US2507338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of alpha alkyl styrenes
Assignee: Atlantic Richfield Co
•
Filing: 1945-06-09
•
Granted: 1950-05-09
•
Expires: 1965-06-09
Abstract
No abstract record available.
Inventors
- 👤 Randall G Heiligmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:51
CPC Classifications
C; C08; C08F; C08F112/00; C08F112/02; C08F112/04; C08F112/06; C08F112/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR HOMOPOLYMERIZING NON-NUCLEARLY SUBSTITUTED ALPHA ALKYL STYRENES AND MONOALKYL NUCLERLY SUBSTITUTED ALPHA ALKYL STYRENES IN WHICH THE ALKYL GROUP CONTAINS NOT MORE THAN 3 CARBON ATOMS TO SOLID RESINS HAVING A MOLECULAR WEIGHT OF AT LEAST 21,000, WHICH COMPRISES CONTACTING A SOLUTION OF SAID ALPHA ALKYL STYRENE IN 6 TO 25 VOLUMES OF A LIQUEFIED NORMAL MONOOLEFIN HAVING 2 TO 4 CARBON ATOMS WITH 0.25% TO 5% OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE BETWEEN -50*C. AND 100*C.
Claim 2
Dependent Claim
80 words
A PROCESS FOR HOMOPOLYMERIZING NON-NUCLEARLY SUBSTITUTED ALPHA ALKYL STYRENES AND MONOALKYL NUCLERLY SUBSTITUTED ALPHA ALKYL STYRENES IN WHICH THE ALKYL GROUP CONTAINS NOT MORE THAN 3 CARBON ATOMS TO SOLID RESINS HAVING A MOLECULAR WEIGHT OF AT LEAST 21,000, WHICH COMPRISES CONTACTING A SOLUTION OF SAID ALPHA ALKYL STYRENE IN 6 TO 25 VOLUMES OF A LIQUEFIED NORMAL MONOOLEFIN HAVING 2 TO 4 CARBON ATOMS WITH 0.25% TO 5% OF A FRIEDEL-CRAFTS CATALYST AT A TEMPERATURE BETWEEN -50*C. AND 100*C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-05-08 | 1953-11-07 | 1954-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-08 | 1957-11-07 | 1958-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-08 | 1961-11-07 | 1962-05-09 | $7700.00 | Window Closed / Lapsed |