US3544615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of crude cyanoalkylated polyoxyalkylene compounds
Assignee: Union Carbide Corp
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Filing: 1967-12-08
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Granted: 1970-12-01
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Expires: 1987-12-08
Abstract
No abstract record available.
Inventors
- 👤 Fedor Poppelsdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:05
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/30; C07; C07C; C07C209/00; C07C209/44; C07C209/48; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5024; C08G65/32; C08G65/329; C08G65/333; C08G65/33365; C08G65/33368; C08G65/33372; C08G69/00; C08G69/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3255253A
Cited
US3405162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |