US2691575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Converting lead oxide to lead
Assignee: EIDP Inc
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Filing: 1951-09-06
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Granted: 1954-10-12
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Expires: 1971-09-06
Abstract
No abstract record available.
Inventors
- 👤 Lester L Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
C; C22; C22B; C22B13/00; C22B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
THE PROCESS WHICH COMPRISES HEATING A FLUID MIXTURE CONSISTING ESSENTIALLY OF LEAD OXIDE AND FROM ABOUT 50% TO ABOUT 200% BY WEIGHT OF SODIUM HYDROXIDE BASED ON THE LEAD OXIDE AT A TEMPERATURE OF FROM 327* C. TO ABOUT 450* C., MIXING WITH SUCH MIXTURE FROM ABOUT 10% TO ABOUT 30% BY WEIGHT OF METALLIC SODIUM BASED ON THE LEAD OXIDE, AND SEPARATING MOLTEN LEAD FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
69 words
THE PROCESS WHICH COMPRISES HEATING A FLUID MIXTURE CONSISTING ESSENTIALLY OF LEAD OXIDE AND FROM ABOUT 50% TO ABOUT 200% BY WEIGHT OF SODIUM HYDROXIDE BASED ON THE LEAD OXIDE AT A TEMPERATURE OF FROM 327* C. TO ABOUT 450* C., MIXING WITH SUCH MIXTURE FROM ABOUT 10% TO ABOUT 30% BY WEIGHT OF METALLIC SODIUM BASED ON THE LEAD OXIDE, AND SEPARATING MOLTEN LEAD FROM THE REACTION MIXTURE.
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) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |