US3173904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of solid olefin polymers
Assignee: —
•
Filing: —
•
Granted: 1965-03-16
•
Expires: 1982-03-16
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:26
CPC Classifications
C; C08; C08F; C08F10/00; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
IN A PROCESS FOR THE PREPARATION OF A NORMALLY SOLID POLYMER OF AN OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, PROPYLENE, BUTENE-1 AND MIXTURES THEREOF, WHEREIN SAID POLYMER IS OBTAINED AS AN EXTRUDED GEL CONTAINING A SUBSTANTIALLY INERT, HIGH BOILING LIQUID HYDROCARBON REACTION MEDIUM HAVING A MID-BOILING POINT WITHIN THE RANGE OF ABOUT 200 TO ABOUT 480*F., THE IMPROVED STEP WHEREBY SAID NORMALLY SOLID OLEFIN POLYMER IS RECOVERED IN HIGH PURITY WHICH COMPRISES: EXTRACTING THE EXTRUDED GEL WITH A PARAFFINIC SOLVENT HAVING A BOILING POINT LOWER THAN THE MID-BOILING POINT OF SAID REACTION MEDIUM, TO REMOVE SAID REACTION MEDIUM AND ANY "GREASE," AND THEREAFTER RECOVERING NORMALLY SOLID OLEFIN POLYMERS.
Claim 2
Dependent Claim
110 words
IN A PROCESS FOR THE PREPARATION OF A NORMALLY SOLID POLYMER OF AN OLEFIN SELECTED FROM THE GROUP CONSISTING OF ETHYLENE, PROPYLENE, BUTENE-1 AND MIXTURES THEREOF, WHEREIN SAID POLYMER IS OBTAINED AS AN EXTRUDED GEL CONTAINING A SUBSTANTIALLY INERT, HIGH BOILING LIQUID HYDROCARBON REACTION MEDIUM HAVING A MID-BOILING POINT WITHIN THE RANGE OF ABOUT 200 TO ABOUT 480*F., THE IMPROVED STEP WHEREBY SAID NORMALLY SOLID OLEFIN POLYMER IS RECOVERED IN HIGH PURITY WHICH COMPRISES: EXTRACTING THE EXTRUDED GEL WITH A PARAFFINIC SOLVENT HAVING A BOILING POINT LOWER THAN THE MID-BOILING POINT OF SAID REACTION MEDIUM, TO REMOVE SAID REACTION MEDIUM AND ANY "GREASE," AND THEREAFTER RECOVERING NORMALLY SOLID OLEFIN POLYMERS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |