US4400674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil unit
Assignee: TDK Corp
•
Filing: 1980-09-09
•
Granted: 1983-08-23
•
Expires: 2000-09-09
Abstract
Abstract A coil unit formed of a coil-wound inner core partially circumferentially encased by an outer core. The coil unit is mounted on a plate with the outer core externally exposed and covering the lead-in wires to the coil which are adhered to contacts on the plate.
Inventors
- 👤 Takayuki Suda
- 👤 Koichi Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:51
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/043; H01F17/045; H05; H05K; H05K1/00; H05K1/18; H05K1/182
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
89 words
A coil unit comprising an outer core in the form of about a half cylinder, and a drum-shaped bobbin core provided with a flange on each end thereof and having a coil wound thereon, said outer core and said bobbin core being assembled with a part of the outer periphery of said flanges fixed to the inner periphery of said outer core and with the outer core encasing the bobbin core for only about one-half the circumference of said bobbin core, the remainder of said bobbin core being non-encased.
Claim 2
Dependent Claim
89 words
A coil unit comprising an outer core in the form of about a half cylinder, and a drum-shaped bobbin core provided with a flange on each end thereof and having a coil wound thereon, said outer core and said bobbin core being assembled with a part of the outer periphery of said flanges fixed to the inner periphery of said outer core and with the outer core encasing the bobbin core for only about one-half the circumference of said bobbin core, the remainder of said bobbin core being non-encased.
Claim 3
Dependent Claim
18 words
A coil unit as set forth in claim 1, wherein electrode plates are provided on said outer core.
Claim 4
Dependent Claim
18 words
A coil unit as set forth in claim 1, wherein metallic caps are provided on said outer core.
Claim 5
Dependent Claim
53 words
A coil unit comprising an outer core and an inner core, said inner core having a coil wound thereon, and said outer core being positioned against and partially circumferentially encasing said coil-wound inner core for only about one-half the circumference of said inner core, the remainder of said coil-wound inner core being non-encased.
Claim 6
Dependent Claim
53 words
A coil unit comprising an outer core and an inner core, said inner core having a coil wound thereon, and said outer core being positioned against and partially circumferentially encasing said coil-wound inner core for only about one-half the circumference of said inner core, the remainder of said coil-wound inner core being non-encased.
Claim 7
Dependent Claim
31 words
A coil unit as set forth in claim 4, in combination with a mounting plate having an opening therein into which said non-encased part of said coil-wound inner core is positioned.
Claim 8
Dependent Claim
39 words
A coil unit as set forth in claim 4, wherein said inner core includes a flange on each end thereof, and in combination with a mounting plate having one or more openings therein into which said flanges are positioned.
Claim 9
Dependent Claim
29 words
A coil unit as set forth in claim 5 or 6, wherein said mounting plate includes electrodes thereon electrically connected to said coil and positioned beneath said outer core.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |