US2168947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs of the anthraquinone series
Assignee: General Aniline Works Inc
•
Filing: 1938-01-27
•
Granted: 1939-08-08
•
Expires: 1958-01-27
Abstract
No abstract record available.
Inventors
- 👤 Zerweck Werner
- 👤 Heinrich Ernst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:45
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/36; C09B1/473; C09B1/26; C09B1/28; C09B1/285; C09B1/30; C09B1/303; C09B1/40; C09B1/42; C09B1/50; C09B1/54; C09B1/545
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1942-08-07 | 1943-02-06 | 1943-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-08-07 | 1947-02-06 | 1947-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-08-07 | 1951-02-06 | 1951-08-08 | $7700.00 | Window Closed / Lapsed |