Patent US3622409A successfully refreshed from Google Patents.
US3622409A
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Method of producing magnetic alloys and novel product
Assignee: Allegheny Ludlum Corp
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Filing: 1969-06-02
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Granted: 1971-11-23
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Expires: 1989-06-02
Abstract
Abstract Described herein is a method of processing an alloy of iron, cobalt, and at least one of vanadium, chromium, molybdenum, and tungsten to develop a novel product having an improved combination of magnetic properties and strength. The method involves continuously annealing the alloy so as to produce an average grain size of ASTM -12 or finer.
Inventors
- 👤 Thomas H Mccunn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:52
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/10; C22C19/00; C22C19/07; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
13 words
A method according to claim 1 wherein said nonoxidizing atmosphere comprises dry hydrogen.
Claim 2
Dependent Claim
47 words
An annealed alloy having nominally 49 percent iron, 49 percent cobalt and 2 percent vanadium, an average grain size of not coarser than ASTM No. 12, a DC magnetic induction of at least 22,000 gausses at 100 oersteds and a yield strength of at least 70,000 p.s.i.
Claim 3
Dependent Claim
11 words
An alloy according to claim 3 having a partially recrystallized microstructure.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |