Patent US3228201A successfully refreshed from Google Patents.
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
2026-11-07 13:20
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.
References Cited (Backward Citations)
US2497421A
Cited
US2469724A
Cited
US2705698A
Cited
US2765635A
Cited
US2825721A
Cited
US2817961A
Cited
US2880592A
Cited
US2916888A
Cited
US2938934A
Cited
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 |