Patent US3220995A successfully refreshed from Google Patents.
US3220995A
Expired / Lapsed
US
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Propylene polymerization with reduced titanium halide and organic sulfide
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1960-10-27
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Granted: 1965-11-30
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Expires: 1980-10-27
Abstract
No abstract record available.
Inventors
- 👤 Eugene L Stogryn
- 👤 Herbert F Strohmayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:03
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
IN THE POLYMERIZATION OF PROPYLENE TO FORM SOLID POLYPROPYLENE, THE IMPROVEMENT OF PREPARING POLYMERS OF GREATER PROCESSABILITY WHICH COMPRISES EFFECTING THE POLYMERIZATION IN THE PRESENCE OF A CATALYTIC MIXTURE OF TITANIUM TRICHLORIDE CONTAINING COCRYSTALLIZED ALUMINUM CHLORIDE, ALUMINUM TRIETHYL AND DIBENZYL SULFIDE, WHEREIN THE MOLAR RATIOS OF A1/TI ARE 1/2-10-1 AND THE DIBENZYL SULFIDE/TITANIUM MOLAR RATIOS ARE 10/1-1/10.
Claim 2
Dependent Claim
57 words
IN THE POLYMERIZATION OF PROPYLENE TO FORM SOLID POLYPROPYLENE, THE IMPROVEMENT OF PREPARING POLYMERS OF GREATER PROCESSABILITY WHICH COMPRISES EFFECTING THE POLYMERIZATION IN THE PRESENCE OF A CATALYTIC MIXTURE OF TITANIUM TRICHLORIDE CONTAINING COCRYSTALLIZED ALUMINUM CHLORIDE, ALUMINUM TRIETHYL AND DIBENZYL SULFIDE, WHEREIN THE MOLAR RATIOS OF A1/TI ARE 1/2-10-1 AND THE DIBENZYL SULFIDE/TITANIUM MOLAR RATIOS ARE 10/1-1/10.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |