Patent US3717577A successfully refreshed from Google Patents.
US3717577A
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US
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Stabilized olefin polymers
Assignee: Phillips Petroleum Co
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Filing: 1970-02-06
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Granted: 1973-02-20
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Expires: 1990-02-06
Abstract
Abstract OLEFIN POLYMERS ARE STABILIZED TO MINIMIZE MELT INDEX OR MELT FLOW DECREASE AT ELEVATED TEMPERATURE BY ADMIXING THE POLYMER WITH AN ALKALI METAL NITRITE, AN ALKALI METAL NITRITE AND AN ALKALI METAL BISULFITE, OR MIXTURES THEREOF, THE CONCENTRATION OF THE ALKALINE METAL NITRITE AND THE ALKALI METAL BISULFITE IN THE STABILIZED POLYMER BEING IN THE RANGE OF 0.005 TO 0.3 WEIGHT PER CENT EACH. WHEN MINIMUM DISCOLORATION OF THE POLYMER IS DERIVED, THE CONCENTRATION OF THE ALKALI METAL BISULFITE AND/OR THE ALKALI METAL NITRITE IS MAINTAINED IN THE RANGE OF 0.005 TO 0.01 WEIGHT PERCENT.
Inventors
- 👤 C Moon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:59
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/28; C08K3/30
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |