US2688646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-stage olefinic polymerization process
Assignee: Standard Oil Development Co
•
Filing: 1950-07-27
•
Granted: 1954-09-07
•
Expires: 1970-07-27
Abstract
No abstract record available.
Inventors
- 👤 Francis R Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:16
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
A TWO-STAGE PROCESS FOR POLYMERIZING OLEFINS WHICH COMPRISES THE STEPS OF MAINTAINING A SLURRY OF FINELY DIVIDED, SOLID POLYMERIZATION CATALYST IN A HYDROCARBON PHASE COMPRISING OLEFINS IN BOTH A PRIMARY AND AT LEAST ONE SECONDARY REACTION ZONE, SAID SECONDARY ZONE BEING SUBSTANTIALLY COMPLETELY SUBMERGED IN SLURRY IN SAID FIRST ZONE WHEREBY HEAT TRANSFER BETWEEN SAID ZONES IS OBTAINED, AGITATING THE SLURRY IN SAID PRIMARY ZONE UNDER CONDITIONS WHEREBY A PORTION OF THE OLEFINS ARE POLYMERIZED AND WHERE-
References Cited (Backward Citations)
US2179829A
Cited
US2515156A
Cited
US2450547A
Cited
US2425969A
Cited
US2419097A
Cited
US2419088A
Cited
US2432298A
Cited
US2501695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |