Patent US2199780A successfully refreshed from Google Patents.
US2199780A
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Imidazolines containing sulphuric acid radicals and process of preparing them
Assignee: IG Farbenindustrie AG
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Filing: 1939-05-04
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Granted: 1940-05-07
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Expires: 1959-05-04
Abstract
No abstract record available.
Inventors
- 👤 Chwala August
- 👤 Waldmann Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:26
CPC Classifications
C; C07; C07D; C07D233/00; C07D233/04; C07D233/06; C07D233/08; C07D233/12; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/05
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) | 1943-05-07 | 1943-11-06 | 1944-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-05-07 | 1947-11-06 | 1948-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-05-07 | 1951-11-06 | 1952-05-07 | $7700.00 | Window Closed / Lapsed |