Patent US2646608A successfully refreshed from Google Patents.
US2646608A
Expired / Lapsed
US
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Process of manufacturing a magnetic material
Assignee: Hartford National Bank and Trust Co
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Filing: 1946-04-08
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Granted: 1953-07-28
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Expires: 1966-04-08
Abstract
No abstract record available.
Inventors
- 👤 Boeke Jan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:44
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265; C01; C01G; C01G49/00; C01G49/02; C01G49/06; Y; Y10; Y10S; Y10S264/00; Y10S264/25; Y10S264/58
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
THE METHOD OF MANUFACTURING MAGNETIC MATERIAL, COMPRISING THE STEPS OF TREATING FERRIC CHLORIDE WITH AMMONIUM HYDROXIDE, PRECIPITATING FERRIC OXY-HYDRATE INTO ACTIVE FERRIC OXIDE, SAID FERRIC OXY-HYDRATE INTO ACTIVE FERRIC OXIDE, MIXING SAID ACTIVE FERRIC OXIDE WITH PURE COPPER OXIDE AND PURE ZINC OXIDE, SINTERING THE MIXTURE THUS OBTAINED AT TEMPERATURE OF ABOUT 950* FOR ABOUT THREE HOURS, SLOWLY COOLING SAID HEATED MIXTURE TO APPROXIMATELY 725* C., MAINTAINING SAID SINTERED MIXTURE FOR APPROXIMATELY 24 HOURS AT A TEMPERATURE OF 725* C., AND SLOWLY COOLING THE SINTERED MIXTURE TO THE AMBIENT TEMPERATURE
Claim 2
Independent Claim
90 words
THE METHOD OF MANUFACTURING MAGNETIC MATERIAL, COMPRISING THE STEPS OF TREATING FERRIC CHLORIDE WITH AMMONIUM HYDROXIDE, PRECIPITATING FERRIC OXY-HYDRATE INTO ACTIVE FERRIC OXIDE, SAID FERRIC OXY-HYDRATE INTO ACTIVE FERRIC OXIDE, MIXING SAID ACTIVE FERRIC OXIDE WITH PURE COPPER OXIDE AND PURE ZINC OXIDE, SINTERING THE MIXTURE THUS OBTAINED AT TEMPERATURE OF ABOUT 950* FOR ABOUT THREE HOURS, SLOWLY COOLING SAID HEATED MIXTURE TO APPROXIMATELY 725* C., MAINTAINING SAID SINTERED MIXTURE FOR APPROXIMATELY 24 HOURS AT A TEMPERATURE OF 725* C., AND SLOWLY COOLING THE SINTERED MIXTURE TO THE AMBIENT TEMPERATURE
References Cited (Backward Citations)
US1976230A
Cited
US1997193A
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US1946964A
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US2452529A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-27 | 1957-01-26 | 1957-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-27 | 1961-01-26 | 1961-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-27 | 1965-01-26 | 1965-07-28 | $7700.00 | Window Closed / Lapsed |