US2951810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferrite
Assignee: Individual
•
Filing: 1958-02-06
•
Granted: 1960-09-06
•
Expires: 1978-02-06
Abstract
No abstract record available.
Inventors
- 👤 Kikuchi Yoshimitsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2666
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
95 words
A FERRITE FORMED BY A PRELIMINARY SINTERING OF A PULVERIZED MIXTURE OF .5 TO 65 MOL-PERCENT COPPER OXIDE, .1 TO 68 MOL-PERCENT OF NICKEL OXIDE, .1 TO 20 MOL-PERCENT OF COLBALT OXIDE, AND 30 TO 60 MOL-PERCENT OF FERRIC OXIDE AT A TEMPERATURE OF FROM 800* TO 1200*C. FOR FROM ONE TO THREE HOURS, SAID MIXTURE THEN BEING REPULVERIZED TO A POWDER, MOLDED INTO A DESIRED SHAPED BLOCK, SINTERED AT 1000* TO 1400*C. FOR ONE-HALF TO THREE HOURS IN AIR, AND COOLED AT A RATE OF FROM 5* TO 15*C. PER MINUTE TO AMBIENT TEMPERATURE.
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) | 1963-09-06 | 1964-03-07 | 1964-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-06 | 1968-03-07 | 1968-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-06 | 1972-03-07 | 1972-09-06 | $7700.00 | Window Closed / Lapsed |