US3017424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of diarylcarbonates
Assignee: Bayer AG
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Filing: 1958-03-25
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Granted: 1962-01-16
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Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Meyer Karl-Heinrich
- 👤 Schnell Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:04
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/44; C07D317/46; C07C; C07C68/00; C07C68/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
IN A PROCESS FOR THE PRODUCTION OF DIARYLCARBONATES BY REACTING PHOSGENE WITH AN AQUEOUS SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL AND ALKALINE EARTH METAL PHENOXIDES AND NAPHATHOXIDES, THE IMPROVEMENT OF CARRYING OUT THE REACTION IN A HIGHLY DISPERSED TWO-PHASE SYSTEM IN WHICH THE AQUEOUS SOLUTION FORMS ONE PHASE AND A SOLUTION OF PHOSGENE IN A CHLORINATED ALIPHATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF METHYLENE CHLORIDE, ETHYLENE CHLORIDE, CHLOROFROM, CARBON TETRACHLORIDE AND TETRACHLOROETHANE, FORMS THE SECOND PHASE.
Claim 2
Dependent Claim
84 words
IN A PROCESS FOR THE PRODUCTION OF DIARYLCARBONATES BY REACTING PHOSGENE WITH AN AQUEOUS SOLUTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE ALKALI METAL AND ALKALINE EARTH METAL PHENOXIDES AND NAPHATHOXIDES, THE IMPROVEMENT OF CARRYING OUT THE REACTION IN A HIGHLY DISPERSED TWO-PHASE SYSTEM IN WHICH THE AQUEOUS SOLUTION FORMS ONE PHASE AND A SOLUTION OF PHOSGENE IN A CHLORINATED ALIPHATIC HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF METHYLENE CHLORIDE, ETHYLENE CHLORIDE, CHLOROFROM, CARBON TETRACHLORIDE AND TETRACHLOROETHANE, FORMS THE SECOND PHASE.
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) | 1965-01-15 | 1965-07-17 | 1966-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-15 | 1969-07-17 | 1970-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-15 | 1973-07-17 | 1974-01-16 | $7700.00 | Window Closed / Lapsed |