US2802723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sodium carbide
Assignee: EIDP Inc
•
Filing: 1953-10-23
•
Granted: 1957-08-13
•
Expires: 1973-10-23
Abstract
No abstract record available.
Inventors
- 👤 Charles H Lemke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:11
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/935; C01P; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
THE METHOD OF FORMING SODIUM CARBIDE WHICH COMPRISES REACTING A MIXTURE CONTAINING FREE SODIUM HYDROXIDE AND FREE CARBON AT A TEMPERATURE OF AROUND 700*-900* C., SAID FREE CARBON BEING IN EXCESS OF THE STOICHIOMETRIC REQUIREMENT FOR THE FORMATION OF SAID CARBIDE FROM SAID SODIUM HYDROXIDE.
Claim 2
Independent Claim
45 words
THE METHOD OF FORMING SODIUM CARBIDE WHICH COMPRISES REACTING A MIXTURE CONTAINING FREE SODIUM HYDROXIDE AND FREE CARBON AT A TEMPERATURE OF AROUND 700*-900* C., SAID FREE CARBON BEING IN EXCESS OF THE STOICHIOMETRIC REQUIREMENT FOR THE FORMATION OF SAID CARBIDE FROM SAID SODIUM HYDROXIDE.
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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |