US2136928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of amines of high molecular weight, which are rich in nitrogen
Assignee: IG Farbenindustrie AG
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Filing: 1935-12-09
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Granted: 1938-11-15
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Expires: 1955-12-09
Abstract
No abstract record available.
Inventors
- 👤 Schlack Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:13
CPC Classifications
C; C09; C09D; C09D7/00; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G73/00; C08G73/02; C09J; C09J187/00
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) | 1941-11-14 | 1942-05-16 | 1942-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-14 | 1946-05-16 | 1946-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-14 | 1950-05-16 | 1950-11-15 | $7700.00 | Window Closed / Lapsed |