Patent US3624063A successfully refreshed from Google Patents.
US3624063A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene polymerization using catalyst of controlled particle size
Assignee: Phillips Petroleum Co
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Filing: 1969-07-10
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Granted: 1971-11-30
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Expires: 1989-07-10
Abstract
Abstract A process for producing particle-form olefin polymer in which the size of the silica-supported chromium oxide catalyst is selected to regulate the molecular weight distribution of the polymer.
Inventors
- 👤 Donald R Witt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:06
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
25 words
The process as defined in claim 1 in which the catalyst mesh size is from about 20 to about 500 mesh, U.S. Standard Sieve Series.
Claim 2
Dependent Claim
19 words
The process as defined in claim 1 in which the catalyst comprises chromium oxide supported on a silica base.
Claim 3
Dependent Claim
25 words
The process as defined in claim 1 in which the catalyst mesh size is from about 100 to about 325 mesh, U.S. Standard Sieve Series.
Claim 4
Dependent Claim
39 words
The process as defined in claim 1 in which the polymer has an HLMI/MI ratio within the range of from about 60 to about 80 and a melt index within the range of from about 1.00 to about 1.10.
References Cited (Backward Citations)
US3288767A
Cited
US3225023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |