Patent US2889383A successfully refreshed from Google Patents.
US2889383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dehydrogenation process
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-04-16
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Granted: 1959-06-02
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Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
- 👤 Green A Donald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:48
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
AN IMPROVED PROCESS FROM DEHYDROGENATING C4-C5 PARAFFINS TO DIOLEFINS WHICH COMPRISES SUSPENDING FINELY DIVIDED HOT DEHYDROGENATION CATALYST, PREHEATED TO A TEMPEATURE OF FROM ABOUT 1150-1450*F., IN A VOPOR STREAM OF SAID PARAFFINS IN A VERTICAL TRANSFER LINE REACTION ZONE OF RELATIVELY NARROW CROSS SECTION, MAINTAINING SUBATMOSPHERIC PRESSURES OF 100 TO 400 MM. HG IN SAID ZONE, PASSING THE SUSPENDED CATALYST UNIFORMYL AND SUBSTANTIALLY AT THE SAME VELOCITY AS TEH REACTANT VAPOR UPWARDLY THROUGH THE REACTION ZONE FORM A CONTACT PERIOD OF LESS THAN 1 SECOND AT A REACTION TEMPERATURE OF ABOUT 1150* TO 1450*F., MAINTAINING A CATALYST DENSITY IN THE RANGE OF ABOUT 0.5-10 LBS-CUBIC FOOT THEREIN, DISCHARGING RESULTING VAPOR PRODUCTS WITH THE SUSPENDED CASTALYST FROM THE END OF THE REACTION ZONE INTO A SEPARTION ZONE AND SETTLING THE SUSPENDED CATALYST FROM THE VAPOR PRODUCTS, IMMEDIATELY QUENCHING THE SEPARATE VAPOR PRODUCTS AND
Claim 2
Dependent Claim
142 words
AN IMPROVED PROCESS FROM DEHYDROGENATING C4-C5 PARAFFINS TO DIOLEFINS WHICH COMPRISES SUSPENDING FINELY DIVIDED HOT DEHYDROGENATION CATALYST, PREHEATED TO A TEMPEATURE OF FROM ABOUT 1150-1450*F., IN A VOPOR STREAM OF SAID PARAFFINS IN A VERTICAL TRANSFER LINE REACTION ZONE OF RELATIVELY NARROW CROSS SECTION, MAINTAINING SUBATMOSPHERIC PRESSURES OF 100 TO 400 MM. HG IN SAID ZONE, PASSING THE SUSPENDED CATALYST UNIFORMYL AND SUBSTANTIALLY AT THE SAME VELOCITY AS TEH REACTANT VAPOR UPWARDLY THROUGH THE REACTION ZONE FORM A CONTACT PERIOD OF LESS THAN 1 SECOND AT A REACTION TEMPERATURE OF ABOUT 1150* TO 1450*F., MAINTAINING A CATALYST DENSITY IN THE RANGE OF ABOUT 0.5-10 LBS-CUBIC FOOT THEREIN, DISCHARGING RESULTING VAPOR PRODUCTS WITH THE SUSPENDED CASTALYST FROM THE END OF THE REACTION ZONE INTO A SEPARTION ZONE AND SETTLING THE SUSPENDED CATALYST FROM THE VAPOR PRODUCTS, IMMEDIATELY QUENCHING THE SEPARATE VAPOR PRODUCTS AND
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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) | 1962-06-01 | 1962-12-01 | 1963-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-01 | 1966-12-01 | 1967-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-01 | 1970-12-01 | 1971-06-02 | $7700.00 | Window Closed / Lapsed |