US2530409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for polymerizing styrene
Assignee: Dow Chemical Co
•
Filing: 1948-05-27
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Granted: 1950-11-21
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Expires: 1968-05-27
Abstract
No abstract record available.
Inventors
- 👤 Kenneth E Stober
- 👤 Amos James Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:53
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; Y; Y10; Y10S; Y10S159/00; Y10S159/10; Y10S526/00; Y10S526/918
Claims Analysis
Total Claims: 0
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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) | 1953-11-20 | 1954-05-22 | 1954-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-20 | 1958-05-22 | 1958-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-20 | 1962-05-22 | 1962-11-21 | $7700.00 | Window Closed / Lapsed |