US2999873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of organic isocyanates
Assignee: GAF Chemicals Corp
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Filing: 1956-07-09
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Granted: 1961-09-12
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Expires: 1976-07-09
Abstract
No abstract record available.
Inventors
- 👤 Bloom Albert
- 👤 Harlan B Freyermuth
- 👤 James B Normington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:40
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10; C07C263/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE PROCESS OF PREPARING AROMATIC ISOCYANATES WHICH COMPRISES REACTING A SOLUTION OF PHOSGENE IN AN INERT SOLVENT WITH A SOLUTION OF AN AROMATIC AMINO COMPOUND SELECTED FROM THE CLASS CONSISTING OF ORGANIC MONOAND POLY-AMINES IN THE SAME INERT SOLVENT AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF 100*-200*C. WHILE PASSING PHOSGENE THROUGH THE SOLUTION MIXTURE, REMOVING THE HYDROGEN HALIDES FROM THE REACTION MIXTURE AND RECOVERING THE ISOCYANATE, THE SAID INERT SOLVENT COMPRISING FROM 50 TO 95% BY WEIGHT OF AN AROMATIC PETROLEUM SOLVENT DISTILLING AT APPROXIMATELY 125*-225*C. AND FROM 5-50% BY WEIGHT OF AN OXYGEN BEARING ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIALKYL ETHERS OF MONO-, DI- AND TRI-ALKYLENE GLYCOLS.
Claim 2
Dependent Claim
112 words
THE PROCESS OF PREPARING AROMATIC ISOCYANATES WHICH COMPRISES REACTING A SOLUTION OF PHOSGENE IN AN INERT SOLVENT WITH A SOLUTION OF AN AROMATIC AMINO COMPOUND SELECTED FROM THE CLASS CONSISTING OF ORGANIC MONOAND POLY-AMINES IN THE SAME INERT SOLVENT AT ATMOSPHERIC PRESSURE AND AT A TEMPERATURE OF 100*-200*C. WHILE PASSING PHOSGENE THROUGH THE SOLUTION MIXTURE, REMOVING THE HYDROGEN HALIDES FROM THE REACTION MIXTURE AND RECOVERING THE ISOCYANATE, THE SAID INERT SOLVENT COMPRISING FROM 50 TO 95% BY WEIGHT OF AN AROMATIC PETROLEUM SOLVENT DISTILLING AT APPROXIMATELY 125*-225*C. AND FROM 5-50% BY WEIGHT OF AN OXYGEN BEARING ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIALKYL ETHERS OF MONO-, DI- AND TRI-ALKYLENE GLYCOLS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-09-11 | 1965-03-13 | 1965-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-11 | 1969-03-13 | 1969-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-11 | 1973-03-13 | 1973-09-12 | $7700.00 | Window Closed / Lapsed |