US2881209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of phenylmalonic acid
Assignee: Millennium Petrochemicals Inc
•
Filing: 1954-06-11
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Granted: 1959-04-07
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Expires: 1974-06-11
Abstract
No abstract record available.
Inventors
- 👤 John F Nobis
- 👤 Louis F Moormeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:19
CPC Classifications
C; C07; C07F; C07F1/00; C07F1/04; C07C; C07C51/00; C07C51/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN A PROCESS IN WHICH THE SODIUM SALT OF PHENYLMALONIC ACID IS PREPARED BY CARBONATION OF BENZYL SODIUM, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF REACTING FINELY DISPERSED SODIUM HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 25 MICRONS AND CHLOROBENZENE IN A REACTION MEDIUM CONSISTING SOLELY OF TOLUENE AT A TEMPERATURE OF ABOUT 0* TO 40* C,. REFLUXING THE TOTAL REACTION MIXTURE TO PRODUCE BENZYL SODIUM, AND IMMEDIATELY THERAFTER CONTACTING THE MIXTURE WITH GASEOUS CARBON DIOXIDE AT A TEMPERATURE OF ABOUT 30* TO 60* C. IN AN AMOUNT SUBSTANTIALLY LESS THAN THEORETICALLY REQUIRED TO CARBONATE ALL OF THE BENZYL SODIUM IN SAID MIXTURE, AND THEN CONTACTING THE RESULTING PARTIALLY CARBONATED MIXTURE WITH AN AMOUNT OF CARBON DIOXIDE SUFFICIENT TO PRODUCE A CARBONATED MIXTURE COMPRISING A MAJOR PROPORTION OF THE DISODIUM SALT OF PHENYLMALONIC ACID AND A MINOT PROPORTION OF THE SODIUM SALT OF PHENYLACETIC ACID.
Claim 2
Dependent Claim
146 words
IN A PROCESS IN WHICH THE SODIUM SALT OF PHENYLMALONIC ACID IS PREPARED BY CARBONATION OF BENZYL SODIUM, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF REACTING FINELY DISPERSED SODIUM HAVING AN AVERAGE PARTICLE SIZE OF LESS THAN 25 MICRONS AND CHLOROBENZENE IN A REACTION MEDIUM CONSISTING SOLELY OF TOLUENE AT A TEMPERATURE OF ABOUT 0* TO 40* C,. REFLUXING THE TOTAL REACTION MIXTURE TO PRODUCE BENZYL SODIUM, AND IMMEDIATELY THERAFTER CONTACTING THE MIXTURE WITH GASEOUS CARBON DIOXIDE AT A TEMPERATURE OF ABOUT 30* TO 60* C. IN AN AMOUNT SUBSTANTIALLY LESS THAN THEORETICALLY REQUIRED TO CARBONATE ALL OF THE BENZYL SODIUM IN SAID MIXTURE, AND THEN CONTACTING THE RESULTING PARTIALLY CARBONATED MIXTURE WITH AN AMOUNT OF CARBON DIOXIDE SUFFICIENT TO PRODUCE A CARBONATED MIXTURE COMPRISING A MAJOR PROPORTION OF THE DISODIUM SALT OF PHENYLMALONIC ACID AND A MINOT PROPORTION OF THE SODIUM SALT OF PHENYLACETIC ACID.
References Cited (Backward Citations)
US1974917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |