US3260750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing hydrazobenzenes
Assignee: Pharmacia and Upjohn Co
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Filing: 1963-10-14
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Granted: 1966-07-12
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 Aduan A R Sayigh
- 👤 Odinak Alec
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
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
IN A PROCESS FOR THE PRODUCTION OF AN O,O''-DI(LOWERALKYL)HYDRAZOBENZENE BY CATALYTIC HYDROGENATION OF THE CORRESPONDING O-(LOWER-ALKYL)NITROBENZENE IN THE PRESENCE OF A NOBLE METAL HYDROGENATION CATALYST AND AN ALKALI METAL HYDROXIDE THE IMPROVEMENT WHICH COMPRISES INITIALLY MAINTAINING THE TEMPERATURE OF THE REACTION MIXTURE WITHIN THE RANGE OF ABOUT 0* C. TO ABOUT 40* C. UNTIL THE AMOUNT OF HYDROGEN CONSUMED CORRESPONDS TO APPROXIMATELY 1.5 MOLES PER MOLE OF STARTING O-(LOWER-ALKYL)NITROBENZENE, AND THEREUPON RAISING THE REACTION TEMPERATURE TO BETWEEN ABOUT 60* C. AND ABOUT 100* C. UNTIL FURTHER UPTAKE OF HYDROGEN CEASES.
Claim 2
Dependent Claim
90 words
IN A PROCESS FOR THE PRODUCTION OF AN O,O''-DI(LOWERALKYL)HYDRAZOBENZENE BY CATALYTIC HYDROGENATION OF THE CORRESPONDING O-(LOWER-ALKYL)NITROBENZENE IN THE PRESENCE OF A NOBLE METAL HYDROGENATION CATALYST AND AN ALKALI METAL HYDROXIDE THE IMPROVEMENT WHICH COMPRISES INITIALLY MAINTAINING THE TEMPERATURE OF THE REACTION MIXTURE WITHIN THE RANGE OF ABOUT 0* C. TO ABOUT 40* C. UNTIL THE AMOUNT OF HYDROGEN CONSUMED CORRESPONDS TO APPROXIMATELY 1.5 MOLES PER MOLE OF STARTING O-(LOWER-ALKYL)NITROBENZENE, AND THEREUPON RAISING THE REACTION TEMPERATURE TO BETWEEN ABOUT 60* C. AND ABOUT 100* C. UNTIL FURTHER UPTAKE OF HYDROGEN CEASES.
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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |