US3056769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization
Assignee: Shell USA Inc
•
Filing: 1958-12-29
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Granted: 1962-10-02
•
Expires: 1978-12-29
Abstract
No abstract record available.
Inventors
- 👤 Walter H Reay
- 👤 Brian F Street
- 👤 Ralph W King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:48
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
IN THE PROCESS FOR POLYMERIZING A MONOALPHA-OLEFIN WITH A HEAVY METAL CATALYST FORMED BY ADMIXING AN ORGANO-ALUMINUM COMPOUND AND A HALIDE OF A GROUP IVB METAL IN AN INERT-HYDROCARBON DILUENT, THE IMPROVEMENT COMPRISING A WITHDRAWING A PART OF THE POLYMER SLURRY FROM THE REACTOR, DIVIDING SAID SLURRY INTO PORTIONS AS FOLLOWS: (1) A LIQUID FRACTION COMPRISING A PORTION OF THE DILUENT OF THE POLYMERIZATION SAID LIQUID BEIN SUBSTANTIALLY FREE
Claim 2
Dependent Claim
69 words
IN THE PROCESS FOR POLYMERIZING A MONOALPHA-OLEFIN WITH A HEAVY METAL CATALYST FORMED BY ADMIXING AN ORGANO-ALUMINUM COMPOUND AND A HALIDE OF A GROUP IVB METAL IN AN INERT-HYDROCARBON DILUENT, THE IMPROVEMENT COMPRISING A WITHDRAWING A PART OF THE POLYMER SLURRY FROM THE REACTOR, DIVIDING SAID SLURRY INTO PORTIONS AS FOLLOWS: (1) A LIQUID FRACTION COMPRISING A PORTION OF THE DILUENT OF THE POLYMERIZATION SAID LIQUID BEIN SUBSTANTIALLY FREE
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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) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |