US3776979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin block copolymer fluidized-bed polymerization process
Assignee: Gulf Research and Development Co
•
Filing: 1971-11-05
•
Granted: 1973-12-04
•
Expires: 1991-11-05
Abstract
Abstract OLEFIN BLOCK COPOLYMERS ARE PREPARED BY A FLUIDIZED-BED POLYMERIZATION PROCESS WHEREIN A VAPOROUS FEED IS PASSED UPWARDLY THROUGH MULTIPLE REACTION ZONES IN INTIMATE CONTACT WITH DOWNWARDLY FLOWING FLUIDIZED CATALYST AND POLYMER PARTICLES, OLEFIN A BEING CONTINUOUSLY INTRODUCED INTO AN UPPER POLYMERIZATION ZONE, OLEFIN B BEING CONTINUOUSLY INTRODUCED INTO A LOWER POLYMERIZATION ZONE, AND A A-B BLOCK COPOLYMER PRODUCT BEING CONTINUOUSLY WITHDRAWN FROM THE LOWEST POLYMERIZATION ZONE.
Inventors
- 👤 R Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:59
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; B; B01; B01J; B01J8/00; B01J8/18; B01J8/1818; B01J8/1827; B01J8/24; B01J8/26; B01J8/28; Y; Y10; Y10S; Y10S525/00; Y10S525/91
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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |