US3577403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
1,1-bis-(4-(1'-benzyl-3'-methyl-pyrazalone-azo)phenyl)cyclohexane
Assignee: Bayer AG
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Filing: 1967-12-12
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Granted: 1971-05-04
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Expires: 1987-12-12
Abstract
Abstract A WATER-INSOLUBLE DIAZO DYESTUFF PARTICULARLY ADVANTAGEOUS IN THE DYEING OF INKS AND PASTES FOR BALL POINT PENS IS PRODUCED BY COUPLING 1-BENZYL-3-METHYL-PYRAZOLONE WITH 1,1-BIS-(4-AMINOPHENYL)CYCLOHEXANE.
Inventors
- 👤 Hans Raab
- 👤 Gunter Hagelloch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:06
CPC Classifications
C; C09; C09B; C09B35/00; C09B35/02; C09B35/021; C09B35/03
Claims Analysis
Total Claims: 0
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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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |