Patent US3239817A successfully refreshed from Google Patents.
US2876074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical process
Assignee: Columbia Southern Chemical Corp
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Filing: 1957-09-06
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Granted: 1959-03-03
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Expires: 1977-09-06
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:52
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1218; C22B34/1227; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD OF BENEFICIATING A TITATIUM BEARING SLAG WHICH CONTAINS TITANIUM IN A TETRAVALENT STATE, TITANIUM IN A VALENT STATE BELOW THE TETRAVALENT STATE AND IRON AND ALKALINE EARTH METAL OXIDE IMPURITIES WHICH COMPRISES OXIDIZING THE SLAG TO EFFECT SUBSTANTIALLY COMPLETE CONVERSION OF THE TITANIUM TO TETRAVALENT STATE, HOLDING THE OXIDIZED SLAG AT A TEMPERATURE AT WHICH TITANIUM DIOXIDE RUTILE CRYSTALS AR FORMED FOR A TIME TO PERMIT GROWTH OF SUCH CRYSTALS THUS SEPARATING RUTILE FROM SIAD IMPURITIES, ALLOWING THE SLAG CONTAINING THE TITANIUM DIOXIDE RUTILE CRYSTALS TO COOL THEREBY PRODUCING A MIXTURE OF SAID CRYSTALS AND IMPURITIES, AND SUBSEQUENTLY SEPARATING IMPURITY FROM SUCH CRYSTLS.
Claim 2
Independent Claim
105 words
A METHOD OF BENEFICIATING A TITATIUM BEARING SLAG WHICH CONTAINS TITANIUM IN A TETRAVALENT STATE, TITANIUM IN A VALENT STATE BELOW THE TETRAVALENT STATE AND IRON AND ALKALINE EARTH METAL OXIDE IMPURITIES WHICH COMPRISES OXIDIZING THE SLAG TO EFFECT SUBSTANTIALLY COMPLETE CONVERSION OF THE TITANIUM TO TETRAVALENT STATE, HOLDING THE OXIDIZED SLAG AT A TEMPERATURE AT WHICH TITANIUM DIOXIDE RUTILE CRYSTALS AR FORMED FOR A TIME TO PERMIT GROWTH OF SUCH CRYSTALS THUS SEPARATING RUTILE FROM SIAD IMPURITIES, ALLOWING THE SLAG CONTAINING THE TITANIUM DIOXIDE RUTILE CRYSTALS TO COOL THEREBY PRODUCING A MIXTURE OF SAID CRYSTALS AND IMPURITIES, AND SUBSEQUENTLY SEPARATING IMPURITY FROM SUCH CRYSTLS.
References Cited (Backward Citations)
US2798048A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |