Patent US3740335A successfully refreshed from Google Patents.
US3740335A
Expired / Lapsed
US
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Ferrimagnetic ceramics
Assignee: OI Glass Inc
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Filing: 1971-08-12
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Granted: 1973-06-19
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Expires: 1991-08-12
Abstract
Abstract FERRIMAGNETIC CERAMIC COMPOSITIONS BASED ON THE TERNARY OXIDE SYSTEM, FE2O3-LI2O-SIO2. WHEREIN THE PREDOMINANT CRYSTALLINE PHASE IS LITHIUM FERRITE (LIFE5O8). MINOR AMOUNTS OF NUCLEATING AGENTS, SUCH AS ZNO, CAN ALSO BE ADDED TO THE BASIC TERNARY SYSTEM TO FURTHER ENHANCE THE DEVELOPMENT AND GROWTH OF FERRITE CRYSTALS, THE CERAMIC BODIES PREPARED FROM THE ABOVE OXIDE SYSTEMS, ACCORDING TO THE SINTERING METHOD OF THIS INVENTION, HAVE RAPID SWITCHING TIMES AND SQUARENESS RATIOS WHICH MAKE HIGHLY FAVORABLE MATERIALS FOR THE MANUFACTURE OF COMPUTER MEMORY CORES, RADIO COILS, PULSE TRANSFORMERS AND OTHER ASSORTED ELECTRONIC DEVICES DESIGNED TO OPERATE AT MICROWAVE FREQUENCIES.
Inventors
- 👤 E Weaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:45
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |