US3556876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating nickel-iron-base alloy strip to increase induction rise and pulse permeability
Assignee: Vacuumschmelze GmbH and Co KG
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Filing: 1968-01-08
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Granted: 1971-01-19
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Expires: 1988-01-08
Abstract
Abstract NICKEL-IRON-MOLYBDENUM ALLOY STRIP, OPTIONALLY INCLUDING COPPER, WHICH HAS PREVIOUSLY BEEN SUBJECTED TO AN ANNEALING TREATMENT AT A TEMPERATURE BETWEEN 950*C. AND 1220*C. IS ANNEALED AT A TEMPERATURE IN THE RANGE FROM 450*C. TO 600*C. AND RAPIDLY COOLED THEREAFTER TO IMPROVE THE INITIAL PERMEABILITY, THEN THE ALLOY STRIP IS SUBJECTED TO A FINAL TEMPERING ANNEAL AT A TEMPERATURE IN THE RANGE FROM 250*C. TO 400*C. WHICH IS PREFERABLY CONDUCTED IN A TRANSVERSE MAGNETIC DIELD STO IMPROVE INDUCTION RISE, $B.
Inventors
- 👤 Friedrich Pfeifer
- 👤 Rudolf Deller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:19
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10; C22C; C22C19/00; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14708; H01F1/14716
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |