US3691497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leadless microminiature inductance element with a closed magnetic circuit
Assignee: United States Department of the Army
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Filing: 1970-10-15
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Granted: 1972-09-12
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Expires: 1990-10-15
Abstract
Abstract A Microminiature leadless inductance element having a closed magnetic loop. The inductance element comprises a conventional Ushaped ferromagnetic core having a wire winding around its center. Grooves are provided at the underside of the feet of the U-shaped core so as to receive the terminal portions of the wire winding. The grooves are coated with an electrical conductor and a similar electrically conductive coating is provided on the substrate such that an electrical connection is made without the use of soldering wires. A closed magnetic loop is achieved by applying a ferromagnetic coating along a portion of the substrate surface such that when the U-shaped core is placed on the substrate, all the flux lines generated within the core are conducted through the ferromagnetic coating on the substrate. This eliminates stray flux lines and materially enhances the Q of the system.
Inventors
- 👤 John P Bailey
- 👤 William L Muckelroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:49
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
86 words
A circuit element with a closed magnetic loop comprising a core having at least first and second feet, a wire winding surrounding a portion of said core, a substrate for supporting said core, a coating located along a portion of said substrate for conducting a magnetic field developed in said core, an electrically conductive coating located along a portion of the underside of each of said feet, and an electrically conductive coating on the surface of said substrate in alignment with the coating of said feet.
Claim 2
Dependent Claim
86 words
A circuit element with a closed magnetic loop comprising a core having at least first and second feet, a wire winding surrounding a portion of said core, a substrate for supporting said core, a coating located along a portion of said substrate for conducting a magnetic field developed in said core, an electrically conductive coating located along a portion of the underside of each of said feet, and an electrically conductive coating on the surface of said substrate in alignment with the coating of said feet.
Claim 3
Dependent Claim
31 words
The device of claim 1 further comprising a groove located along a portion of the underside of each of said feet for receiving the two terminal portions of said wire winding.
Claim 4
Dependent Claim
17 words
The device of claim 2 wherein said electrically conductive coating at said feet extend into said groove.
Claim 5
Dependent Claim
71 words
A circuit element with a closed magnetic loop comprising; a. a solitary and non-planar core having at least first and second Supporting feet; b. a conductive winding surrounding a portion of said core; c. A substrate for supporting said core; and d. a magnetically permeable coating located along a portion of said substrate and directly beneath the underside of said supporting feet for conducting a magnetic field developed in said core.
Claim 6
Dependent Claim
71 words
A circuit element with a closed magnetic loop comprising; a. a solitary and non-planar core having at least first and second Supporting feet; b. a conductive winding surrounding a portion of said core; c. A substrate for supporting said core; and d. a magnetically permeable coating located along a portion of said substrate and directly beneath the underside of said supporting feet for conducting a magnetic field developed in said core.
Claim 7
Dependent Claim
110 words
A circuit element with a closed magnetic loop comprising a solitary and non-planar core having at least first and second supporting feet, a conductive winding surrounding a portion of said core, a substrate for supporting said core, a magnetically permeable coating located along a portion of said substrate for conducting a magnetic field developed in said core, said coating having sufficient surface area to receive the entire magnetic field within said core, a first electrically conductive coating located along a portion of the underside of each of said feet, and a second electrically conductive coating located on the surface of said substrate in alignment with said first electrically conductive coating.
Claim 8
Dependent Claim
110 words
A circuit element with a closed magnetic loop comprising a solitary and non-planar core having at least first and second supporting feet, a conductive winding surrounding a portion of said core, a substrate for supporting said core, a magnetically permeable coating located along a portion of said substrate for conducting a magnetic field developed in said core, said coating having sufficient surface area to receive the entire magnetic field within said core, a first electrically conductive coating located along a portion of the underside of each of said feet, and a second electrically conductive coating located on the surface of said substrate in alignment with said first electrically conductive coating.
Claim 9
Dependent Claim
31 words
The device of claim 5 further comprising a groove located along a portion of the underside of each of said feet for receiving the two terminal portions of said conductive winding.
Claim 10
Dependent Claim
17 words
The device of claim 6 wherein said electrically conductive coating at said feet extend into said groove.
Claim 11
Dependent Claim
151 words
A circuit element with a closed magnetic loop comprising a solitary and non-planar core having at least first and second supporting feet, a conductive winding surrounding a portion of said core, a substrate for supporting said core, a magnetically permeable coating located along a portion of said substrate for conducting a magnetic field developed in said core, said coating having sufficient surface area to receive the entire magnetic field within said core, a first electrically conductive coating located along a portion of the underside of each of said feet, a second electrically conductive coating on the surface of said substrate in alignment with said first electrically conductive coating, a groove located along a portion of the underside of each of said feet for receiving the two terminal portions of said conductive winding, wherein said first electrically conductive coating extends into said groove, and wherein said winding is attached to said core.
Claim 12
Dependent Claim
151 words
A circuit element with a closed magnetic loop comprising a solitary and non-planar core having at least first and second supporting feet, a conductive winding surrounding a portion of said core, a substrate for supporting said core, a magnetically permeable coating located along a portion of said substrate for conducting a magnetic field developed in said core, said coating having sufficient surface area to receive the entire magnetic field within said core, a first electrically conductive coating located along a portion of the underside of each of said feet, a second electrically conductive coating on the surface of said substrate in alignment with said first electrically conductive coating, a groove located along a portion of the underside of each of said feet for receiving the two terminal portions of said conductive winding, wherein said first electrically conductive coating extends into said groove, and wherein said winding is attached to said core.
Claim 13
Dependent Claim
30 words
The device of claim 8 wherein said core further comprises at least two opposite magnetic poles formed into supporting feet each juxtaposed to a portion of said magnetically permeable coating.
Claim 14
Dependent Claim
14 words
The device of claim 8 wherein said core comprises an H-shaped magnetically permeable material.
Claim 15
Dependent Claim
14 words
The device of claim 8 wherein said core comprises a U-shaped magnetically permeable material.
Claim 16
Dependent Claim
42 words
The device of claim 4 further comprising an electrically conductive coating located along a portion of the underside of each of said feet and an electrically conductive coating on the surface of said substrate in alignment with the coating of said feet.
Claim 17
Dependent Claim
31 words
The device of claim 12 further comprising a groove located along a portion of the underside of each of said feet for receiving the two terminal portions of said conductive winding.
Claim 18
Dependent Claim
17 words
The device of claim 13 wherein said electrically conductive coating at said feet extend into said groove.
Claim 19
Dependent Claim
13 words
The device of claim 13 wherein said winding is attached to said core.
Claim 20
Dependent Claim
31 words
The device of claim 15 wherein said core further comprises at least two opposite magnetic poles formed into supporting feet each one opposed to a portion of said magnetically permeable coating.
Claim 21
Dependent Claim
14 words
The device of claim 16 wherein said core comprises an H-shaped magnetically permeable material.
Claim 22
Dependent Claim
14 words
The device of claim 16 wherein said core comprises a U-shaped magnetically permeable material.
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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |