US2570866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of nitroaryl compounds
Assignee: GAF Chemicals Corp
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Filing: 1948-10-19
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Granted: 1951-10-09
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Expires: 1968-10-19
Abstract
No abstract record available.
Inventors
- 👤 Donald E Sargent
- 👤 Jr George Wesley Pedlow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:51
CPC Classifications
C; C07; C07C; C07C241/00; C07C241/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
IN THE PROCESS OF REDUCING NITROAROMATIC COMPOUNDS TO THE CORRESPONDING HYDRAZO AROMATIC COMPOUND BY TREATMENT WITH A REDUCING AGENT IN THE PRESENCE OF AN ALKALINE MEDIUM, THE IMPROVEMENT COMPRISING EMPLOYING AS THE REDUCING AGENT ALUMINUM AND A SMALL QUANTITY OF AN ALKALI-METAL ZINCATE FORMED FROM A ZINC COMPOUND SELECTED FROM THE GROUP CONSISTING OF ZINC, ZINC OXIDE, ZINC HYDROXIDE, ZINC SULFATE, ZINC CHLORIDE, ZINC NITRATE, ZINC ACETATE AND ZINC OXALATE.
Claim 2
Dependent Claim
59 words
THE PROCESS OF REDUCING NITROBENZOIC ACID TO HYDRAZOBENCOIC ACID WHICH COMPRISES GRADUALLY ADDING ALUMINUM TO AN AQUEOUS MIXTURE COMPRISING NITROBENZOIC ACID, SODIU M HYDROXIDE, CADMIUM SULFATE AND A SMALL QUANTITY OF ZINC OXIDE, AND MAINTAINING THE TEMPERATURE OF THE MIXTURE AT FROM ABOUT 100 TO ABOUT 106* C. DURING AN AFTER SAID ADDITION UNTIL THE DESIRED REDUCTION IS COMPLETE.
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) | 1954-10-08 | 1955-04-09 | 1955-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-08 | 1959-04-09 | 1959-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-08 | 1963-04-09 | 1963-10-09 | $7700.00 | Window Closed / Lapsed |