US2740796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid wool dyestuffs of the anthraquinone series
Assignee: Bayer AG
•
Filing: 1953-04-08
•
Granted: 1956-04-03
•
Expires: 1973-04-08
Abstract
No abstract record available.
Inventors
- 👤 Singer Josef
- 👤 Schwechten Heinz-Werner
- 👤 Bayer Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:21
CPC Classifications
C; C09; C09B; C09B1/00; C09B1/16; C09B1/20; C09B1/26; C09B1/28; C09B1/30; C09B1/303
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
NEW COMPOUNDS OF THE GENERAL FORMULA
Claim 2
Dependent Claim
6 words
NEW COMPOUNDS OF THE GENERAL FORMULA
References Cited (Backward Citations)
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Cited
US2067469A
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US2541623A
Cited
US2430771A
Cited
US2453285A
Cited
US2517613A
Cited
US2616900A
Cited
US2659736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |