US2353041A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuffs of the anthraquinone series
Assignee: EIDP Inc
•
Filing: 1940-10-24
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Granted: 1944-07-04
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Expires: 1960-10-24
Abstract
No abstract record available.
Inventors
- 👤 David X Klein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:08
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) | 1947-07-04 | 1948-01-03 | 1948-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-07-04 | 1952-01-03 | 1952-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-07-04 | 1956-01-03 | 1956-07-04 | $7700.00 | Window Closed / Lapsed |