US3615367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-loss magnetic core of ferritic structure containing chromium
Assignee: Armco Inc
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Filing: 1968-07-31
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Granted: 1971-10-26
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Expires: 1988-07-31
Abstract
Abstract Corrosion-resistant magnetic core of low hysteresis loss and low eddy-current loss and alloy containing about 9% to 20% chromium, about 0.01% to 3% silicon and/or aluminum, manganese up to about 4%, carbon up to about 0.15%, about 0.15% to 1% sulfur and/or selenium, about 0.02% to 1% titanium and/or zirconium, and remainder substantially iron.
Inventors
- 👤 Harry Tanczyn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60; C22C38/18; C22C38/28; C22C38/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
63 words
Magnetic core of ferritic structure and desired resistivity and permeability for solenoid, relay or other electrical machinery apparatus and equipment, said core essentially consisting of about 12 to about 18% chromium, about 0.5 to about 2% silicon, up to about 4% manganese, carbon less than 0.06%, about 0.15 to about 0.50% sulfur about 0.1 to about 0.6% titanium, and remainder substantially all iron.
Claim 2
Dependent Claim
60 words
Magnetic core of ferritic structure and desired resistivity and permeability for solenoid, relay or other electrical machinery, apparatus and equipment, said core essentially consisting of about 12 to about 18% chromium, about 0.5 to about 2% silicon, about 0.01 to about 0.04% carbon, about 0.15 to about 0.50% sulfur about 0.1 to about 0.6% titanium, and remainder substantially all iron.
Claim 3
Dependent Claim
59 words
Alloy steel core of ferritic structure and desired resistivity and permeability for solenoid relay or other electrical machinery, apparatus and equipment, said core essentially consisting of about 12 to about 18% chromium, about 0.50 to about 3% silicon, carbon less than 0.06%, about 0.15 to about 0.50% selenium, about 0.1 to about 0.6% titanium, and remainder substantially all iron.
Claim 4
Dependent Claim
58 words
Alloy steel core of ferritic structure and desired resistivity and permeability for solenoid, relay or other electrical machinery, apparatus and equipment, said core essentially consisting of about14 to about 16% chromium, about 1 to about 3% silicon, carbon not exceeding 0.04%, about 0.15 to about 0.50% selenium, about 0.1 to about 0.6% titanium, and remainder substantially all iron.
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 |