US2508744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene polymerization
Assignee: Standard Oil Development Co
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Filing: 1947-12-30
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Granted: 1950-05-23
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Expires: 1967-12-30
Abstract
No abstract record available.
Inventors
- 👤 Carl S Carlson
- 👤 Robert S Merrington
- 👤 Frank A Biribauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:02
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
IN A PROCESS FOR SELECTIVELY POLYMERIZING PROPYLENE IN A LIQUID C3 HYDROCARBON FRACTION WITH GASEOUS BF3 AS CATALYST ACTIVATED BY A SMALL AMOUNT OF A LIQUID OXYGEN-CONTAINING COMPOUND THE IMPROVEMENT COMPRISING POLYMERIZING THE LIQUID PROPYLENE IN A REACTION ZONE, REMOVING A RESULTING REACTION MIXTURE COMPRISING LIQUID PROPYLENE POLYMER PRODUCT, LIQUID C3 HYDROCARBONS, THE LIQUID OXYGEN-CONTAINING COMPOUND AND BF3 CATALYST FROM THE REACTION ZONE TO A SEPARATION ZONE MAINTAINED AT A PRESSURE AND TEMPERATURE THAT MAINTAIN C3 HYDROCARBONS IN THE LIQUID PHASE WITH A MINOR PROPORTION OF BF3 CATALYST DISSOLVED THEREIN, WITHDRAWING GASEOUS CATALYST SUBSTANTIALLY FREE OF ORGANIC COMPOUNDS FROM THE SEPARATION ZONE AND RECYCLING THE THUS WITHDRAWN CATALYST TO THE REACTION ZONE.
Claim 2
Dependent Claim
112 words
IN A PROCESS FOR SELECTIVELY POLYMERIZING PROPYLENE IN A LIQUID C3 HYDROCARBON FRACTION WITH GASEOUS BF3 AS CATALYST ACTIVATED BY A SMALL AMOUNT OF A LIQUID OXYGEN-CONTAINING COMPOUND THE IMPROVEMENT COMPRISING POLYMERIZING THE LIQUID PROPYLENE IN A REACTION ZONE, REMOVING A RESULTING REACTION MIXTURE COMPRISING LIQUID PROPYLENE POLYMER PRODUCT, LIQUID C3 HYDROCARBONS, THE LIQUID OXYGEN-CONTAINING COMPOUND AND BF3 CATALYST FROM THE REACTION ZONE TO A SEPARATION ZONE MAINTAINED AT A PRESSURE AND TEMPERATURE THAT MAINTAIN C3 HYDROCARBONS IN THE LIQUID PHASE WITH A MINOR PROPORTION OF BF3 CATALYST DISSOLVED THEREIN, WITHDRAWING GASEOUS CATALYST SUBSTANTIALLY FREE OF ORGANIC COMPOUNDS FROM THE SEPARATION ZONE AND RECYCLING THE THUS WITHDRAWN CATALYST TO THE REACTION ZONE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |