Patent US3516972A successfully refreshed from Google Patents.
US3516972A
Expired / Lapsed
US
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Process for the preparation of polyamides in finely divided form
Assignee: Chemische Werke Witten GmbH
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Filing: 1967-03-30
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Granted: 1970-06-23
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Expires: 1987-03-30
Abstract
No abstract record available.
Inventors
- 👤 Wolfgang Wolfes
- 👤 Gustav Renckhoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:02
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C08G69/30; C08G69/34; Y; Y10; Y10S; Y10S524/00; Y10S524/904
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) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |