US3816499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of isocyanates
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-09-11
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Granted: 1974-06-11
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Expires: 1992-09-11
Abstract
Abstract A PROCESS FOR THE MANUFACTURE OF A-ISOCYANATOALKYL BENZENOID COMPOUNDS CONTAINING ONE OR MORE A-ISOCYANATOALKYL GROUPS WHICH COMPRISES REACTING AN A-HALOALKYL BENZENOID COMPOUND WITH A CYANATE OF AN ALKALI METAL, AN AMMONIUM RADICAL OR AN ALKALINE EARTH METAL IN A KETONIC OR ALDEHYDE SOLVENT OF THE FORMULA R1COR2 WHERE R1 REPRESENTS METHYL OR HYDROGEN AND R2 REPRESENTS AN ARYL RADICAL OR AN ALKYL RADICAL CONTAINING UP TO 3 CARBON ATOMS IN THE PRESENCE OF PHOSPHORUS PENTOXIDE AND A WEAKLY BASIC ORGANIC TERTIARY NITROGEN COMPOUND.
Inventors
- 👤 G Beswick
- 👤 R Lindsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:02
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |