Patent US3268627A successfully refreshed from Google Patents.
US3268627A
Expired / Lapsed
US
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Blends of isotactic and syndiotactic polypropylene
Assignee: Standard Oil Co
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Filing: 1963-05-16
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Granted: 1966-08-23
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Expires: 1983-05-16
Abstract
No abstract record available.
Inventors
- 👤 Donald D Emrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:34
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L2205/00; C08L2205/02; C08L2205/025; C08L2205/03; C08L2205/035; C08L2207/00; C08L2207/10; C08L2207/12; C08L2207/14; C08L23/18; C08L23/20; C08L23/22; C08L2314/00; C08L2314/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE COMPOSITION COMPRISING AN INTIMATE BLEND OF FROM ABOUT 50 TO 97% BY WEIGHT OF A CRYSTALLINE ISOTACTIC POLYMER OF AN ALPHA-OLFIN CONTAINING FROM 3 TO 8 CARBON ATOMS AND FROM ABOUT 3 TO 50% BY WEIGHT OF A CRYSTALLINE SYNDIOTACTIC POLYMER OF AN ALPHA-OLEFIN CONTAINING FROM 3 TO 8 CARBON ATOMS, SAID SYNDIOTACTIC POLYMER BEING PREPARED BY THE POLYMERIZATION SAID ALPHA-OLEFIN IN THE PRESENCE OF AN ORGANOMETALLIC COORDINATION CATALYST COMPOSED OF LITHIUM ALKYL HYDRIDE, TITANIUM TETRACHLORIDE AND A TRIARYL PHOSPHINE.
Claim 2
Dependent Claim
81 words
THE COMPOSITION COMPRISING AN INTIMATE BLEND OF FROM ABOUT 50 TO 97% BY WEIGHT OF A CRYSTALLINE ISOTACTIC POLYMER OF AN ALPHA-OLFIN CONTAINING FROM 3 TO 8 CARBON ATOMS AND FROM ABOUT 3 TO 50% BY WEIGHT OF A CRYSTALLINE SYNDIOTACTIC POLYMER OF AN ALPHA-OLEFIN CONTAINING FROM 3 TO 8 CARBON ATOMS, SAID SYNDIOTACTIC POLYMER BEING PREPARED BY THE POLYMERIZATION SAID ALPHA-OLEFIN IN THE PRESENCE OF AN ORGANOMETALLIC COORDINATION CATALYST COMPOSED OF LITHIUM ALKYL HYDRIDE, TITANIUM TETRACHLORIDE AND A TRIARYL PHOSPHINE.
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |