Patent US3131209A successfully refreshed from Google Patents.
US3131209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of isophthalonitriles and terephthalonitriles
Assignee: Monsanto Chemicals Ltd
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Filing: 1961-09-11
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Granted: 1964-04-28
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Henry L King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:32
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD FOR PREPARING A PHTHALONITRILE WHICH COMPRISES MIXING ONE COMPOUND FROM THE GROUP CONSISTING OF ISOPHTHALIC ACID, TEREPHTHALIC ACID, M-CYANBENZOIC ACID, P-CYANOBENZOIC ACID, AND THEIR AMMONIUM SALTS, MONOAMIDES AND DIAMIDES IN A REACTION MEDIUM OF ADIPONITRILE, REACTING SAID COMPOUND WITH A MEMBER OF THE GROUP CONSISTING OF AMMONIA AND UREA IN THE PRESENCE OF A DEHYDRATING CATALYSST WHILE MAINTAINING A TEMPERATURE WITHIN THE RANGE OF 150* TO 350*C., WITHDRAWING THE VAPOROUS EFFUENT COMPRISING PHTHALONITRILE AND ADIPONITRILE FROM SAID REACTION, CONDENSING SAID EFFUENT AND RECOVERING THE SOLID PHTHALONITRILE FROM THE CONDENSED EFFUENT.
Claim 2
Independent Claim
92 words
A METHOD FOR PREPARING A PHTHALONITRILE WHICH COMPRISES MIXING ONE COMPOUND FROM THE GROUP CONSISTING OF ISOPHTHALIC ACID, TEREPHTHALIC ACID, M-CYANBENZOIC ACID, P-CYANOBENZOIC ACID, AND THEIR AMMONIUM SALTS, MONOAMIDES AND DIAMIDES IN A REACTION MEDIUM OF ADIPONITRILE, REACTING SAID COMPOUND WITH A MEMBER OF THE GROUP CONSISTING OF AMMONIA AND UREA IN THE PRESENCE OF A DEHYDRATING CATALYSST WHILE MAINTAINING A TEMPERATURE WITHIN THE RANGE OF 150* TO 350*C., WITHDRAWING THE VAPOROUS EFFUENT COMPRISING PHTHALONITRILE AND ADIPONITRILE FROM SAID REACTION, CONDENSING SAID EFFUENT AND RECOVERING THE SOLID PHTHALONITRILE FROM THE CONDENSED EFFUENT.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |