US2981725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing olefins
Assignee: Shell USA Inc
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Filing: 1956-10-15
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Granted: 1961-04-25
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Expires: 1976-10-15
Abstract
No abstract record available.
Inventors
- 👤 Norbert W Luft
- 👤 Waddan Dhafir Yusuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:02
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
IN THE METHOD FOR POLYMERIZING A MONO-ALPHA OLEFIN OF TWO TO THREE CARBON ATOMS AT TEMPERATURES RANGING BELOW ABOUT 120*C. AND PRESSURES BELOW 500 P.S.I.G., THE SAID POLYMERIZATION BEING CONDUCTED IN THE PRESENCE OF AN INERT HYDROCARBON SOLVENT AND IN CONTACT WITH A CATALYST THAT CONSISTS ESSENTIALLY OF THE PRODUCT OF ALUMINUM DIETHYL CHLORIDE AND TITANIUM TETRACHLORIDE, THE IMPROVEMENT COMPRISING MIXING THE SAID CATALYST WITH A SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM CARBONATE, POTASSIUM CARBONATE, CALCIUM CHLORIDE, SODIUM CHLORIDE, SODIUM SULFATE, AND MAGNESIUM CHLORIDE, THE SAID SALT BEING USED IN AN AMOUNT RANGING FROM 0.5 TO 3 PARTS BY WEIGHT PER 0.005 TO 1 MOLE OF THE SAID ALUMINUM COMPOUND.
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |