US3574114A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fine grain ceramic ferrites
Assignee: AT&T Inc
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Filing: 1968-08-05
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Granted: 1971-04-06
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Expires: 1988-08-05
Abstract
Abstract THE INCORPORATION OF CRITICAL AMOUNTS OF MAGNESIUM SULFATE AS A STARTING INGREDIENT RESULTS IN CONTROLLED UNIFORM FINE GRAIN SIZE IN A VARIETY OF CERAMIC MATERIALS PRODUCED BY OTHERWISE CONVENTIONAL CALCINING AND FIRING. CONCERNED COMPOSITIONS INCLUDED MAGNETIC FERRITES OF A TYPE NOT ORDINARILY CONTAINING MAGNESIUM.
Inventors
- 👤 Frank R Monforte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:57
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/0302; H01F1/0311; H01F1/0313; C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; H01F1/0009; Y; Y10; Y10S; Y10S264/00; Y10S264/58
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |