US3842379A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foldable outer extensions of a laminated core structure
Assignee: GEM ELECTRO MAGNETICS CO Inc
•
Filing: 1973-08-28
•
Granted: 1974-10-15
•
Expires: 1993-08-28
Abstract
Abstract Magnetic core structures formed by stacks of laminations, of which the outermost laminations have protective extensions. The latter are folded against the edges of the inner laminations to permit windings to be wrapped around the laminations without being damaged by sharp edges of the inner laminations. The protective extensions are particularly desirable for small-scale magnetic cores that are formed by etching techniques which leave comparatively ragged edges on the inner laminations and could otherwise damage the windings.
Inventors
- 👤 G Barnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:49
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; G; G11; G11B; G11B5/00; G11B5/127; G11B5/147; G11B5/1475; G11B5/17
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A magnetic core structure which comprises a magnetically permeable laminar member, and a protective extension for said structure attached to said member and foldable with respect thereto, wherein said laminar member is the outer most member of a stack of laminations and said extension is foldable against the edges of the inner laminations.
Claim 2
Dependent Claim
53 words
A magnetic core structure which comprises a magnetically permeable laminar member, and a protective extension for said structure attached to said member and foldable with respect thereto, wherein said laminar member is the outer most member of a stack of laminations and said extension is foldable against the edges of the inner laminations.
Claim 3
Dependent Claim
49 words
A magnetic core structure as defined in claim 1 wherein said protective extension is in the form of a thin, elongated strip which is integral with said member and is foldable against an edge of any adjoining laminar member to protect said structure from the effects of said edge.
Claim 4
Dependent Claim
24 words
A magnetic core structure as defined in claim 1 further including a second protective extension attached to said member and foldable with respect thereto.
Claim 5
Dependent Claim
24 words
A magnetic core structure as defined in claim 1 wherein said laminar member is one of a group of laminar members constituting a fret.
Claim 6
Dependent Claim
30 words
A magnetic core structure as defined in claim 4 wherein said fret is superimposed upon at least one other fret constituted by a group of laminar members without protective extensions.
Claim 7
Dependent Claim
14 words
A magnetic core structure as defined in claim 1 wherein said extension is folded.
Claim 8
Dependent Claim
27 words
A magnetic core structure as defined in claim 6 wherein said stack of laminations forms a partial magnetic core and said core is wound with a coil.
Claim 9
Dependent Claim
20 words
A magnetic core structure as defined in claim 7 wherein the coil wound core is inserted into a half shell.
Claim 10
Dependent Claim
24 words
A magnetic core structure as defined in claim 8 wherein said half shell is joined with another half shell to form a magnetic head.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |