Patent US2712494A successfully refreshed from Google Patents.
US2712494A
Expired / Lapsed
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Preparation of phosphorus oxychloride
Assignee: Compagnie de Saint Gobain SA
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Filing: 1951-01-16
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Granted: 1955-07-05
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Expires: 1971-01-16
Abstract
No abstract record available.
Inventors
- 👤 Dupont Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:54
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD OF MAKING PHOSPHORUS OXYCHLORIDE THAT COMPRISES IMPREGNATING CHAROCAL WITH A SOLUTION OF ARTHOPHOSPHORIC ACID UNTIL THE P205 CORRESPONDS TO ABOUT 50% OF ACID UNTIL THE P2O5 CORRESPONDS TO ABOUT 50% CHARCOAL AT A TEMPERATURE ABOUT 500* C. TO A CUNSTITUTION APPROXIMATING MATAPHOSPHORIC ACID, PASSING CHLORINE GAS THROUGH THE IMPREGNATED CHARCOAL AT A TEMPERATURE BETWEEN ABOUT 300 AND ABOUT 700* C. WITH SUFFICIENT VELOCITY TO KEEP THE GRAINS IN AGITATION AT ALL TIMES, THEREBY COMPLETING THE REACTION WITHIN A PERIOD OF TIME OF THE ORDER OF SECONDS, AND RECOVERING THE PHOSPHROUS OXYCHLORIDE.
Claim 2
Independent Claim
93 words
A METHOD OF MAKING PHOSPHORUS OXYCHLORIDE THAT COMPRISES IMPREGNATING CHAROCAL WITH A SOLUTION OF ARTHOPHOSPHORIC ACID UNTIL THE P205 CORRESPONDS TO ABOUT 50% OF ACID UNTIL THE P2O5 CORRESPONDS TO ABOUT 50% CHARCOAL AT A TEMPERATURE ABOUT 500* C. TO A CUNSTITUTION APPROXIMATING MATAPHOSPHORIC ACID, PASSING CHLORINE GAS THROUGH THE IMPREGNATED CHARCOAL AT A TEMPERATURE BETWEEN ABOUT 300 AND ABOUT 700* C. WITH SUFFICIENT VELOCITY TO KEEP THE GRAINS IN AGITATION AT ALL TIMES, THEREBY COMPLETING THE REACTION WITHIN A PERIOD OF TIME OF THE ORDER OF SECONDS, AND RECOVERING THE PHOSPHROUS OXYCHLORIDE.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-04 | 1959-01-03 | 1959-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-04 | 1963-01-03 | 1963-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-04 | 1967-01-03 | 1967-07-05 | $7700.00 | Window Closed / Lapsed |