Patent US2734034A successfully refreshed from Google Patents.
US2734034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic compositions
Assignee: —
•
Filing: —
•
Granted: 1956-02-07
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Expires: 1973-02-07
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; C04B35/2625; C04B35/2616
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
THE METHOD OF PREPARAING MAGNETIC ARTICLES HAVING USEFUL MAGNETIC AND ELECTRICAL PROPERTIES WHICH COMPRISES HEAT-TREATING AT A TEMPERATURE OF 800* TO 1200* C. AN INITIAL OXIDE MIXTURE CONTAINING BY WEIGHT FROM 50 TO 90% FERRIC OXIDE, 12 TO 22% ZINC OXIDE, 1 TO 10% MAGNESIUM OXIDE AND 1 TO 6% LITHIUM CARBONATE UNDER NONOXIDIZING CONDITIONS, GRINDING THE RESULTING PRODUCT TO A FINE PARTICLE SIZE, COMPACTING THE RESULTING GROUND PRODUCT INTO A SHAPED ARTICLE OF THE SHAPE AND SIZE PREDETERMINED BY THE SHAPE AND SIDE OF THE FINAL ARTICLE, HEATTREATING THE SHAPED ARTICLE AT A HIGHER TEMPERATURE WITHIN THE RANGE OF 1100* TO 1450* C. UNDER NON-OXIDIZING CONDITIONS, THE NON-OXIDIZING CONDITIONS OF AT LEAST ONE OF SAID HEAT-TREATMENTS BEING REDUCING TO INSURE THE PRESENCE OF FERROUS OXIDE IN THE SHAPED ARTICLE AT THE CONCLUSION OF THE SECOND HEAT-TREATMENT, AND GRADUALLY COOLING THE HEATTREATED ARTICLE THROUGH AT LEAST THE GREATER PART OF THE TEMPERATURE RANGE OF 1000* TO 300* C. IN ORDER TO EFFECT SPONTANEOUS DISSOCIATION OF THE FERROUS OXIDE TO FORM CRYPTO-CRYSTALLINE METALLIC IRON.
Claim 2
Independent Claim
173 words
THE METHOD OF PREPARAING MAGNETIC ARTICLES HAVING USEFUL MAGNETIC AND ELECTRICAL PROPERTIES WHICH COMPRISES HEAT-TREATING AT A TEMPERATURE OF 800* TO 1200* C. AN INITIAL OXIDE MIXTURE CONTAINING BY WEIGHT FROM 50 TO 90% FERRIC OXIDE, 12 TO 22% ZINC OXIDE, 1 TO 10% MAGNESIUM OXIDE AND 1 TO 6% LITHIUM CARBONATE UNDER NONOXIDIZING CONDITIONS, GRINDING THE RESULTING PRODUCT TO A FINE PARTICLE SIZE, COMPACTING THE RESULTING GROUND PRODUCT INTO A SHAPED ARTICLE OF THE SHAPE AND SIZE PREDETERMINED BY THE SHAPE AND SIDE OF THE FINAL ARTICLE, HEATTREATING THE SHAPED ARTICLE AT A HIGHER TEMPERATURE WITHIN THE RANGE OF 1100* TO 1450* C. UNDER NON-OXIDIZING CONDITIONS, THE NON-OXIDIZING CONDITIONS OF AT LEAST ONE OF SAID HEAT-TREATMENTS BEING REDUCING TO INSURE THE PRESENCE OF FERROUS OXIDE IN THE SHAPED ARTICLE AT THE CONCLUSION OF THE SECOND HEAT-TREATMENT, AND GRADUALLY COOLING THE HEATTREATED ARTICLE THROUGH AT LEAST THE GREATER PART OF THE TEMPERATURE RANGE OF 1000* TO 300* C. IN ORDER TO EFFECT SPONTANEOUS DISSOCIATION OF THE FERROUS OXIDE TO FORM CRYPTO-CRYSTALLINE METALLIC IRON.
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) | 1959-02-06 | 1959-08-08 | 1960-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-06 | 1963-08-08 | 1964-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-06 | 1967-08-08 | 1968-02-07 | $7700.00 | Window Closed / Lapsed |