US2744935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of hydrazobenzenes
Assignee: BASF Schweiz AG
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Filing: 1952-12-15
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Granted: 1956-05-08
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Expires: 1972-12-15
Abstract
No abstract record available.
Inventors
- 👤 Johner Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:35
CPC Classifications
C; C07; C07C; C07C241/00; C07C241/02; C07C209/00; C07C209/30; C07C209/32; C07C209/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
IN A PROCESS FOR THE PREPARATION OF A HYRAZOBENZENE BY ALKALINE REDUCTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITROBENZENE, 2-METHYL-1-NITROBENZENE AND 2-METHOXY 1-NITROBENZENE AND THE CORRESPONDING AZOXY AND AZO COMPOUNDS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REDUCTION BY MEANS OF MATELLIC IRON CONTAINING AN OXYGEN-FREE IRON COMPOUND OF AT LEAST ONE OF THE ELEMENTS SILICON AND CARBON, AND ADDING TO THE REACTION MIXTURE AT LEAST ABOUT ONE MOLD OF ALKALI HYDROXIDE FOR EACH REDUCTION EQUIVALENT REQUIRED.
Claim 2
Dependent Claim
80 words
IN A PROCESS FOR THE PREPARATION OF A HYRAZOBENZENE BY ALKALINE REDUCTION OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF NITROBENZENE, 2-METHYL-1-NITROBENZENE AND 2-METHOXY 1-NITROBENZENE AND THE CORRESPONDING AZOXY AND AZO COMPOUNDS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REDUCTION BY MEANS OF MATELLIC IRON CONTAINING AN OXYGEN-FREE IRON COMPOUND OF AT LEAST ONE OF THE ELEMENTS SILICON AND CARBON, AND ADDING TO THE REACTION MIXTURE AT LEAST ABOUT ONE MOLD OF ALKALI HYDROXIDE FOR EACH REDUCTION EQUIVALENT REQUIRED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |