Patent US2903429A successfully refreshed from Google Patents.
US2903429A
Expired / Lapsed
US
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Modified ferrites
Assignee: Centre National de la Recherche Scientifique
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Filing: 1955-07-08
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Granted: 1959-09-08
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Expires: 1975-07-08
Abstract
No abstract record available.
Inventors
- 👤 Guillaud Charles Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2633; C04B35/2658
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
68 words
A FERRITE OF THE MANGANESE-ZINC TYPE OF HIGH PERMEABILITY AND LOW LOSSES, HAVING A COERCIVE FORCE LESS THAN 0.5 OERSTED AND COMPRISING IN MOLECULAR PROPORTIONS 49.7 TO 50.6% FE2O3, 24 TO 39% MNO, .3 TO 7.5% FEO, 3.9 TO 26% ZN0, AND A PROPORTION BY WEIGHT OF CALCIUM BETWEEN .01 AND 1% LOCATED SUBSTANTIALLY IN THE GRAIN BOUNDARIES, AND THE GRAIN DIMENSIONS BEING BETWEEN 5 AND 20 MICRONS.
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) | 1962-09-07 | 1963-03-09 | 1963-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-07 | 1967-03-09 | 1967-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-07 | 1971-03-09 | 1971-09-08 | $7700.00 | Window Closed / Lapsed |