US2169515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carboxylic acid esters of aromatic sulphocarboxylic acids with hydroxy-alkylamides and process of making same
Assignee: BASF Schweiz AG
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Filing: 1937-10-08
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Granted: 1939-08-15
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Expires: 1957-10-08
Abstract
No abstract record available.
Inventors
- 👤 Albrecht Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:14
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/22; C07C309/00; C07C309/01; C07C309/28; C07C309/57; C07C309/58
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) | 1942-08-14 | 1943-02-13 | 1943-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-14 | 1947-02-13 | 1947-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-14 | 1951-02-13 | 1951-08-15 | $7700.00 | Window Closed / Lapsed |