US2490178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of artificial sponges from viscose
Assignee: Akzona Inc
•
Filing: 1947-07-28
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Granted: 1949-12-06
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Expires: 1967-07-28
Abstract
No abstract record available.
Inventors
- 👤 Kroon Henricus Anthonius V Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:55
CPC Classifications
C; C08; C08J; C08J9/00; B; B29; B29C; B29C44/00; C08J2301/00; Y; Y10; Y10S; Y10S264/00; Y10S264/14; Y10S424/00; Y10S424/07
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) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |