US1843634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal compounds of azo-dyestuffs and process of making same
Assignee: FIRM SOCIETY OF CHEMICAL INDUSTRY IN BASLE
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Filing: 1929-03-08
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Granted: 1932-02-02
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Expires: 1949-03-08
Abstract
No abstract record available.
Inventors
- 👤 Straub Fritz
- 👤 Anderau Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
C; C09; C09B; C09B45/00; C09B45/02; C09B45/24; C09B45/26; C09B33/00; C09B33/18; C09B33/22; C09B45/28
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) | 1935-02-01 | 1935-08-03 | 1936-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-02-01 | 1939-08-03 | 1940-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-02-01 | 1943-08-03 | 1944-02-02 | $7700.00 | Window Closed / Lapsed |