US3455890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for olefin polymerization
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1964-11-18
•
Granted: 1969-07-15
•
Expires: 1984-11-18
Abstract
No abstract record available.
Inventors
- 👤 Edmund B Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A PROCESS FOR PREPARING A MODIFIED FRIEDEL-CRAFTS TYPE CATALYST WHICH COMPRISES (A) ADMIXING A COMPOUND HAVING THE EMPIRICAL FORMULA RNAIXM, WHEREIN R IS A C1-C12 ALKYL, X IS HALOGEN, N IS A CARDINAL NUMBER OF FROM 0 TO 2, M IS A CARDINAL NUMBER OF FROM 1 TO 3, AND N PLUS M EQUALS 3, WITH A HALIDE OF A CATIONIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, POTASSIUM AND AMMONIUM AT A TEMPERATURE OF BETWEEN ABOUT 0*C. AND ABOUT 100*C., (B) SEPARATING THE SOLID PHASE FROM THE LIQUID PHASE, AND (C) RECOVERING, AS A MODIFIED FRIEDEL-CRAFTS CATALYST, THE LIQUID PHASE OF THE UNCOMPLEXED ADMIXTURE AT A TEMPERATURE OF BETWEEN ABOUT 0*C. AND ABOUT 50*C.
Claim 2
Dependent Claim
117 words
A PROCESS FOR PREPARING A MODIFIED FRIEDEL-CRAFTS TYPE CATALYST WHICH COMPRISES (A) ADMIXING A COMPOUND HAVING THE EMPIRICAL FORMULA RNAIXM, WHEREIN R IS A C1-C12 ALKYL, X IS HALOGEN, N IS A CARDINAL NUMBER OF FROM 0 TO 2, M IS A CARDINAL NUMBER OF FROM 1 TO 3, AND N PLUS M EQUALS 3, WITH A HALIDE OF A CATIONIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, POTASSIUM AND AMMONIUM AT A TEMPERATURE OF BETWEEN ABOUT 0*C. AND ABOUT 100*C., (B) SEPARATING THE SOLID PHASE FROM THE LIQUID PHASE, AND (C) RECOVERING, AS A MODIFIED FRIEDEL-CRAFTS CATALYST, THE LIQUID PHASE OF THE UNCOMPLEXED ADMIXTURE AT A TEMPERATURE OF BETWEEN ABOUT 0*C. AND ABOUT 50*C.
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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) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |