US4933026A
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Soft magnetic alloys
Assignee: TELCON Ltd
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Filing: 1988-07-01
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Granted: 1990-06-12
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Expires: 2008-07-01
Abstract
Abstract A soft magnetic cobalt/iron alloy with high saturation magnetization comprising 0.15%-0.5% tantalum or niobium or tantalum plus niobium, 33-55% cobalt, the balance consisting of iron apart from very minor alloy ingredients and incidental impurities.
Inventors
- 👤 Rees D. Rawlings
- 👤 Rodney V. Major
- 👤 Clive M. Orrock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:52
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; C22C38/00; C22C38/10; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147
Claims Analysis
Total Claims: 37
Claim 1
Independent Claim
40 words
A soft magnetic cobalt/iron alloy with high saturation magnetization which consists by weight essentially of about 0.15% -0.5% in total of tantalum and/or niobium, 33-55% cobalt, the balance consisting of iron apart from very minor alloy ingredients and incidental impurities.
Claim 2
Dependent Claim
40 words
A soft magnetic cobalt/iron alloy with high saturation magnetization which consists by weight essentially of about 0.15% -0.5% in total of tantalum and/or niobium, 33-55% cobalt, the balance consisting of iron apart from very minor alloy ingredients and incidental impurities.
Claim 3
Dependent Claim
40 words
An alloy according to claim 1 and in which the minor alloying ingredients assist deoxidation during melting of said alloy and are restricted to a maximum of 0.3% manganese, a maximum of 0.1% silicon and a maximum of 0.03% carbon.
Claim 4
Dependent Claim
17 words
An alloy according to claim 2 in which the incidental impurities are restricted to 0.3% maximum total.
Claim 5
Dependent Claim
17 words
An alloy according to claim 3 in which nickel is present as one of the incidental impurities.
Claim 6
Dependent Claim
16 words
An alloy according to claim 4 containing 0.2 to 0.4% in total of tantalum and niobium.
Claim 7
Dependent Claim
27 words
An alloy according to claim 5 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 8
Dependent Claim
30 words
An alloy according to claim 5 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 9
Dependent Claim
27 words
An alloy according to claim 4 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 10
Dependent Claim
30 words
An alloy according to claim 4 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 11
Dependent Claim
16 words
An alloy according to claim 3 containing 0.2 to 0.4% in total of tantalum and niobium.
Claim 12
Dependent Claim
27 words
An alloy according to claim 10 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 13
Dependent Claim
30 words
An alloy according to claim 10 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 14
Dependent Claim
27 words
An alloy according to claim 3 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 15
Dependent Claim
30 words
An alloy according to claim 3 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 16
Dependent Claim
16 words
An alloy according to claim 2 containing 0.2 to 0.4% in total of tantalum and niobium.
Claim 17
Dependent Claim
26 words
An alloy according to claim 15 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 per meter.
Claim 18
Dependent Claim
30 words
An alloy according to claim 15 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 19
Dependent Claim
27 words
An alloy according to claim 2 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 20
Dependent Claim
30 words
An alloy according to claim 2 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 21
Dependent Claim
17 words
An alloy according to claim 1 in which the incidental impurities are restricted to 0.3% maximum total.
Claim 22
Dependent Claim
17 words
An alloy according to claim 20 in which nickel is present as one of the incidental impurities.
Claim 23
Dependent Claim
16 words
An alloy according to claim 21 containing 0.2 to 0.4% in total of tantalum and niobium.
Claim 24
Dependent Claim
27 words
An alloy according to claim 22 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 25
Dependent Claim
30 words
An alloy according to claim 22 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 26
Dependent Claim
27 words
An alloy according to claim 21 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 27
Dependent Claim
30 words
An alloy according to claim 21 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 28
Dependent Claim
16 words
An alloy according to claim 20 containing 0.2 to 0.4% in total of tantalum and niobium.
Claim 29
Dependent Claim
27 words
An alloy according to claim 27 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 30
Dependent Claim
30 words
An alloy according to claim 27 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 31
Dependent Claim
27 words
An alloy according to claim 20 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 32
Dependent Claim
30 words
An alloy according to claim 20 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 33
Dependent Claim
16 words
An alloy according to claim 1 containing 0.2 to 0.4% in total of tantalum and niobium.
Claim 34
Dependent Claim
27 words
An alloy according to claim 32 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 35
Dependent Claim
30 words
An alloy according to claim 32 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
Claim 36
Dependent Claim
27 words
An alloy according to claim 1 which is ductile and has a saturation magnetization within the range 2.41 to 2.45 Tesla measured at 40,000 amps per meter.
Claim 37
Dependent Claim
30 words
An alloy according to claim 1 which has been heat treated at temperatures in the range 895° C. to 950° and exhibiting a coercive force of less than 50 A/m.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |