US3598885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of low molecular weight polymers
Assignee: Standard Oil Co
•
Filing: 1968-07-11
•
Granted: 1971-08-10
•
Expires: 1988-07-11
Abstract
Abstract LOW MOLECULAR WEIGHT POLYMERS ARE PREPARED BY POLYMERIZATION OF 1-OLEFINS THROUGH METHODS WHICH LEAD TO RELATIVELY THERMALLY STABLE POLYMERS OF HIGH MOLECULAR WEIGHT WHICH ARE INTIMATELY MIXED WITH RELATIVELY THERMALLY UNSTABLE POLYMERS TO PRODUCE AN ADMIXTURE OF THE TWO POLYMERS WHICH IS THEN SUBJECTED TO THERMAL CRACKING, FOLLOWING WHICH A LOWER MOLECULAR WEIGHT POLYMER CRACKED FROM THE RELATIVELY STABLE HIGH MOLECULAR WEIGHT POLYMER CAN BE RECOVERED. A DESIRABLE METHOD FOR OBTAINING THE INTIMATE ADMIXTURE IS PREPARATION OF THE HIGH MOLECULAR WEIGHT POLYMER IN A REACTION SYSTEM CONTAINING THE RELATIVELY THERMALLY UNSTABLE POLYMER.
Inventors
- 👤 Edwin F Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:06
CPC Classifications
C; C08; C08F; C08F255/00; C08F257/00; C08F257/02; C08F8/00; C08F8/50
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |