Patent US2833807A successfully refreshed from Google Patents.
US2833807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of phthalonitriles
Assignee: Honeywell International Inc
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Filing: 1956-06-26
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Granted: 1958-05-06
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Expires: 1976-06-26
Abstract
No abstract record available.
Inventors
- 👤 Farkas Adalbert
- 👤 Rosenthal Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:12
CPC Classifications
C; C07; C07C; C07C253/00; C07C253/24; C07C253/28; Y; Y10; Y10S; Y10S203/00; Y10S203/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
THE METHOD OF PREPARING PHTHALONITRILES WHICH COMPRISES PASSING A GASEOUS MIXTURE COMPRISING A XYLENE, OXYGEN AND ABOUT 2 TO 3.5 MOLS OF AMMONIA PER MOL OF XYLENE UPWARDLY THROUGH A FINELY DIVIDED CATALYST FOR THE VAPOR PHASE PARTIAL OXIDATION OF BENZENE AND NAPHTHALENE, RESPECTIVELY, TO MALEIC AND PHTHATIC ANHYDRIDE AT LINEAR VELOCITY SUFFICIENT TO EFFECT FLUIDIZATION OF THE CATALYST, AND MAINTAINING SAID GASEOUS MIXTURE IN CONTACT WITH THE CATALYST AT A TEMPERATURE OF ABOUT 300 TO 550*C.
Claim 2
Independent Claim
77 words
THE METHOD OF PREPARING PHTHALONITRILES WHICH COMPRISES PASSING A GASEOUS MIXTURE COMPRISING A XYLENE, OXYGEN AND ABOUT 2 TO 3.5 MOLS OF AMMONIA PER MOL OF XYLENE UPWARDLY THROUGH A FINELY DIVIDED CATALYST FOR THE VAPOR PHASE PARTIAL OXIDATION OF BENZENE AND NAPHTHALENE, RESPECTIVELY, TO MALEIC AND PHTHATIC ANHYDRIDE AT LINEAR VELOCITY SUFFICIENT TO EFFECT FLUIDIZATION OF THE CATALYST, AND MAINTAINING SAID GASEOUS MIXTURE IN CONTACT WITH THE CATALYST AT A TEMPERATURE OF ABOUT 300 TO 550*C.
References Cited (Backward Citations)
US2499055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |