Patent US2909510A successfully refreshed from Google Patents.
US2909510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Propylene polymerization process
Assignee: Hercules Powder Co
•
Filing: 1958-11-20
•
Granted: 1959-10-20
•
Expires: 1978-11-20
Abstract
No abstract record available.
Inventors
- 👤 Thomas Walter William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:31
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/04; C08F10/06; Y; Y10; Y10S; Y10S526/00; Y10S526/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE PROCESS OF POLYMERIZING PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE WITH AT LEAST A CATALYTIC AMOUNT OF A CATALYST FORMED BY MIXING TITANIUM TRICHLORIDE WITH AN ACITIVATOR SELECTED FROM THE GROUP CONSISTING OF DIALKYLALUMINUM HALIDE AND MIXTURES OF DIALKYLALUMINUM HALIDES WITH TRIALKYLALUMINUMS AND WITH AT LEAST ABOUT 0.2 MOLE OF AN ALKALI METAL HALIDE PER MOLE OF DIALKYLALUIMINUM HALIDE.
Claim 2
Dependent Claim
58 words
THE PROCESS OF POLYMERIZING PROPYLENE WHICH COMPRISES CONTACTING PROPYLENE WITH AT LEAST A CATALYTIC AMOUNT OF A CATALYST FORMED BY MIXING TITANIUM TRICHLORIDE WITH AN ACITIVATOR SELECTED FROM THE GROUP CONSISTING OF DIALKYLALUMINUM HALIDE AND MIXTURES OF DIALKYLALUMINUM HALIDES WITH TRIALKYLALUMINUMS AND WITH AT LEAST ABOUT 0.2 MOLE OF AN ALKALI METAL HALIDE PER MOLE OF DIALKYLALUIMINUM HALIDE.
References Cited (Backward Citations)
US2840551A
Cited
US2846427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |