Patent US2945744A successfully refreshed from Google Patents.
US2945744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic materials
Assignee: AT&T Inc
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Filing: 1958-02-14
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Granted: 1960-07-19
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Expires: 1978-02-14
Abstract
No abstract record available.
Inventors
- 👤 Knox Kerro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:28
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A CLASS OF FERRIMAGNETIC MATERIALS HAVING THE FORMULA NA5X3F14, WHEREIN X IS A TRIVALENT METALLIC ION
Claim 2
Dependent Claim
16 words
A CLASS OF FERRIMAGNETIC MATERIALS HAVING THE FORMULA NA5X3F14, WHEREIN X IS A TRIVALENT METALLIC ION
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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |