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US2200220A
Expired / Lapsed
US
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Nu-substituted aspartic acids and their functional derivatives and process of producig them
Assignee: IG Farbenindustrie AG
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Filing: 1937-06-03
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Granted: 1940-05-07
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Expires: 1957-06-03
Abstract
No abstract record available.
Inventors
- 👤 Reppe Walter
- 👤 Ufer Hanns
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:57
CPC Classifications
C; C07; C07C; C07C229/00; C07C229/02; C07C229/04; C07C229/24; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09B1/285
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 |