Patent US3558684A successfully refreshed from Google Patents.
US3558684A
Expired / Lapsed
US
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Process for the manufacture of alkenyl isocyanates
Assignee: Cassella Farbwerke Mainkur AG
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Filing: 1968-01-16
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Granted: 1971-01-26
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Expires: 1988-01-16
Abstract
Abstract PREPARATION OF ALPHA-BETA ALKENYL ISOCYANATE BY REACTING CORRESPONDING ALKENYL HALIDE WITH CYANATE OF ALKALI METAL OR ALKALINE EARTH METAL IN APROTIC POLAR SOLVENT, IS SHARPLY IMPROVED BY ADDING TO THE REACTION MIXTURE A CATALYTIC QUANTITY OF METALLIC COPPER OR OF ACCEPTABLE CUPROUS COMPOUND SUCH AS THE HALIDES, ALONG WITH A SUB-STANTIALLY NON-POLAR INERT SOLVENT.
Inventors
- 👤 Hanswilli Von Brachel
- 👤 Erwin Herrmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:28
CPC Classifications
C; C07; C07C; C07C263/00
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |