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Patent US2981716A successfully refreshed from Google Patents.
US2981716A
Expired / Lapsed
US
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Alpha-olefin polymers stabilized with phenyl phosphine derivatives
Assignee: Shell USA Inc
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Filing: 1959-06-18
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Granted: 1961-04-25
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Expires: 1979-06-18
Abstract
No abstract record available.
Inventors
- 👤 Brian F Street
- 👤 Wladyslaw H Skoroszewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:48
CPC Classifications
C; C08; C08F; C08F6/00; C08F6/02; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5377
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A COMPOSITION COMPRISING A POLYMER OF AN ALPHAOLEFIN CONTAINING TITANIUM METALLIC RESIDUES AND FROM 0.01 TO ABOUT 5%, BY WEIGHT, OF A PHOSPHINE OF THE FORMULA P(R)(R'')(R") WHEREIN R IS A HYDROCARBON RADICAL CONTAINING AN AROMATIC NUCLEUS AND R'' AND R" ARE HYDROCARBON RADICALS.
Claim 2
Dependent Claim
44 words
A COMPOSITION COMPRISING A POLYMER OF AN ALPHAOLEFIN CONTAINING TITANIUM METALLIC RESIDUES AND FROM 0.01 TO ABOUT 5%, BY WEIGHT, OF A PHOSPHINE OF THE FORMULA P(R)(R'')(R") WHEREIN R IS A HYDROCARBON RADICAL CONTAINING AN AROMATIC NUCLEUS AND R'' AND R" ARE HYDROCARBON RADICALS.
References Cited (Backward Citations)
US2860115A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |