Patent US2733254A successfully refreshed from Google Patents.
US2733254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing organic
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:29
CPC Classifications
C; C07; C07C; C07C265/00; C07C265/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE METHOD OF PRODUCING ORGANIC ISOCYANATES, WHICH COMPRISES REACTING A CARBONYL HALIDE SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND CARBONYL BROMIDE WITH A HYDROHALIDE OF PRIMARY AMINE SELECTED FROM THE CLASS CONSISTING OF ALKYL-, CYCLOALKYL-, ALKARYL-, ARALKYL-, ARYL- AND HYDROARYL AMINES, SAID REACTION BEING CARRIED OUT IN THE PRESENCE OF AN INERT ORGANIC SOLVENT, A SUFFICIENT AMOUNT OF BORON TRIFLUORIDE CATALYST TO SUBSTANTIALLY INCREASE THE RATE OF REACTION OVER THAT OBTAINABLE WITHOUT THE USE OF SAID CATALYST AND AT A TEMPERATURE SUBSTANTIALLY IN THE RANGE OF FROM ABOUT 50* C. UP TO THAT TEMPERATURE AT WHICH THE MOST TIGHTLY BOUND BORON TRIFLUORIDE COMPLEX SUBSTANTIALLY COMPLETELY LIBERATES ITS BORON TRIFLUORIDE CONTENT, AND SAID REACTANTS BEING EMPLOYED IN AT LEAST THE MOLAR RATIO STOICHIOMETRICALLY REQUIRED TO SUBSTANTIALLY COMPLETELY CONVERT EACH AMINE HYDROHALIDE GROUP OF SAID PRIMARY AMINE HYDROHALIDE INTO ISOCYANATE GROUPS.
Claim 2
Independent Claim
140 words
THE METHOD OF PRODUCING ORGANIC ISOCYANATES, WHICH COMPRISES REACTING A CARBONYL HALIDE SELECTED FROM THE GROUP CONSISTING OF PHOSGENE AND CARBONYL BROMIDE WITH A HYDROHALIDE OF PRIMARY AMINE SELECTED FROM THE CLASS CONSISTING OF ALKYL-, CYCLOALKYL-, ALKARYL-, ARALKYL-, ARYL- AND HYDROARYL AMINES, SAID REACTION BEING CARRIED OUT IN THE PRESENCE OF AN INERT ORGANIC SOLVENT, A SUFFICIENT AMOUNT OF BORON TRIFLUORIDE CATALYST TO SUBSTANTIALLY INCREASE THE RATE OF REACTION OVER THAT OBTAINABLE WITHOUT THE USE OF SAID CATALYST AND AT A TEMPERATURE SUBSTANTIALLY IN THE RANGE OF FROM ABOUT 50* C. UP TO THAT TEMPERATURE AT WHICH THE MOST TIGHTLY BOUND BORON TRIFLUORIDE COMPLEX SUBSTANTIALLY COMPLETELY LIBERATES ITS BORON TRIFLUORIDE CONTENT, AND SAID REACTANTS BEING EMPLOYED IN AT LEAST THE MOLAR RATIO STOICHIOMETRICALLY REQUIRED TO SUBSTANTIALLY COMPLETELY CONVERT EACH AMINE HYDROHALIDE GROUP OF SAID PRIMARY AMINE HYDROHALIDE INTO ISOCYANATE GROUPS.
References Cited (Backward Citations)
US2362648A
Cited
US2564640A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |