US4779068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noise suppression inductor
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1986-09-03
•
Granted: 1988-10-18
•
Expires: 2006-09-03
Abstract
Abstract A noise suppression inductor including a bobbin having a spool divided into a plurality of spool portions, a core mounted on the bobbin, at least one coil wound around the spool portions into a plurality of coil portions and a plurality of terminal pins connected to opposite ends of the coil, in which at least one of the coil portions is composed of a first part having one or two winding layers and a second part having one winding layer and at least another one of the coil portions has not less than two winding layers.
Inventors
- 👤 Yukio Sakamoto
- 👤 Mamoru Zushi
- 👤 Masahiro Bando
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:19
CPC Classifications
H; H01; H01F; H01F37/00; H01F17/00; H01F17/04; H01F17/045; H01F27/00; H01F27/24; H01F27/26; H01F27/263; H01F5/00; H01F5/02; H01F2005/022
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
In a noise suppression inductor including a bobbin having a spool divided into a plurality of spool portions, a core mounted on said bobbin, at least one coil on said spool portions having a plurality of coil portions and a plurality of terminal pins connected to opposite ends of said coil, the improvement comprising: at least one of said coil portions having no more than two winding layers the second of which is incomplete and having a first self-resonant frequency in the frequency range of noise to be suppressed; at least another one of said coil portions having not less than two winding layers and having a second self-resonant frequency in the frequency range of noise to be suppressed and which is different from said first self-resonant frequency.
Claim 2
Dependent Claim
128 words
In a noise suppression inductor including a bobbin having a spool divided into a plurality of spool portions, a core mounted on said bobbin, at least one coil on said spool portions having a plurality of coil portions and a plurality of terminal pins connected to opposite ends of said coil, the improvement comprising: at least one of said coil portions having no more than two winding layers the second of which is incomplete and having a first self-resonant frequency in the frequency range of noise to be suppressed; at least another one of said coil portions having not less than two winding layers and having a second self-resonant frequency in the frequency range of noise to be suppressed and which is different from said first self-resonant frequency.
Claim 3
Dependent Claim
49 words
A noise suppression inductor as claimed in claim 1, wherein a pair of coils are employed and said spool is divided into two sets of a plurality of said spool portions and respective coils are wound around each of the two sets of a plurality of said spool portions.
Claim 4
Dependent Claim
27 words
A noise suppression inductor as claimed in claim 1, wherein said spool portions have an identical winding dimensions in the direction of the length of said core.
Claim 5
Dependent Claim
27 words
A noise suppression inductor as claimed in claim 2, wherein said spool portions have an identical winding dimensions in the direction of the length of said core.
Claim 6
Dependent Claim
59 words
A noise suppression inductor as claimed in claim 1, wherein said bobbin has a vertical guide portion for guiding said core vertically and a horizontal guide portion for guiding said core horizontally whereby said core can be mounted on an upper portion on opposite side portions of said bobbin through said vertical guide portion on said horizontal guide portion.
Claim 7
Dependent Claim
17 words
A noise suppression inductor as claimed in claim 1, wherein said core is a closed magnetic circuit.
Claim 8
Dependent Claim
17 words
A noise suppression inductor as claimed in claim 1, wherein said core is a closed magnetic circuit.
Claim 9
Dependent Claim
17 words
A noise suppression inductor as claimed in claim 5, wherein said core is a closed magnetic circuit.
Claim 10
Dependent Claim
38 words
A noise suppression inductor as claimed in claim 1, wherein said core is constituted by a pair of core portions, said noise suppression inductor further including a spring plate for elastically pressing said core portions against each other.
Claim 11
Dependent Claim
38 words
A noise suppression inductor as claimed in claim 8, wherein said core is constituted by a pair of core portions, said noise suppression inductor further including a spring plate for elastically pressing said core portions against each other.
Claim 12
Dependent Claim
22 words
A noise suppression inductor as claimed in claim 1, wherein said terminal pins are disposed at corner portions of said bobbin, respectively.
Claim 13
Dependent Claim
22 words
A noise suppression inductor as claimed in claim 10, wherein said terminal pins are disposed at corner portions of said bobbin, respectively.
References Cited (Backward Citations)
US1614309A
Cited
US1945544A
Cited
US3191135A
Cited
GB1161400A
Cited
JPS5221614A
Cited
JPS5221613A
Cited
US4074210A
Cited
US4156888A
Cited
DE2830128A1
Cited
US4229786A
Cited
US4227143A
Cited
FR2422236A1
Cited
US4388568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |