Patent US3754014A successfully refreshed from Google Patents.
US3754014A
Expired / Lapsed
US
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Vapor phase reaction of aromatic nitro compounds to form aromatic isocyanates
Assignee: Olin Corp
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Filing: 1971-06-10
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Granted: 1973-08-21
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Expires: 1991-06-10
Abstract
Abstract IN A CONTINUOUS PROCESS FOR PREPARING AROMATIC ISOCYANATES FROM THE CORRESPONDING AROMATIC NITRO COMPOUNDS IN THE PRESENCE OF A CATALYST IN A REACTION ZONE AT AN ELEVATED TEMPERATURE, THE IMPROVEMENT WITH COMPRISES VAPORIZING SAID AROMATIC NITRO COMPOUND, MIXING SAID VAPOR WITH GASEOUS CARBON MONOXIDE, CONTACTING SAID MIXTURE WITH SAID CATALYST IN SAID REACTION ZONE, AND WITHDRAWING THE REACTION PRODUCT CONTAINING AROMATIC ISOCYANATE FROM SAID REACTION ZONE. CATALYSTS INCLUDE HALIDES AND OXIDES OF NOBLE METALS, PREFERABLY WHEN SUPPORTED ON SILICON CARBIDE. UTILIZING A HALIDE OF COPPER AS A CATALYST COMPONENT ALSO IMPROVES ISOCYANATE YIELDS.
Inventors
- 👤 E Kober
- 👤 R Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:22
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/14
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |