US3337475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the polymerization of olefin oxides
Assignee: Sumitomo Chemical Co Ltd
•
Filing: 1962-12-27
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Granted: 1967-08-22
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Expires: 1982-12-27
Abstract
No abstract record available.
Inventors
- 👤 Fukui Kenichi
- 👤 Yuasa Sachio
- 👤 Kagiya Tsutomu
- 👤 Shimizu Takeo
- 👤 Sano Takezo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:16
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/10; C08G65/12
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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |