US2983749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of benzyl carbonates
Assignee: Callery Chemical Co
•
Filing: 1958-11-10
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Granted: 1961-05-09
•
Expires: 1978-11-10
Abstract
No abstract record available.
Inventors
- 👤 James W Shepherd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:23
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06; C07C69/00; C07C69/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A METHOD OF PRODUCING DIBENZYL CARBONATE WHICH COMPRISES REACTING BENZYL CHLORIDE WITH SODIUM METHYL CARBONATE, USING A MOLAR RATIO OF BENSYL CHLORIDE TO SODIUM METHYL CARBONATE OF AT LEAST ABOUT 2 TO 1, IN THE PRESENCE OF A TERTIARY AMINE CATALYST, AND RECOVERING THE DIBENZYL CARBONATE THUS FORMED.
Claim 2
Independent Claim
48 words
A METHOD OF PRODUCING DIBENZYL CARBONATE WHICH COMPRISES REACTING BENZYL CHLORIDE WITH SODIUM METHYL CARBONATE, USING A MOLAR RATIO OF BENSYL CHLORIDE TO SODIUM METHYL CARBONATE OF AT LEAST ABOUT 2 TO 1, IN THE PRESENCE OF A TERTIARY AMINE CATALYST, AND RECOVERING THE DIBENZYL CARBONATE THUS FORMED.
References Cited (Backward Citations)
US2648678A
Cited
US2784201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |