Patent US2486218A successfully refreshed from Google Patents.
Patent US3644592A successfully refreshed from Google Patents.
US3644592A
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Propylene polymer composition containing small amounts of urea phthalic anhydride and pvc
Assignee: Phillips Petroleum Co
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Filing: 1969-12-29
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Granted: 1972-02-22
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Expires: 1989-12-29
Abstract
Abstract POLYPROPYLENE AND BLOCK COPOLYMERS OF PROPYLENE AND ETHYLENE ARE IMPROVED IN OPTICAL PROPERTIES, GAS PERMEABILITY PROPERTIES, AND OTHER PROPERTIES BY ADDING THERETO PHTHALIC ANHYDRIDE, UREA AND POLYVINYL CHLORIDE.
Inventors
- 👤 Dixie E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:46
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/21; C08K5/04; C08K5/15; C08K5/151; C08K5/1535; C08K5/1539; C08L; C08L23/00; C08L23/02; C08L23/10; C08L53/00; C08K5/09; C08L27/00; C08L27/02; C08L27/04; C08L27/06
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) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |