US3454536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyamides
Assignee: Chemische Werke Witten GmbH
•
Filing: 1965-09-24
•
Granted: 1969-07-08
•
Expires: 1985-09-24
Abstract
No abstract record available.
Inventors
- 👤 Gerhard Schade
- 👤 Franz Blaschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:56
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; C08G69/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2130523A
Cited
US2130948A
Cited
US2163636A
Cited
GB794365A
Cited
US3329653A
Cited
US3379695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-07 | 1973-01-06 | 1973-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-07 | 1977-01-06 | 1977-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-07 | 1981-01-06 | 1981-07-08 | $7700.00 | Window Closed / Lapsed |