US2144202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saponifying cellulose esters
Assignee: IG Farbenindustrie AG
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Filing: 1935-04-19
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Granted: 1939-01-17
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Expires: 1955-04-19
Abstract
No abstract record available.
Inventors
- 👤 Schlack Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:26
CPC Classifications
D; D06; D06P; D06P5/00; D06P5/22; D01; D01F; D01F2/00; D01F2/24; D01F2/28; D06M; D06M11/00; D06M11/32; D06M11/36; D06M11/38; D06M11/385
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) | 1942-01-16 | 1942-07-18 | 1943-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-01-16 | 1946-07-18 | 1947-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-01-16 | 1950-07-18 | 1951-01-17 | $7700.00 | Window Closed / Lapsed |