US3715321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromium oxide polymerization catalyst
Assignee: Phillips Petroleum Co
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Filing: 1969-04-23
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Granted: 1973-02-06
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Expires: 1989-04-23
Abstract
Abstract ADDITIVES ARE PROVIDED TO A CHROMIC OXIDE CATALYST SYSTEM USED FOR OLEFIN POLYMERIZATION WHICH AFFECT THE COURSE OF REACTION AND/OR THE NATURE OF THE POLYMER PRODUCED, THE ADDITIVES BEING COMPOUNDS OF THE METALS OF GROUP II-A AND GROUP III-B OF THE PERIODIC TABLE.
Inventors
- 👤 B Horvath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:37
CPC Classifications
C; C03; C03C; C03C3/00; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |