Patent DE532830C successfully refreshed from Google Patents.
US3583918A
Expired / Lapsed
US
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Lithium copper manganese ferrite storage core material
Assignee: International Business Machines Corp
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Filing: 1968-05-14
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Granted: 1971-06-08
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Expires: 1988-05-14
Abstract
Abstract A FAST SWITCHING, SQUARE LOOP, TEMPERATURE STABLE, FERRITE CORE, SUITABLE FOR COMPUTER APPLICATIONS IS PROVIDED. THE COMPOSITION CONSISTS OF THE OXIDES OR CARBONATES OR THE LIKE OF LITHIUM, COPPER, MANGANESE AND IRON IN PREDETERMINED PROPORTIONS. THE COMPONENTS ARE MIXED SHAPED, FIRED AND QUENCHED TO OBTAIN THE STORAGE CORE OF THE DESIRED PROPERTIES.
Inventors
- 👤 Robert C Turnbull
- 👤 Reynier W Dam
- 👤 Derry J Dubetsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2616
Claims Analysis
Total Claims: 0
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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) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |