US2824859A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of resins by reaction of maleic anhydride with steam-cracked fractions
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1953-03-18
•
Granted: 1958-02-25
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Expires: 1973-03-18
Abstract
No abstract record available.
Inventors
- 👤 Egi V Fasce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
C; C08; C08F; C08F10/00; C08F222/00; C08F222/04; C08F222/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A SEPARATION PROCESS WHICH COMPRISES EXTRACTING NORMAL ALIPHATIC OLEFINS AND PARAFFINS CONTAINED IN A STEAMCRACKED PETROLEUM FRACTION BOILING BETWEEN ABOUT 200* AND 600*F. WITH UREA AND REMOVING THEREFROM THE RESULTING SOLID EXTRACT TO OBTAIN A RAFFINATE CONTAINING DIOLEFINS, BRANCHED-CHAIN OLEFINS, AROMATIC HYDROCARBONS AND CYCLIC OLEFINS, CONDENSING THE BRANCHED-CHAIN OLEFINS AND DIOLEFINS CONTAINED IN SAID RAFFINATE WITH MALEIC ANHYDRIDE AT A TEMPERATURE OF AT LEAST 75*F. AND REMOVING THEREFROM THE RESULTING CONDENSATE, AND RECOVERING THE REMAINING AROMATIC HYDROCARBONS AND DYCLIC OLEFINS.
Claim 2
Dependent Claim
80 words
A SEPARATION PROCESS WHICH COMPRISES EXTRACTING NORMAL ALIPHATIC OLEFINS AND PARAFFINS CONTAINED IN A STEAMCRACKED PETROLEUM FRACTION BOILING BETWEEN ABOUT 200* AND 600*F. WITH UREA AND REMOVING THEREFROM THE RESULTING SOLID EXTRACT TO OBTAIN A RAFFINATE CONTAINING DIOLEFINS, BRANCHED-CHAIN OLEFINS, AROMATIC HYDROCARBONS AND CYCLIC OLEFINS, CONDENSING THE BRANCHED-CHAIN OLEFINS AND DIOLEFINS CONTAINED IN SAID RAFFINATE WITH MALEIC ANHYDRIDE AT A TEMPERATURE OF AT LEAST 75*F. AND REMOVING THEREFROM THE RESULTING CONDENSATE, AND RECOVERING THE REMAINING AROMATIC HYDROCARBONS AND DYCLIC OLEFINS.
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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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |