US3093588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithium ferrites
Assignee: Ampex Corp
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Filing: 1960-04-04
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Granted: 1963-06-11
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Expires: 1980-04-04
Abstract
No abstract record available.
Inventors
- 👤 Daniel L Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2616
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A METHOD OF MAKING SQUARE HYSTERESIS LOOP LITHIUM FERRITE MAGNETIC MATERIAL WHEREIN THE MAGNETIC MATERIAL IS SINTERED, THE IMPROVEMENT COMPRISING DURING SINTERING SUPPORTING SAID LITHIUM FERRITE MATERIAL WITH OTHER LITHIUM FERRITE MATERIAL OF SUBSTANTIALLY THE SAME COMPOSITION, AND DURING SINTERING COVERING SAID LITHIUM FERRITE MATERIAL WITH A COVER OF LITHIUM FERRITE MATERIAL OF THE SAME COMPOSITION, SAID COVER BEING DURING SPACED FROM SAID MATERIAL AND TOGETHER WITH SAID BASE DURING THE SINTERING TEMPERATURES INSURES THAT THE SPACE BETWEEN SAID MATERIAL AND SAID COVER CONTAINS AN EXCESS OF EVAPORATED LITHIUM.
Claim 2
Dependent Claim
90 words
IN A METHOD OF MAKING SQUARE HYSTERESIS LOOP LITHIUM FERRITE MAGNETIC MATERIAL WHEREIN THE MAGNETIC MATERIAL IS SINTERED, THE IMPROVEMENT COMPRISING DURING SINTERING SUPPORTING SAID LITHIUM FERRITE MATERIAL WITH OTHER LITHIUM FERRITE MATERIAL OF SUBSTANTIALLY THE SAME COMPOSITION, AND DURING SINTERING COVERING SAID LITHIUM FERRITE MATERIAL WITH A COVER OF LITHIUM FERRITE MATERIAL OF THE SAME COMPOSITION, SAID COVER BEING DURING SPACED FROM SAID MATERIAL AND TOGETHER WITH SAID BASE DURING THE SINTERING TEMPERATURES INSURES THAT THE SPACE BETWEEN SAID MATERIAL AND SAID COVER CONTAINS AN EXCESS OF EVAPORATED LITHIUM.
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) | 1966-06-10 | 1966-12-10 | 1967-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-06-10 | 1970-12-10 | 1971-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-06-10 | 1974-12-10 | 1975-06-11 | $7700.00 | Window Closed / Lapsed |