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Patent US3547836A successfully refreshed from Google Patents.
US3547836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of expanded polyamides
Assignee: BASF SE
•
Filing: 1961-09-25
•
Granted: 1970-12-15
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 Horst Brueggemann
- 👤 Karl Dachs
- 👤 Erich Schwartz
- 👤 Hans Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:33
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J2377/00; C08J2377/02; Y; Y10; Y10S; Y10S264/00; Y10S264/56
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-14 | 1974-06-15 | 1974-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-14 | 1978-06-15 | 1978-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-14 | 1982-06-15 | 1982-12-15 | $7700.00 | Window Closed / Lapsed |