US2489226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making pigmented polystyrene
Assignee: Dow Chemical Co
•
Filing: 1947-10-10
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Granted: 1949-11-22
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Expires: 1967-10-10
Abstract
No abstract record available.
Inventors
- 👤 Earl D Morris
- 👤 Stevens S Drake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:14
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/20; C08J3/22; C08J3/226; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08; C08F257/00; C08F257/02; C08J2325/00; C08J2325/02; C08J2325/04; C08J2325/06; C08J2425/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2067234A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |