Patent US2787631A successfully refreshed from Google Patents.
US2787631A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonate preparation
Assignee: Columbia Southern Chemical Corp
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Filing: 1954-05-05
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Granted: 1957-04-02
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Expires: 1974-05-05
Abstract
No abstract record available.
Inventors
- 👤 Henry C Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:21
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/96; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD OF PREPARING A DIESTER OF CARBONIC ACID BY REACTION OF A CARBONYL HALIDE AND AN ALCOHOL WHICH COMPRISES CONDUCTING THE REACTION IN A LIQUID MEDIUM OF A HALOFORNATE CONTAINING THE REACTANTS IN ESSENTIALLY THE STOICHIOMETRIC PROPORTIONS NECESSARY FOR FORMATION OF THE DIESTER AND DURING THE LATTER PORTION OF THE REACTION MAINTAINING THE MEDIUM AT APPROXIMATELY THE BOILING TEMPERATURE OF THE HALOFORMATE.
Claim 2
Independent Claim
63 words
A METHOD OF PREPARING A DIESTER OF CARBONIC ACID BY REACTION OF A CARBONYL HALIDE AND AN ALCOHOL WHICH COMPRISES CONDUCTING THE REACTION IN A LIQUID MEDIUM OF A HALOFORNATE CONTAINING THE REACTANTS IN ESSENTIALLY THE STOICHIOMETRIC PROPORTIONS NECESSARY FOR FORMATION OF THE DIESTER AND DURING THE LATTER PORTION OF THE REACTION MAINTAINING THE MEDIUM AT APPROXIMATELY THE BOILING TEMPERATURE OF THE HALOFORMATE.
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) | 1960-04-01 | 1960-10-01 | 1961-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-01 | 1964-10-01 | 1965-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-01 | 1968-10-01 | 1969-04-02 | $7700.00 | Window Closed / Lapsed |