Patent US4975672A successfully refreshed from Google Patents.
US4975672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High power/high frequency inductor
Assignee: National Aeronautics and Space Administration
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Filing: 1989-11-30
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Granted: 1990-12-04
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Expires: 2009-11-30
Abstract
Abstract A toroidal core is mounted on an alignment disc having uniformly distributed circumferential notches or holes therein. Wire is then wound about the toroidal core in a uniform pattern defined by the notches or holes. Prior to winding, the wire may be placed within shrink tubing. The shrink tubing is then wound about the alignment disc and core and then heat-shrunk to positively retain the wire in the uniform position on the toroidal core.
Inventors
- 👤 Colonel W. T. McLyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:40
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/28; H01F27/30; H01F27/306; H01F17/00; H01F17/04; H01F17/06; H01F17/062; Y; Y10; Y10S; Y10S174/00; Y10S174/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A high frequency AC inductor formed of turns of a single continuous Litz wire strand and comprising: an alignment disc, said disc comprising the only alignment disc associated with said inductor; a toroidal, magnetic core mounted on said alignment disc; means in said alignment disc for distributing said turns of Litz wire about the entire toroidal surface of said toroidal core with uniform spacing between the turns of said wire and shrink tubing surrounding said Litz wire, said tubing having been shrunk to positively retain said wire in said uniform spacing about said cove.
Claim 2
Dependent Claim
94 words
A high frequency AC inductor formed of turns of a single continuous Litz wire strand and comprising: an alignment disc, said disc comprising the only alignment disc associated with said inductor; a toroidal, magnetic core mounted on said alignment disc; means in said alignment disc for distributing said turns of Litz wire about the entire toroidal surface of said toroidal core with uniform spacing between the turns of said wire and shrink tubing surrounding said Litz wire, said tubing having been shrunk to positively retain said wire in said uniform spacing about said cove.
Claim 3
Dependent Claim
45 words
The inductor of claim 1 wherein said alignment disc comprises a flat annular ring having first and second circumferences within which said toroidal core is disposed, and wherein said means comprises a first plurality of holes positioned around a first circumference of said annular ring.
Claim 4
Dependent Claim
35 words
The inductor of claim 2 wherein said first circumference comprises the outer circumference of said ring and said means further includes a second plurality of holes positioned around the inner circumference of said annular ring.
Claim 5
Dependent Claim
76 words
The inductor of claim 3 wherein said first plurality of holes comprises a first set of holes uniformly spaced about said outer circumference, each hole of said first set having a center equidistant from the center of said annular ring; and wherein said second plurality of holes comprises a second set of holes uniformly spaced about said inner circumference, each hole of said second set having a center equidistant from the center of said annular ring.
Claim 6
Dependent Claim
24 words
The inductor of claim 1 wherein said alignment disc comprises a flat, substantially annular ring and said means comprises notches formed in said ring.
Claim 7
Dependent Claim
23 words
The inductor of claim 5 wherein said notches comprise a first set of notches uniformly spaced about a first circumference of said ring.
Claim 8
Dependent Claim
35 words
The inductor of claim 5 wherein said first circumference comprises the outer circumference of said ring and wherein said notches comprise a second set of notches uniformly spaced about the inner circumference of said ring.
Claim 9
Dependent Claim
23 words
The inductor of claim 7 wherein said notches comprise a first set of notches uniformly spaced about the first circumference of said ring.
Claim 10
Dependent Claim
52 words
The inductor of claim 2 wherein said wire is wound about said core and through a first set of said first holes and wherein said wire is not wound through a second set of said first holes, said second set of holes being distributed in a uniform manner about said first circumference.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |