US2021927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium nitrate
Assignee: IG Farbenindustrie AG
•
Filing: 1932-07-29
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Granted: 1935-11-26
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Expires: 1952-07-29
Abstract
No abstract record available.
Inventors
- 👤 Strathmeyer Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:00
CPC Classifications
C; C05; C05C; C05C1/00; C05C1/02; C01; C01D; C01D9/00; C01D9/18
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) | 1938-11-25 | 1939-05-27 | 1939-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-25 | 1943-05-27 | 1943-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-25 | 1947-05-27 | 1947-11-26 | $7700.00 | Window Closed / Lapsed |