Patent US1996989A successfully refreshed from Google Patents.
US1996989A
Expired / Lapsed
US
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Production of artificial filaments
Assignee: Zellsloff Fabrik Waldhof AG
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Filing: 1929-07-12
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Granted: 1935-04-09
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Expires: 1949-07-12
Abstract
No abstract record available.
Inventors
- 👤 Bernstein Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:42
CPC Classifications
E; E04; E04H; E04H7/00; E04H7/02; E04H7/18; C; C01; C01B; C01B23/00; D; D01; D01D; D01D10/00; D01D10/06; D01D5/00; D01D5/06; D01F; D01F2/00; D01F2/06
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) | 1938-04-08 | 1938-10-08 | 1939-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-04-08 | 1942-10-08 | 1943-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-04-08 | 1946-10-08 | 1947-04-09 | $7700.00 | Window Closed / Lapsed |