US3130186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the dissociation of polypropylene
Assignee: Glanzstoff AG
•
Filing: 1961-08-04
•
Granted: 1964-04-21
•
Expires: 1981-08-04
Abstract
No abstract record available.
Inventors
- 👤 Siggel Erhard
- 👤 Meyer Gerhard
- 👤 Rosener Wolfgang
- 👤 Helmut Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:43
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR TREATING POLYPROPYLENE WHICH COMPRISES DISPERSING SAID POLYPROPYLENE IN AN ISO-ALCOHOL CONTAINING FROM 3 TO 8 CARBON ATOMS; PASSING OXYGEN INTO SAID DISPERSION WHILE MAINTAINING THE TEMPERATURE OF SAID DISPERSION AT FROM ABOUT 100*C. TO ABOUT 10*C. BELOW THE MELTING POINT OF THE POLYMERIZATE; AND THEREAFTER REMOVING SAID ISO-ALCOHOL FROM SAID POLYMERIZATE, SAID ISOALCOHOL HAVING DISSOLVED THEREIN ATACTIC POLYPROPYLENE AND LOW MOLECULAR WEIGHT BLOCK POLYMERS.
Claim 2
Dependent Claim
67 words
A PROCESS FOR TREATING POLYPROPYLENE WHICH COMPRISES DISPERSING SAID POLYPROPYLENE IN AN ISO-ALCOHOL CONTAINING FROM 3 TO 8 CARBON ATOMS; PASSING OXYGEN INTO SAID DISPERSION WHILE MAINTAINING THE TEMPERATURE OF SAID DISPERSION AT FROM ABOUT 100*C. TO ABOUT 10*C. BELOW THE MELTING POINT OF THE POLYMERIZATE; AND THEREAFTER REMOVING SAID ISO-ALCOHOL FROM SAID POLYMERIZATE, SAID ISOALCOHOL HAVING DISSOLVED THEREIN ATACTIC POLYPROPYLENE AND LOW MOLECULAR WEIGHT BLOCK POLYMERS.
References Cited (Backward Citations)
US2911398A
Cited
US2908671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |