Patent US2987513A successfully refreshed from Google Patents.
US2987513A
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Azo dyestuffs and process for their manufacture
Assignee: Bayer AG
•
Filing: 1958-12-09
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Granted: 1961-06-06
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Expires: 1978-12-09
Abstract
No abstract record available.
Inventors
- 👤 Schmidt Karl-Heinz
- 👤 Schundehutte Karl-Heinz
- 👤 Suckfull Fritz
- 👤 Nickel Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:00
CPC Classifications
C; C09; C09B; C09B43/00; C09B43/12; C09B45/00; C09B45/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
16 words
A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF AN O,O''-DIHYDROXY AZO DYESTUFF CORRESPONDING TO THE FORMULA
Claim 2
Dependent Claim
16 words
A DYESTUFF SELECTED FROM THE GROUP CONSISTING OF AN O,O''-DIHYDROXY AZO DYESTUFF CORRESPONDING TO THE FORMULA
References Cited (Backward Citations)
US2919269A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |