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Patent US3230252A successfully refreshed from Google Patents.
US3230252A
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Synthesis of phenylchlorotetra-phosphonitriles
Assignee: Armstrong World Industries Inc
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Filing: 1964-03-02
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Granted: 1966-01-18
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 Irving I Bezman
- 👤 Janet H Smalley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:39
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/02; C08G79/025; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/6564; C07F9/6581; C07F9/65812; C07F9/65817
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
AN IMPROVED METHOD FOR THE PREPARATION OF PHENYLCHLOROTETRAPHOSPHONITRILE OF THE FORMULA ((C6H5)C1PN)4 CONSISTING OF INTIMATELY MIXING PHENYLPHOSPHORUS TETRACHLORIDE AND AMMONIUM CHLORIDE, REACTING SAID MIXTURE UNDER ANHYDROUS CONDITIONS AND IN THE ABSENCE OF SOLVENT AT A TEMPERATURE OF FROM ABOUT 140 TO 155*C. UNTIL EVOLUTION OF THE HYDROCHLORIC ACID GAS BYPRODUCT IS SUBSTANTIALLY COMPLETE, AND SEPARATING THE PHENYLCHLOROTETRAPHOSPHONITRILE FROM THE REACTION PRODUCT.
Claim 2
Dependent Claim
61 words
AN IMPROVED METHOD FOR THE PREPARATION OF PHENYLCHLOROTETRAPHOSPHONITRILE OF THE FORMULA ((C6H5)C1PN)4 CONSISTING OF INTIMATELY MIXING PHENYLPHOSPHORUS TETRACHLORIDE AND AMMONIUM CHLORIDE, REACTING SAID MIXTURE UNDER ANHYDROUS CONDITIONS AND IN THE ABSENCE OF SOLVENT AT A TEMPERATURE OF FROM ABOUT 140 TO 155*C. UNTIL EVOLUTION OF THE HYDROCHLORIC ACID GAS BYPRODUCT IS SUBSTANTIALLY COMPLETE, AND SEPARATING THE PHENYLCHLOROTETRAPHOSPHONITRILE FROM THE REACTION PRODUCT.
References Cited (Backward Citations)
US3138638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |