US2521431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activation of friedel-crafts catalyst
Assignee: Standard Oil Development Co
•
Filing: 1948-07-08
•
Granted: 1950-09-05
•
Expires: 1968-07-08
Abstract
No abstract record available.
Inventors
- 👤 Jr David C Walsh
- 👤 Henry G Schutze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:55
CPC Classifications
C; C08; C08F; C08F210/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A PROCESS FOR POLYMERIZING A MIXTURE OF ANHYDROUS TERTIARY OLEFIN AND DIOLEFIN AT A TEMPPERATURE IN THE RANGE BETWEEN -50 AND-175* F. WHICH COMPRISES MAINTAINING SAID MIXTURE IN THE PRESENCE OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE IN THE RANGE OF -50 AND -175*F., SAID FRIEDEL-CRAFTS CATALYST HAVING BEEN DISSOLVED IN ALKYL HALIDE TO WHICH HAS BEEN ADDED AN AMOUNT OF WATER IN THE RANGE BETWEEN 0.01 AND 4 MOLS BASED ON THE FRIEDEL-CRAFTS CATALYST, FOR A SUFFICIENT INTERVAL OF TIME TO FORM A POLYMER, AND RECOVERING SAID POLYMER.
Claim 2
Dependent Claim
89 words
A PROCESS FOR POLYMERIZING A MIXTURE OF ANHYDROUS TERTIARY OLEFIN AND DIOLEFIN AT A TEMPPERATURE IN THE RANGE BETWEEN -50 AND-175* F. WHICH COMPRISES MAINTAINING SAID MIXTURE IN THE PRESENCE OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE IN THE RANGE OF -50 AND -175*F., SAID FRIEDEL-CRAFTS CATALYST HAVING BEEN DISSOLVED IN ALKYL HALIDE TO WHICH HAS BEEN ADDED AN AMOUNT OF WATER IN THE RANGE BETWEEN 0.01 AND 4 MOLS BASED ON THE FRIEDEL-CRAFTS CATALYST, FOR A SUFFICIENT INTERVAL OF TIME TO FORM A POLYMER, AND RECOVERING SAID POLYMER.
References Cited (Backward Citations)
US2433025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |