US2067463A
Expired / Lapsed
US
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Nu-long chain alkyl aromatic amino sulphonic acids and process of producing same
Assignee: "unichem" Chemikalien Handels A-G
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Filing: 1933-04-03
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Granted: 1937-01-12
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Expires: 1953-04-03
Abstract
No abstract record available.
Inventors
- 👤 Erik Schirm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:33
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/402; D06M13/438; C; C09; C09K; C09K23/00; C09K23/04; C09B; C09B67/00; C09B67/0071; C11; C11D; C11D1/00; C11D1/02; C11D1/12; C11D1/18; C11D1/88; 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) | 1940-01-12 | 1940-07-13 | 1941-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-01-12 | 1944-07-13 | 1945-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-01-12 | 1948-07-13 | 1949-01-12 | $7700.00 | Window Closed / Lapsed |