Patent US2987538A successfully refreshed from Google Patents.
US2987538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kophthalonitrile
Assignee: —
•
Filing: —
•
Granted: 1961-06-06
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Expires: 1978-06-06
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:43
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/28; B; B01; B01J; B01J23/00; B01J23/002; B01J23/16; B01J23/24; B01J23/26; B01J23/28; B01J35/00; B01J35/60; B01J35/61; B01J35/613; B01J37/00; B01J37/08; B01J2523/00; B01J2523/50; B01J2523/55; B01J2523/60; B01J2523/67
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
THE PROCESS FOR THE PRODUCTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALONITRILE AND ISOPHTHALONITRILE WHICH COMPRISES CONTACTING AT A TEMPERATURE BETWEEN 300-500*C. A GAS MIXTURE CONTAINING A HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF META-XYLENE AND PARA-XYLENE, SAID GAS MIXTURE COMPRISING NOT MORE THAN 2% BY VOLUME OF SAID HYDROCARBON, AT LEAST 3 MOLES OF OXYGEN PER MOLE OF HYDROCARBON AND AT LEAST TWICE THE THEORETICAL RATIO OF AMMONIA FOR THE STOICHIOMETRIC REACTION, WITH A CATALYST CONSISTING ESSENTIALLY OF VANADIUM OXIDE AND CHROMIUM OXIDE DEPOSITED ON ACTIVATED ALUMINA WHICH HAS BEEN HEAT TREATED PRIOR TO DEPOSITION OF THE CATALYST THEREON TO A TEMPERATURE IN THE RANGE OF 1,000 TO 1,500*C., THE ATOMIC RATIO OF THE VANADIUM TO CHROMIUM IN THE CATALYST LYING BETWEEN 1:1 AND 1:2.
Claim 2
Dependent Claim
129 words
THE PROCESS FOR THE PRODUCTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALONITRILE AND ISOPHTHALONITRILE WHICH COMPRISES CONTACTING AT A TEMPERATURE BETWEEN 300-500*C. A GAS MIXTURE CONTAINING A HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF META-XYLENE AND PARA-XYLENE, SAID GAS MIXTURE COMPRISING NOT MORE THAN 2% BY VOLUME OF SAID HYDROCARBON, AT LEAST 3 MOLES OF OXYGEN PER MOLE OF HYDROCARBON AND AT LEAST TWICE THE THEORETICAL RATIO OF AMMONIA FOR THE STOICHIOMETRIC REACTION, WITH A CATALYST CONSISTING ESSENTIALLY OF VANADIUM OXIDE AND CHROMIUM OXIDE DEPOSITED ON ACTIVATED ALUMINA WHICH HAS BEEN HEAT TREATED PRIOR TO DEPOSITION OF THE CATALYST THEREON TO A TEMPERATURE IN THE RANGE OF 1,000 TO 1,500*C., THE ATOMIC RATIO OF THE VANADIUM TO CHROMIUM IN THE CATALYST LYING BETWEEN 1:1 AND 1:2.
References Cited (Backward Citations)
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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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |