US3228201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of olefin
Assignee: Phillips Petroleum Co
•
Filing: 1961-10-06
•
Granted: 1966-01-11
•
Expires: 1981-10-06
Abstract
No abstract record available.
Inventors
- 👤 Virgil E Gaede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:28
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/005; C07C7/04; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A METHOD OF RECOVERING VALUABLE OLEFIN FROM AN OFFGAS RESULTING FROM A DEGASSING OF A SOLVENT EMPLOYED IN THE POLYMERIZATION OF AN OLEFIN TO FORM A POLYOLEFIN WHICH COMPRISES IN A COMBINATION OF STEPS, PASSING SAID SOLVENT WHICH HAS BEEN EMPLOYED AS RECITED HEREIN TO A DEGASSING ZONE THUS OBTAINING AN OFF-GAS, PARTIALY LIQUEFYING THE OFF-GAS TO LIQUEFY VAPOROUS COMPONENTS THEREIN, OBTAINING A NOW FIRST REMAINING VAPOR STREAM AND A SOLVENT STREAM, LIQUEFYING PARTIALLY SAID VAPOR STREAM, OBTAINING A NOW SECOND REMAINING VAPOR STREAM, LIQUEFYING SAID SECOND REMAINING VAPOR STREAM, OBTAINING A NOW THIRD REMAINING VAPOR STREAM, AND PASSING SAID THIRD REMAINING VAPOR STREAM TO A FRACTIONATION ZONE, IN SAID ZONE, SEPARATING A STREAM OF OLEFIN, AND COLLECTING AND TREATING IN A COMMON ZONE ALL LIQUID FRACTIONS OBTAINED FROM EACH OF SAID LIQUEFACTIONS, THEREBY RECOVERING ADDITIONAL VALUABLE OLEFIN AND VAPORS FOR RETREATMENT AS HEREIN DESCRIBED.
Claim 2
Independent Claim
145 words
A METHOD OF RECOVERING VALUABLE OLEFIN FROM AN OFFGAS RESULTING FROM A DEGASSING OF A SOLVENT EMPLOYED IN THE POLYMERIZATION OF AN OLEFIN TO FORM A POLYOLEFIN WHICH COMPRISES IN A COMBINATION OF STEPS, PASSING SAID SOLVENT WHICH HAS BEEN EMPLOYED AS RECITED HEREIN TO A DEGASSING ZONE THUS OBTAINING AN OFF-GAS, PARTIALY LIQUEFYING THE OFF-GAS TO LIQUEFY VAPOROUS COMPONENTS THEREIN, OBTAINING A NOW FIRST REMAINING VAPOR STREAM AND A SOLVENT STREAM, LIQUEFYING PARTIALLY SAID VAPOR STREAM, OBTAINING A NOW SECOND REMAINING VAPOR STREAM, LIQUEFYING SAID SECOND REMAINING VAPOR STREAM, OBTAINING A NOW THIRD REMAINING VAPOR STREAM, AND PASSING SAID THIRD REMAINING VAPOR STREAM TO A FRACTIONATION ZONE, IN SAID ZONE, SEPARATING A STREAM OF OLEFIN, AND COLLECTING AND TREATING IN A COMMON ZONE ALL LIQUID FRACTIONS OBTAINED FROM EACH OF SAID LIQUEFACTIONS, THEREBY RECOVERING ADDITIONAL VALUABLE OLEFIN AND VAPORS FOR RETREATMENT AS HEREIN DESCRIBED.
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |