Patent US3173904A successfully refreshed from Google Patents.
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)
US2825721A
Cited
US2845410A
Cited
US2894824A
Cited
US2837504A
Cited
US2893984A
Cited
US2890214A
Cited
US2897184A
Cited
US2964513A
Cited
US2880201A
Cited
US2880199A
Cited
US2845414A
Cited
US2989516A
Cited
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 |