Patent US2991292A successfully refreshed from Google Patents.
US2991292A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of dyestuff intermediates
Assignee: Bayer AG
•
Filing: 1958-03-18
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Granted: 1961-07-04
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Expires: 1978-03-18
Abstract
No abstract record available.
Inventors
- 👤 Degener Eberhard
- 👤 Petersen Siegfried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:52
CPC Classifications
C; C09; C09B; C09B47/00; C07; C07D; C07D339/00; C07D339/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
11 words
A PROCESS FOR THE PRODUCTION OF A COMPOUND OF THE FORMULA
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |