Patent US1935929A successfully refreshed from Google Patents.
US1935929A
Expired / Lapsed
US
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Acid dyestuff of the anthraquinone series
Assignee: General Aniline Works Inc
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Filing: 1932-12-23
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Granted: 1933-11-21
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Expires: 1952-12-23
Abstract
No abstract record available.
Inventors
- 👤 Zahn Karl
- 👤 Koch Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:04
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/32; C09B1/34; C09B1/343
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) | 1936-11-20 | 1937-05-22 | 1937-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-11-20 | 1941-05-22 | 1941-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-11-20 | 1945-05-22 | 1945-11-21 | $7700.00 | Window Closed / Lapsed |