US2496091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the preparation of phenyl chloroformate
Assignee: U S Ind Chemicals Inc
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Filing: 1947-04-26
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Granted: 1950-01-31
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Expires: 1967-04-26
Abstract
No abstract record available.
Inventors
- 👤 John A S Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:01
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE METHOD FOR THE PREPARATION OF PHENYL CHLOROFORMATE WHICH COMPRISES ADDING TO A SOLUTION OF PHOSGENE IN AT LEAST ONE SOLVENT SLECTED FROM THE GROUP CONSISTING OF PENTANE, HEXANE, HEPTANE, BENZENE, TOLUENE AND XYLENE, A SLURRY CONTAINING ANHYDROUS SODIUM PHENOLATE IN AT LEAST ONE MATERIAL SLECTED FROM THE GROUP CONSISTING OF PENTANE, HEXANE, HEPTANE, BENZENE, TOLUENE AND XYLENE AND MAINTAINING THE TEMPERATURE AT A RANGE FROM -35*C. TO +15*C. FOR A LENGTH OF TIME SUFFICIENT FOR THE SODIUM PHENOLATE TO REACT WITH THE PHENYL CHLOROFORMATE.
Claim 2
Independent Claim
85 words
THE METHOD FOR THE PREPARATION OF PHENYL CHLOROFORMATE WHICH COMPRISES ADDING TO A SOLUTION OF PHOSGENE IN AT LEAST ONE SOLVENT SLECTED FROM THE GROUP CONSISTING OF PENTANE, HEXANE, HEPTANE, BENZENE, TOLUENE AND XYLENE, A SLURRY CONTAINING ANHYDROUS SODIUM PHENOLATE IN AT LEAST ONE MATERIAL SLECTED FROM THE GROUP CONSISTING OF PENTANE, HEXANE, HEPTANE, BENZENE, TOLUENE AND XYLENE AND MAINTAINING THE TEMPERATURE AT A RANGE FROM -35*C. TO +15*C. FOR A LENGTH OF TIME SUFFICIENT FOR THE SODIUM PHENOLATE TO REACT WITH THE PHENYL CHLOROFORMATE.
References Cited (Backward Citations)
US2193336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |