US2194419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic amidines and process of producing them
Assignee: IG Farbenindustrie AG
•
Filing: 1938-06-29
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Granted: 1940-03-19
•
Expires: 1958-06-29
Abstract
No abstract record available.
Inventors
- 👤 Chwala August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:51
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/06; C07D233/08; D; D06; D06P; D06P1/00; D06P1/44; D06P1/64; D06P1/642; D06P1/6426
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) | 1943-03-19 | 1943-09-18 | 1944-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-03-19 | 1947-09-18 | 1948-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-03-19 | 1951-09-18 | 1952-03-19 | $7700.00 | Window Closed / Lapsed |