US1822065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dyestuff components and process of preparing them
Assignee: Kalle GmbH and Co KG
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Filing: 1929-10-14
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Granted: 1931-09-08
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Expires: 1949-10-14
Abstract
No abstract record available.
Inventors
- 👤 Sprongerts Eduard
- 👤 Schmidt Maximilian Paul
- 👤 Franke Robert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:39
CPC Classifications
C; C07; C07C; C07C279/00; C07C279/20; C07C279/24; C07C279/26
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) | 1934-09-07 | 1935-03-09 | 1935-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-09-07 | 1939-03-09 | 1939-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-09-07 | 1943-03-09 | 1943-09-08 | $7700.00 | Window Closed / Lapsed |