US3773743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the color of ziegler olefin polymers
Assignee: Dow Chemical Co
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Filing: 1969-02-03
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Granted: 1973-11-20
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Expires: 1989-02-03
Abstract
Abstract POLYMERS OF OLEFINS AND/OR OTHER ETHYLENICALLY UNSATURATED MONOMERS CONTAINING METALLIC CATALYST RESIDUES ARE STABILIZED AGAINST DISCOLORATION AND DEGRADATION DURING AND AFTER HIGH TEMPERATURE PROCESSING BY CONTACTING THE POLYMER WITH A HYDROXYL COMPOUND, SUCH AS WATER, AND AN ORGANIC BASE, SUCH AS TRIETHANOL AMINE, IMMEDIATELY PRIOR TO AND/OR CONCURRENT WITH HIGH TEMPERATURE PROCESSING OF THE POLYMER.
Inventors
- 👤 O Ainsworth
- 👤 J Lochary
- 👤 S Stain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:01
CPC Classifications
C; C08; C08F; 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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |