US3679635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operation of polyamide continuous polymerization system
Assignee: Celanese Corp
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Filing: 1970-07-08
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Granted: 1972-07-25
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Expires: 1990-07-08
Abstract
Abstract POLYAMIDE CONTINOUS POLYMERIZATION SYSTEM IS OPERATED BY MAINTAINING INERT, SUBSTANTIALLY OXYGEN-FREE BLANKETS THROUGH THE SYSTEM DURING START-UP AND SHUTDOWN PERIODS.
Inventors
- 👤 Bruce W Portus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:38
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |