US3631007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of vanadium residues from ethylene copolymers
Assignee: Covestro International SA
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Filing: 1968-10-31
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Granted: 1971-12-28
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Expires: 1988-10-31
Abstract
Abstract IN A PROCESS WHEREBY ETHYLENE IS COPOLYMERIZED WITH A POLYENE UNDER PRESSURE WITH A VANADIUM CATALYST TO FORM AMORPHOUS VULCANIZABLE ELASTOMERS, THE VANADIUM COMPOUND CONTENT OF SAID POLYMER IS REDUCED AND THE COLOR OF THE POLYMER IMPROVED BY CONTACTING AT A HIGHER PRESSURE A POLYMERIZATION EFFUENT CONTAINING THE ETHYLENE COPOLYMER AND VANADIUM CATALYST WITH A LOW MOLECULAR WEIGHT ALCOHOL OR KETONE AND THEREAFTER WASHING THIS MIXTURE UNDER PRESSURE WITH HYDRACARBON AND/OR WATER TO REMOVE THE RESIDUAL VANADIUM COMPOUND.
Inventors
- 👤 Bart A Diliddo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:28
CPC Classifications
C; C08; C08F; C08F210/00; C08F6/00; C08F6/02
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |