US4177089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic particles and compacts thereof
Assignee: Arnold Engineering Co
•
Filing: 1978-04-24
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Granted: 1979-12-04
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Expires: 1998-04-24
Abstract
Abstract Magnetic particles and compacts formed therefrom for use as magnetic cores formed of a blend of iron particles and particles of sendust, with the particles containing a coating of an electrical insulator thereon. The particles are compacted and annealed in the practice of this invention to form magnetic cores.
Inventors
- 👤 Billye Bankson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:51
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/20; H01F1/22; H01F1/24; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
72 words
Magnetic powders for compaction into cores consisting essentially of a blend of (1) 30 to 70% by weight iron particles, and (2) 70 to 30% by weight particles of an iron alloy consisting essentially of 7 to 13% by weight silicon, 4 to 7% by weight aluminum and the balance being iron, said particles containing a coating of an electrical insulator thereon to electrically insulate each of the particles from the other.
Claim 2
Dependent Claim
72 words
Magnetic powders for compaction into cores consisting essentially of a blend of (1) 30 to 70% by weight iron particles, and (2) 70 to 30% by weight particles of an iron alloy consisting essentially of 7 to 13% by weight silicon, 4 to 7% by weight aluminum and the balance being iron, said particles containing a coating of an electrical insulator thereon to electrically insulate each of the particles from the other.
Claim 3
Dependent Claim
15 words
Powders as defined in claim 1 wherein the iron particles are particles of sponge iron.
Claim 4
Dependent Claim
13 words
Powders as defined in claim 1 wherein the insulator is an inorganic insulator.
Claim 5
Dependent Claim
24 words
Powders as defined in claim 1 wherein the insulator is a blend of an alkali metal silicate and an alkaline eart h metal oxide.
Claim 6
Dependent Claim
13 words
Powders as defined in claim 1 wherein the insulator also contains a clay.
Claim 7
Dependent Claim
63 words
A magnetic core formed of a blend consisting essentially of (1) 30 to 70% by weight iron particles and (2) 70 to 30% by weight particles of an iron alloy consisting essentially of 7 to 13% by weight silicon, 4 to 7% by weight aluminum and the balance being iron, said particles containing a coating thereon of an electrical insulator and compacted together.
Claim 8
Dependent Claim
63 words
A magnetic core formed of a blend consisting essentially of (1) 30 to 70% by weight iron particles and (2) 70 to 30% by weight particles of an iron alloy consisting essentially of 7 to 13% by weight silicon, 4 to 7% by weight aluminum and the balance being iron, said particles containing a coating thereon of an electrical insulator and compacted together.
Claim 9
Dependent Claim
16 words
A core as defined in claim 6 wherein the iron particles are particles of sponge iron.
Claim 10
Dependent Claim
14 words
A core as defined in claim 6 wherein the insulator is an inorganic insulator.
Claim 11
Dependent Claim
24 words
A core as defined in claim 6 wherein the insulator is a blend of an alkali metal silicate and an alkaline earth metal oxide.
Claim 12
Dependent Claim
14 words
A core as defined in claim 9 wherein the insulator also contains a clay.
Claim 13
Dependent Claim
93 words
A magnetic core formed of a blend consisting essentially of (1) 30 to 70% by weight iron particles and (2) 70 to 30% by weight particles of an iron alloy consisting essentially of 7 to 13% by weight silicon, 4 to 7% by weight aluminum and the balance being iron, said particles containing a coating thereof of an electrical insulator and having been compacted together at a pressure within the range of 60 to 140 tons/sq.in. and annealed in a hydrogen-containing atmosphere at a temperature within the range of 1000° to 1500° F.
Claim 14
Dependent Claim
93 words
A magnetic core formed of a blend consisting essentially of (1) 30 to 70% by weight iron particles and (2) 70 to 30% by weight particles of an iron alloy consisting essentially of 7 to 13% by weight silicon, 4 to 7% by weight aluminum and the balance being iron, said particles containing a coating thereof of an electrical insulator and having been compacted together at a pressure within the range of 60 to 140 tons/sq.in. and annealed in a hydrogen-containing atmosphere at a temperature within the range of 1000° to 1500° F.
Claim 15
Dependent Claim
24 words
A core as defined in claim 11 wherein the insulator is a blend of an alkali metal silicate and an alkaline earth metal oxide.
Claim 16
Dependent Claim
14 words
A core as defined in claim 12 wherein the insulator also contains a clay.
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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) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |