US3737445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic carbonylation of aromatic nitroso compounds to prepare corresponding isocyanates
Assignee: Imperial Chemical Industries Ltd
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Filing: 1969-01-06
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Granted: 1973-06-05
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Expires: 1989-01-06
Abstract
Abstract AROMATIC ISOCYANATES ARE MANUFACTURED BY REACTING AN AROMATIC NITRO OR NITROSO COMPOUND WITH CARBON MONOXIDE IN THE PRESENCE OF A CATALYST WHICH IS A MIXTURE OF AT LEAST ONE NOBLE METAL SELECTED FROM RUTHENIUM, RHODIUM, PALLADIUM, OSMIUM, IRRIDIUM AND PLATINUM, OR A COMPOUND OF SUCH A METAL, AND A COMPOSITION COMPRISING TWO OR MORE HEAVY METALS IN THE FORM OF THEIR OXIDES, HYDROXIDES, CARBONATES, BISIC CARBONATES OR BASIC PHOSPHATES, OR MIXTURES THEREOF, THE SAID COMPOSITION HAVING BEEN PREPARED BY A PROCEDURE INCLUDING AS AN ESSENTIAL STEP EITHER A COPRECIPITATION FROM SOLUTION OF A HEATING TOGETHER OF THE HEAVY METALS AS THEIR HYDROXIDES OR THERMALLY UNSTABLE SALTS.
Inventors
- 👤 D Dodman
- 👤 K Pearson
- 👤 J Woolley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:13
CPC Classifications
A; A22; A22C; A22C25/00; A22C25/20; 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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |