Patent US2723239A successfully refreshed from Google Patents.
US2723239A
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Ferrospinel compositions
Assignee: RCA Corp
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Filing: 1952-09-29
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Granted: 1955-11-08
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Expires: 1972-09-29
Abstract
No abstract record available.
Inventors
- 👤 Robert L Harvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF THE REACTION PRODUCT FORMED BY HEATING AN INTIMATE MIXTURE OF 0.01 PERCENT TO 0.16 PERCENT BY WEIGHT CO3O4 AND THE MOLAR PROPORTIONS OF 0.15 TO 0.7 ZNO, 0.0 TO 0.5 MGO, 0.05 TO 0.9 NIO, 0.8 TO 1.0 FE2O3 FOR AT LEAST ONE HOUR AT 900* C. TO 1400* C. UNDER NON-REDUCING CONDITIONS.
Claim 2
Dependent Claim
60 words
A COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF THE REACTION PRODUCT FORMED BY HEATING AN INTIMATE MIXTURE OF 0.01 PERCENT TO 0.16 PERCENT BY WEIGHT CO3O4 AND THE MOLAR PROPORTIONS OF 0.15 TO 0.7 ZNO, 0.0 TO 0.5 MGO, 0.05 TO 0.9 NIO, 0.8 TO 1.0 FE2O3 FOR AT LEAST ONE HOUR AT 900* C. TO 1400* C. UNDER NON-REDUCING CONDITIONS.
References Cited (Backward Citations)
US2656319A
Cited
US2659698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |