US2971925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization catalysts
Assignee: Shell USA Inc
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Filing: 1959-02-16
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Granted: 1961-02-14
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Expires: 1979-02-16
Abstract
No abstract record available.
Inventors
- 👤 De Loss E Winkler
- 👤 Nozaki Kenzie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:56
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A CATALYST COMPOSITION PREPARED BY THE SEQUENCE OF STEPS COMPRISING (1) REACTING HYDROCARBON SOLUTIONS OF ALUMINUM TRIETHYL AND TITANIUM TETRACHLORIDE IN A MOLE RATIO RANGING FROM ABOUT .1:1 TO LESS THAN .4:1 AT ELEVATED TEMPERATURES UNTIL AT LEAST THE ALUMINUM TRIETHYL IS COMPLETELY OXIDIZED AND (2) THEREAFTER REACTING THE TOTAL PRODUCT OF (1) WITH A HYDROCARBON SOLUTION OF ALUMINUM DIETHYL CHLORIDE IN AN AMOUNT TO GIVE A TOTAL ALUMINUM TO TITANIUM MOLE RATIO OF AT LEAST 1:1.
Claim 2
Dependent Claim
77 words
A CATALYST COMPOSITION PREPARED BY THE SEQUENCE OF STEPS COMPRISING (1) REACTING HYDROCARBON SOLUTIONS OF ALUMINUM TRIETHYL AND TITANIUM TETRACHLORIDE IN A MOLE RATIO RANGING FROM ABOUT .1:1 TO LESS THAN .4:1 AT ELEVATED TEMPERATURES UNTIL AT LEAST THE ALUMINUM TRIETHYL IS COMPLETELY OXIDIZED AND (2) THEREAFTER REACTING THE TOTAL PRODUCT OF (1) WITH A HYDROCARBON SOLUTION OF ALUMINUM DIETHYL CHLORIDE IN AN AMOUNT TO GIVE A TOTAL ALUMINUM TO TITANIUM MOLE RATIO OF AT LEAST 1:1.
References Cited (Backward Citations)
US2943063A
Cited
US2898327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-14 | 1964-08-15 | 1965-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-14 | 1968-08-15 | 1969-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-14 | 1972-08-15 | 1973-02-14 | $7700.00 | Window Closed / Lapsed |