US2994697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New dyestuffs of the 1, 8-naphthalene dicarboxylic acid series
Assignee: Hoechst AG
•
Filing: 1958-04-15
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Granted: 1961-08-01
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Expires: 1978-04-15
Abstract
No abstract record available.
Inventors
- 👤 Eckert Wilhelm
- 👤 Fuchs Otto
- 👤 Raizner Friedrich
- 👤 Rentel Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:01
CPC Classifications
C; C09; C09B; C09B57/00; C09B57/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
THE DYESTUFF CORRESPONDING TO THE FOLLOWING FORMULA
Claim 2
Dependent Claim
7 words
THE DYESTUFF CORRESPONDING TO THE FOLLOWING FORMULA
References Cited (Backward Citations)
FR1111620A
Cited
US2820037A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |