US4364020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amorphous metal core laminations
Assignee: ABB Inc USA
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Filing: 1981-02-06
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Granted: 1982-12-14
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Expires: 2001-02-06
Abstract
Abstract A magnetic core for use with electrical windings characterized by a plurality of groups of butt-jointed laminations of high permeability, amorphous material with each lamination group having a layer of protective material surrounding the outermost lamination and comprising a strip of material having a melting point above the temperature range of from about 340 DEG C. to 420 DEG C., whereby each lamination group is protected from damage during handling.
Inventors
- 👤 Kou C. Lin
- 👤 Belvin B. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:54
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/24; H01F27/245; H01F27/2455
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
96 words
A magnetic core for use with electrical coils comprising: a plurality of groups of butt-jointed laminations of an amorphous alloy having high permeability and brittleness as annealed, each group of laminations comprising an external layer of protective material having a melting point above the temperature range of from about 340° C. to about 420° C. and having high permeability in the direction of grain orientation, whereby each lamination group is protected from damage during handling, and the assembly of the laminations of amorphous metal an external layer being in surface-to-surface contact and devoid of interlaminar compounds.
Claim 2
Dependent Claim
96 words
A magnetic core for use with electrical coils comprising: a plurality of groups of butt-jointed laminations of an amorphous alloy having high permeability and brittleness as annealed, each group of laminations comprising an external layer of protective material having a melting point above the temperature range of from about 340° C. to about 420° C. and having high permeability in the direction of grain orientation, whereby each lamination group is protected from damage during handling, and the assembly of the laminations of amorphous metal an external layer being in surface-to-surface contact and devoid of interlaminar compounds.
Claim 3
Dependent Claim
26 words
The core of claim 1 in which the high permeability, amorphous alloy has an annealing temperature range of from about 340° C. to about 420° C.
Claim 4
Dependent Claim
27 words
The core of claim 1 in which the external layer of protective material is comprised of about 3% silicon with the balance being iron and some impurities.
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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) | 1985-12-13 | 1986-06-14 | 1986-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-13 | 1990-06-14 | 1990-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-13 | 1994-06-14 | 1994-12-14 | $7700.00 | Window Closed / Lapsed |