Patent US3615910A successfully refreshed from Google Patents.
US3615910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic alloy and core
Assignee: Hitachi Ltd
•
Filing: 1967-12-28
•
Granted: 1971-10-26
•
Expires: 1987-12-28
Abstract
Abstract A magnetic alloy consisting essentially of less than 30 weight percent of cobalt, less than 30 weight percent of iron, less than 5 weight percent of a metal selected from the group consisting of copper and molybdenum, and the balance being essentially nickel and cores made therewith. The alloy has a Curie point greater than 620* C. and excellent rectangular hysteresis loop characteristics, such as, a Br/B10 value greater than about 90 percent.
Inventors
- 👤 Sadami Tomita
- 👤 Hiroyuki Oouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:27
CPC Classifications
C; C22; C22C; C22C19/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
13 words
A magnetic alloy according to claim 1, wherein said additive element is copper.
Claim 2
Dependent Claim
13 words
A magnetic alloy according to claim 1, wherein said additive element is molybdenum.
Claim 3
Dependent Claim
99 words
A magnetic sheet material used for a saturable reactor core which comprises a magnetic alloy having rectangular hysteresis loop characteristics represented by a Br/B10 value greater than about 90 percent, imparted by a magnetic cooling treatment, a sharply rising magnetization curve characteristic, and a Curie point greater than about 620* C., consisting essentially of from about 7 to 21 percent by weight of cobalt, from about 20 to 25 percent by weight of iron, from about 1.5 to 4 percent by weight of an element sElected from the group consisting of molybdenum and copper, and the balance being nickel.
Claim 4
Dependent Claim
36 words
A magnetic sheet material according to claim 4, in which the sheet material is U-shaped and the ratio of the length l of the legs to the length l3 of the yoke is at least 2.5.
Claim 5
Dependent Claim
23 words
A magnetic sheet material according to claim 4, in which the magnetic alloy has an electric resistivity greater than about 30 Omega -cm.
Claim 6
Dependent Claim
15 words
A magnetic alloy sheet material according to claim 4, wherein said additive element is copper.
Claim 7
Dependent Claim
15 words
A magnetic alloy sheet material according to claim 4, wherein said additive element is molybdenum.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |