Patent US2945849A successfully refreshed from Google Patents.
US2945849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo compounds containing a quaternary ammonium group
Assignee: Bayer AG
•
Filing: 1958-03-03
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Granted: 1960-07-19
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Expires: 1978-03-03
Abstract
No abstract record available.
Inventors
- 👤 Kruckenberg Winfried
- 👤 Weis Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:36
CPC Classifications
C; C09; C09B; C09B44/00; C09B44/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
A DISAZO DYESTUFF CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
7 words
A DISAZO DYESTUFF CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
US2099525A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |