US3106569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic production of maleic and phthalic anhydride
Assignee: Monsanto Chemicals Ltd
•
Filing: 1959-12-03
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Granted: 1963-10-08
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Expires: 1979-12-03
Abstract
No abstract record available.
Inventors
- 👤 Warn D Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:28
CPC Classifications
C; C07; C07D; C07D307/00; C07D307/77; C07D307/87; C07D307/89; B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/28; C07D307/02; C07D307/34; C07D307/56; C07D307/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS OF PREPARING PHTHALIC ANHYDRIDE BY THE CONTROLLED VAPOR PHASE CATALYTIC OXIDATION OF NAPHTHALENE, THE STEP COMPRISING PASSING A MIXTURE OF NAPHTHALENE AND AN OXYGEN CONTAINING GAS AT AN ELEVATED TEMPERATURE THROUGH A CATALYST MASS COMPRISING A CARRIER SUPPORTING A MIXTURE OF OXIDES OF VANADIUM, MOLYBDENUM AND TITANIUM IN THE PROPORTIONS REPRESENTED BY THE ATOMIC PERCENTAGES OF SAID METALS OF FROM ABOUT 50 TO ABOUT 90 ATOMIC PERCENT VANADIUM, FROM ABOUT 5 TO ABOUT 45 ATOMIC PERCENT MOLYBDENUM AND FROM ABOUT 2 TO ABOUT 30 ATOMIC PERCENT TITANIUM.
Claim 2
Dependent Claim
109 words
IN A PROCESS FOR PREPARING MALEIC ANHYDRIDE BY THE CONTROLLED VAPOR PHASE CATALYTIC OXIDATION OF BENZENE, THE STEP COMPRISING PASSING A MIXTURE OF BENZENE AND AN OXYGEN CONTAINING GAS AT A TEMPERATURE OF FROM 300* TO 600*C. THROUGH A CATALYST CONTACT MASS WHICH COMPRISES AN INERT CARRIER BODY COMPOSED OF FUSED FINELY DIVIDED SILICA AND FINELY DIVIDED PARTICLES OF A REFRACTORY GLASS, SUPPORTING A MIXTURE OF OXIDES OF VANADIUM, MOLYBDENUM AND TITANIUM IN THE PROPORTIONS REPRESENTED BY THE ATOMIC PERCENTAGES FROM SAID METALS OF FROM 50 TO 90 ATOMIC PERCENT OF VANADIUM, FROM 5 TO 45 ATOMIC PERCENT OF MOLYBDENUM AND FROM 3 TO 15 ATOMIC PERCENT OF TITANIUM.
References Cited (Backward Citations)
US1324715A
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FR721763A
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US1880901A
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FR49921E
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FR894757A
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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) | 1966-10-07 | 1967-04-08 | 1967-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-10-07 | 1971-04-08 | 1971-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-10-07 | 1975-04-08 | 1975-10-08 | $7700.00 | Window Closed / Lapsed |