Patent US2908703A successfully refreshed from Google Patents.
US2908703A
Expired / Lapsed
US
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Preparation of aromatic isocyanates
Assignee: Individual
•
Filing: 1955-08-16
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Granted: 1959-10-13
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Expires: 1975-08-16
Abstract
No abstract record available.
Inventors
- 👤 Harold K Latourette
- 👤 Oscar H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:21
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10; C07C263/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN A METHOD OF PREPARING AROMATIC ISOCYANATES BY REACTING, IN AN INERT ORGANIC SOLVENT, A STOICHIOMETRIC EXCESS OF PHOSGENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AROMATIC PRIMARY MONO-, DI-, AND POLYAMINES HAVING NO SUBSTITUENTS OTHER THAN PRIMARY AMINO WHICH ARE CAPABLE OF REACTING WITH PHOSGENE UNDER THE CONDITIONS EMPLOYED, TO FORM THE CORRESPONDING ISOCYANATE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE INITIAL PHOSGENATION AT A TEMPERATURE WITHIN THE RANGE OF 60*C. TO 90*C. TO PRODUCE AN INTERMEDIATE PRODUCT, WHICH CONTAINS AN ADMIXTURE OF THE DESIRED ISOCYANATE AND THE CORRESPONDING INTERMEDIATE CARBAMYL CHLORIDE, AND REACTING SAID INTERMEDIATE PRODUCT IN THE PRESENCE OF PHOSGENE AT A HIGHER TEMPERATURE TO PRODUCE THE AROMATIC ISOCYANATE.
Claim 2
Dependent Claim
114 words
IN A METHOD OF PREPARING AROMATIC ISOCYANATES BY REACTING, IN AN INERT ORGANIC SOLVENT, A STOICHIOMETRIC EXCESS OF PHOSGENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF AROMATIC PRIMARY MONO-, DI-, AND POLYAMINES HAVING NO SUBSTITUENTS OTHER THAN PRIMARY AMINO WHICH ARE CAPABLE OF REACTING WITH PHOSGENE UNDER THE CONDITIONS EMPLOYED, TO FORM THE CORRESPONDING ISOCYANATE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE INITIAL PHOSGENATION AT A TEMPERATURE WITHIN THE RANGE OF 60*C. TO 90*C. TO PRODUCE AN INTERMEDIATE PRODUCT, WHICH CONTAINS AN ADMIXTURE OF THE DESIRED ISOCYANATE AND THE CORRESPONDING INTERMEDIATE CARBAMYL CHLORIDE, AND REACTING SAID INTERMEDIATE PRODUCT IN THE PRESENCE OF PHOSGENE AT A HIGHER TEMPERATURE TO PRODUCE THE AROMATIC ISOCYANATE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |