US2600000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of symmetrical diarylhydrazines
Assignee: Mathieson Chemical Corp
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Filing: 1949-12-28
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Granted: 1952-06-10
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Expires: 1969-12-28
Abstract
No abstract record available.
Inventors
- 👤 Kamlet Jonas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:20
CPC Classifications
C; C07; C07C; C07C241/00; C07C241/02; C07C245/00; C07C245/02; C07C245/06; C07C245/08; C07C291/00; C07C291/02; C07C291/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A PROCESS FOR THE MANUFACTURE OF SYMMETRICAL DIARYLHYDRAZINES WHICH COMPRISES THE STEPS OF : (A) REACTING AN AROMATIC NITRO COMPOUND CHOSEN FROM THE GROUP CONSISTING OF NITROBENZENE, ORTHO- AND META-NITROTOLUENE, ORTHOAND META-NITROANISOLE, ORTHO- AND META-NITROPHENETOLE WITH A MIXTURE OF SODIUM METHYLATE AND SODIUM HYDROXIDE AND SEPARATING THE RESULTANT AROMATIC AZOXY COMPOUND FROM THE CONCOMITANT SODIUM COMPOUNDS, AND (B) REDUCING THE AROMATIC AZOXY COMPOUND OBTAINED IN STEP (A) WITH A MEMBER OF THE GROUP CONSISTING OF SODIUM AND SODIUM AMALGAM IN THE PRESENCE OF METHANOL, SEPARATING THE RESULTANT SYMMETRICAL DIARYLHYDRAZINE FROM THE CONCOMITANT MIXTURE OF SODIUM METHYLATE AND SODIUM HYDROXIDE, AND RETURNING SAID MIXTURE OF SODIUM METHYLATE AND SODIUM HYDROXIDE TO THE FIRST STEP OF THE PROCESS FOR REDUCING THE AROMATIC NITRO COMPOUND TO THE AZOXY COMPOUND.
Claim 2
Dependent Claim
126 words
A PROCESS FOR THE MANUFACTURE OF SYMMETRICAL DIARYLHYDRAZINES WHICH COMPRISES THE STEPS OF : (A) REACTING AN AROMATIC NITRO COMPOUND CHOSEN FROM THE GROUP CONSISTING OF NITROBENZENE, ORTHO- AND META-NITROTOLUENE, ORTHOAND META-NITROANISOLE, ORTHO- AND META-NITROPHENETOLE WITH A MIXTURE OF SODIUM METHYLATE AND SODIUM HYDROXIDE AND SEPARATING THE RESULTANT AROMATIC AZOXY COMPOUND FROM THE CONCOMITANT SODIUM COMPOUNDS, AND (B) REDUCING THE AROMATIC AZOXY COMPOUND OBTAINED IN STEP (A) WITH A MEMBER OF THE GROUP CONSISTING OF SODIUM AND SODIUM AMALGAM IN THE PRESENCE OF METHANOL, SEPARATING THE RESULTANT SYMMETRICAL DIARYLHYDRAZINE FROM THE CONCOMITANT MIXTURE OF SODIUM METHYLATE AND SODIUM HYDROXIDE, AND RETURNING SAID MIXTURE OF SODIUM METHYLATE AND SODIUM HYDROXIDE TO THE FIRST STEP OF THE PROCESS FOR REDUCING THE AROMATIC NITRO COMPOUND TO THE AZOXY COMPOUND.
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) | 1955-06-10 | 1955-12-10 | 1956-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-10 | 1959-12-10 | 1960-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-10 | 1963-12-10 | 1964-06-10 | $7700.00 | Window Closed / Lapsed |