US3644592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene polymer composition containing small amounts of urea phthalic anhydride and pvc
Assignee: Phillips Petroleum Co
•
Filing: 1969-12-29
•
Granted: 1972-02-22
•
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 00:55
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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 |