US3739005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of aromatic polyisocyanates by catalytic carbonylation ofnitro compounds
Assignee: Shell USA Inc
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Filing: 1971-12-13
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Granted: 1973-06-12
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Expires: 1991-12-13
Abstract
Abstract AN IMPROVED PROCESS FOR PREPARING CARBOCYCLIC AROMATIC ISOCYANATES COMPRISES CONTACTING A CARBOCYCLIC AROMATIC POLYNITRO COMPOUND WITH CARBON MONOXIDE IN THE PRESENCE OF A CATALYST SYSTEM CONSISTING OF CERTAIN NOBLE METAL HALIDES, AN ORGANIC ISOCYANIDE AND AT LEAST ONE COMPOUND SELECTED FROM THE GROUP CONSISTING OF IRON MOLYBDATE, MANGANESE MOLYBDATE AND IRON BORATE.
Inventors
- 👤 Clure J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:32
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |