US2691660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of maleic anhydride
Assignee: EIDP Inc
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Filing: 1950-03-07
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Granted: 1954-10-12
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Expires: 1970-03-07
Abstract
No abstract record available.
Inventors
- 👤 Hartig Martval John Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:39
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/16; C07C51/21; C07C51/215
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
PROCESS OF PREPARING MALETIC ANHYDRIDE WHICH COMPRISES BRINGING THE VAPOR OF A SATURATED ALIPHATIC HYDROCARBON HAVING FROM 4 TO 10 CARBON ATOMS, INCLUSIVE, IN THE PRESENCE OF OXYGEN IN CONTACT WITH A PRECIPITATED OXIDE CATALYST CONSISTING OF MOLYBDENUM OXIDE COMBINED WITH A BASIC METAL OXIDE FROM THE GROUP CONSISTING OF THE OXIDES OF COBALT AND NICKEL, THE ATOMIC RATIO OF THE BASIC METAL OF MOLYBEDNUM BEING FROM 0.90:1 TO 0.62:1, AT A TEMPERATURE BETWEEN 300* C. AND 600* C., AND THEREAFTER RECOVERING THE MALEIC ANHYDRIDE FROM THE EFFLUENT GASES.
Claim 2
Dependent Claim
89 words
PROCESS OF PREPARING MALETIC ANHYDRIDE WHICH COMPRISES BRINGING THE VAPOR OF A SATURATED ALIPHATIC HYDROCARBON HAVING FROM 4 TO 10 CARBON ATOMS, INCLUSIVE, IN THE PRESENCE OF OXYGEN IN CONTACT WITH A PRECIPITATED OXIDE CATALYST CONSISTING OF MOLYBDENUM OXIDE COMBINED WITH A BASIC METAL OXIDE FROM THE GROUP CONSISTING OF THE OXIDES OF COBALT AND NICKEL, THE ATOMIC RATIO OF THE BASIC METAL OF MOLYBEDNUM BEING FROM 0.90:1 TO 0.62:1, AT A TEMPERATURE BETWEEN 300* C. AND 600* C., AND THEREAFTER RECOVERING THE MALEIC ANHYDRIDE FROM THE EFFLUENT GASES.
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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) | 1957-10-11 | 1958-04-12 | 1958-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-11 | 1962-04-12 | 1962-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-11 | 1966-04-12 | 1966-10-12 | $7700.00 | Window Closed / Lapsed |