Patent US2521675A successfully refreshed from Google Patents.
US2521675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interpolymerization of styrene, alpha-methylstyrene, and oxidized soyabean oil
Assignee: Dow Chemical Co
•
Filing: 1949-02-21
•
Granted: 1950-09-12
•
Expires: 1969-02-21
Abstract
No abstract record available.
Inventors
- 👤 Harold M Hoogsteen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:22
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F242/00; C09; C09D; C09D125/00; C09D125/02; C09D125/04; C09D125/08; C09D125/14; C08F212/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A METHOD WHICH COMPRISES POLYMERIZING TOGETHER AT TEMPERATURES BETWEEN 100* AND 300*C. FROM 20 TO 80 PARTS BY WEIGHT OF AIR-BLOWN SOYABEAN OIL, CONTAINING FROM 16.3 TO 18.5 PER CENT BY WEIGHT OF CHEMICALLY COMBINED OXYGEN, AND A TOTAL OF FROM 80 TO 20 PARTS OF STYRENE ND ALPHAMETHYLSTYRENE IN RELATIVE PROPORTIONS SUCH THAT THE PROPORTION OF THE ALPHA-METHYLSTYRENE CORRESPONDS TO BETWEEN 10 TO 40 PER CENT OF THE COMBINED WEIGHT OF THE SAME AND THE STYRENE WHILE HAVING A METAL SALT PAINT DRIER DISSOLVED IN THE POLYMERIZATION MIXTURE.
Claim 2
Independent Claim
89 words
A METHOD WHICH COMPRISES POLYMERIZING TOGETHER AT TEMPERATURES BETWEEN 100* AND 300*C. FROM 20 TO 80 PARTS BY WEIGHT OF AIR-BLOWN SOYABEAN OIL, CONTAINING FROM 16.3 TO 18.5 PER CENT BY WEIGHT OF CHEMICALLY COMBINED OXYGEN, AND A TOTAL OF FROM 80 TO 20 PARTS OF STYRENE ND ALPHAMETHYLSTYRENE IN RELATIVE PROPORTIONS SUCH THAT THE PROPORTION OF THE ALPHA-METHYLSTYRENE CORRESPONDS TO BETWEEN 10 TO 40 PER CENT OF THE COMBINED WEIGHT OF THE SAME AND THE STYRENE WHILE HAVING A METAL SALT PAINT DRIER DISSOLVED IN THE POLYMERIZATION MIXTURE.
References Cited (Backward Citations)
US2468748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-11 | 1954-03-13 | 1954-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-11 | 1958-03-13 | 1958-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-11 | 1962-03-13 | 1962-09-12 | $7700.00 | Window Closed / Lapsed |