Patent US1710992A successfully refreshed from Google Patents.
US1710992A
Expired / Lapsed
US
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Condensation products of the anthraquinone series and process of making same
Assignee: Grasselli Dyestuff Corp
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Filing: 1926-12-15
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Granted: 1929-04-30
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Expires: 1946-12-15
Abstract
No abstract record available.
Inventors
- 👤 Kranzlein Georg
- 👤 Corell Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
C; C07; C07D; C07D279/00; C07D279/10; C09; C09B; C09B1/00; C09B1/16; C09B1/56; C09B1/58; C09B1/60; C09B5/00; C09B5/24; C09B5/44; C09B5/60
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) | 1932-04-29 | 1932-10-29 | 1933-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-04-29 | 1936-10-29 | 1937-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-04-29 | 1940-10-29 | 1941-04-30 | $7700.00 | Window Closed / Lapsed |