respectively located on said first and second surfaces of said dielectric substrate, each of said at least one set of opposing capacitor electrode patterns forming a corresponding capacitive element; first, second and third terminals; means for electrically and operatively interconnecting said at least one set of opposing coil electrode patterns and said at least one set of opposing capacitor electrode patterns to said first, second and third terminals so as to form a predetermined LC filter circuit configuration made up of the inductive and capacitive elements respectively formed by said at least one set of opposing coil electrode patterns and said at least one set of opposing capacitor electrode patterns; a resin coating encapsulating said dielectric substrate, said resin including a magnetic material so as to increase an inductance of the LC filter device, said magnetic material being 50 to 90% by weight of said resin.
Claim 3
Dependent Claim
18 words
An LC filter device as recited in claim 1, said magnetic material being a high frequency ferrite powder.
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) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |