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US2805240A
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Manufacture of aryl phosphates
Assignee: Individual
•
Filing: 1953-10-29
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Granted: 1957-09-03
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Expires: 1973-10-29
Abstract
No abstract record available.
Inventors
- 👤 Walter H Prahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:24
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A PROCESS FOR PRODUCING A TRI-ARYL ESTER OF ORTHOPHOSPHORIC ACID WHICH COMPRISES THE STEPS OF HEATING A LIQUID MIXTURE COMPRISING A DI-ARYL ESTER OF ORTHO-PHOSPHORIC ACID AND A HYDROXYARYL COMPOUND TO A REACTION TEMPERATURE OF FROM ABOUT 115*C. TO ABOUT 300*C. REMOVING WATER FROM THE LIQUID REACTION MIXTURE BY INTERNALLY CONTACTING THE LIQUID REACTION MIXTURE WITH VAPORS OF HYDROXYARYL COMPOUND FORMED FROM SUBSTANTIALLY ANHYDROUS HYDROXYARYL COMPOUND, THE WATER REMOVAL MAINTAINING THE WATER CONTENT OF THE REACTION MIXTURE BELOW THE EQUILIBRIUM CONCENTRATION OF WATER IN THE REACTION MIXTURE, CONTINUING SAID WATER REMOVAL TO BRING THE PROPORTION OF WATER IN THE VAPORS EMERGING FROM THE REACTION MIXSTURE DOWN TO A VALUE BELOW 0.1% BY WEIGHT AND RECOVERING TRI-ARYL ESTER BY MEANS OF DISTILLATION.
Claim 2
Dependent Claim
121 words
A PROCESS FOR PRODUCING A TRI-ARYL ESTER OF ORTHOPHOSPHORIC ACID WHICH COMPRISES THE STEPS OF HEATING A LIQUID MIXTURE COMPRISING A DI-ARYL ESTER OF ORTHO-PHOSPHORIC ACID AND A HYDROXYARYL COMPOUND TO A REACTION TEMPERATURE OF FROM ABOUT 115*C. TO ABOUT 300*C. REMOVING WATER FROM THE LIQUID REACTION MIXTURE BY INTERNALLY CONTACTING THE LIQUID REACTION MIXTURE WITH VAPORS OF HYDROXYARYL COMPOUND FORMED FROM SUBSTANTIALLY ANHYDROUS HYDROXYARYL COMPOUND, THE WATER REMOVAL MAINTAINING THE WATER CONTENT OF THE REACTION MIXTURE BELOW THE EQUILIBRIUM CONCENTRATION OF WATER IN THE REACTION MIXTURE, CONTINUING SAID WATER REMOVAL TO BRING THE PROPORTION OF WATER IN THE VAPORS EMERGING FROM THE REACTION MIXSTURE DOWN TO A VALUE BELOW 0.1% BY WEIGHT AND RECOVERING TRI-ARYL ESTER BY MEANS OF DISTILLATION.
References Cited (Backward Citations)
US1869312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |