US3634382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Granular propylene polymers
Assignee: BASF SE
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Filing: 1969-08-01
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Granted: 1972-01-11
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Expires: 1989-08-01
Abstract
Abstract PRODUCTION OF GRANULAR PROPYLENE POLYMERS IN WHICH (1) PROPYLENE IS POLYMERIZED BY MEANS OF A ZIEGLER-NATTA CATALYST IN THE ABSENCE OF SOLVENTS OR DILUENTS SO THAT A POWDERED POLYMER IS DIRECTLY OBATINED WHICH HAS SPECIAL SPECIFICATION, (2) THIS POLYMER IS GIVEN A THERMAL AND MECHANICAL AFTERTREATMENT IN A SPECAIL WAY WITHOUT THE CATALYST HAVING BEEN PREVIOUSLY DEACTVATED, AND (3) THE POLYMER THUS AFTERTREATED IS HOMOGENIZED, EXTRUDED AND GRANLUATED BY CONVENTIONAL METHODS. THE POLYMER OBTAINES IS PARTICULARLY EASY TO PROCESS.
Inventors
- 👤 Hans-Georg Trieschmann
- 👤 Wolfgang Rau
- 👤 Heinz Mueller-Tamm
- 👤 Helmut Pfannmueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:58
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F110/00; C08F110/04; C08F110/06; C08F8/00; C08F8/50; C08F2810/00; C08F2810/10; C08J2323/00; C08J2323/02; C08J2323/10; C08J2323/12; Y; Y10; Y10S; Y10S526/00; Y10S526/909
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |