US2986557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of ethylene in the presence of vanadium-containing catalyst
Assignee: Phillips Petroleum Co
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Filing: 1958-03-28
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Granted: 1961-05-30
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Expires: 1978-03-28
Abstract
No abstract record available.
Inventors
- 👤 Robert L Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:37
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A METHOD OF POLYMERIZING ETHYLENE TO A NORMALLY SOLID POLYMER WHICH COMPRISES CONTACTING ETHYLENE UNDER POLYMERIZING CONDITIONS WITH A CATALYST PREPARED BY IMPREGNATING A SILICA-ALUMINA SUPPORT WITH VANADYL SULFATE AND ACTIVATING THE IMPREGNATED SUPPORT BY HEATING IN AN OXYGEN-CONTAINING ATMOSPHERE.
Claim 2
Independent Claim
40 words
A METHOD OF POLYMERIZING ETHYLENE TO A NORMALLY SOLID POLYMER WHICH COMPRISES CONTACTING ETHYLENE UNDER POLYMERIZING CONDITIONS WITH A CATALYST PREPARED BY IMPREGNATING A SILICA-ALUMINA SUPPORT WITH VANADYL SULFATE AND ACTIVATING THE IMPREGNATED SUPPORT BY HEATING IN AN OXYGEN-CONTAINING ATMOSPHERE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-29 | 1964-11-28 | 1965-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-29 | 1968-11-28 | 1969-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-29 | 1972-11-28 | 1973-05-30 | $7700.00 | Window Closed / Lapsed |