US2808371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonate purification
Assignee: Columbia Southern Chemical Corp
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Filing: 1954-04-29
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Granted: 1957-10-01
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Expires: 1974-04-29
Abstract
No abstract record available.
Inventors
- 👤 Henry C Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:24
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/08; C07C69/00; C07C69/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
29 words
THE PROCESS OF TREATING A CARBONATE ESTER CONTAMINATED WITH A HALOFORMATE HALOGEN WHICH COMPRISES CONTACTING THE COBTAMINATED CARBONATE ESTERR WITH A TERTIARY AMINE AND THEREAFTER RECOVERING THE CARBON EATER.
Claim 2
Dependent Claim
29 words
THE PROCESS OF TREATING A CARBONATE ESTER CONTAMINATED WITH A HALOFORMATE HALOGEN WHICH COMPRISES CONTACTING THE COBTAMINATED CARBONATE ESTERR WITH A TERTIARY AMINE AND THEREAFTER RECOVERING THE CARBON EATER.
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) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |