Patent US3387918A successfully refreshed from Google Patents.
US3387918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of metallic ferrites
Assignee: Chicago Copper and Chemical Co
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Filing: 1964-11-13
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Granted: 1968-06-11
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Expires: 1984-11-13
Abstract
No abstract record available.
Inventors
- 👤 Marvin D Moore
- 👤 Robert K Birks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:36
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A METHOD OF INCREASING THE RESIDUAL MAGNETIC INDUCTION OF A METALLIC FERRITE OF THE FORMULA MO.6FE2O3 WHEREIN M REPRESENTS BARIUM, STRONTIUM OR LEAD WHICH COMPRISES TREATING SAID METALLIC FERRITE WITH AN AQUEOUS ACID SOLUTION HAVING A PH NOT GREATER THAN 5 AT A TEMPERATURE IN THE RANGE FROM 20* TO 110*C.
Claim 2
Independent Claim
51 words
A METHOD OF INCREASING THE RESIDUAL MAGNETIC INDUCTION OF A METALLIC FERRITE OF THE FORMULA MO.6FE2O3 WHEREIN M REPRESENTS BARIUM, STRONTIUM OR LEAD WHICH COMPRISES TREATING SAID METALLIC FERRITE WITH AN AQUEOUS ACID SOLUTION HAVING A PH NOT GREATER THAN 5 AT A TEMPERATURE IN THE RANGE FROM 20* TO 110*C.
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) | 1971-06-11 | 1971-12-11 | 1972-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-11 | 1975-12-11 | 1976-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-11 | 1979-12-11 | 1980-06-11 | $7700.00 | Window Closed / Lapsed |