US2847440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of isocyanates
Assignee: GAF Chemicals Corp
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Filing: 1956-07-09
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Granted: 1958-08-12
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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
2026-10-31 12:55
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10; C07C263/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN THE PROCESS FOR THE PREPARATION OF ISOCYANATES WHEREIN A SLURRY, IN AN INERT ORGANIC SOLVENT HAVING A BOILING POINT BELOW THE BOILING POINT OF THE OSOCYANATE BEING PREPARED, OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC AMINE SALTS WITH A VOLATINE ACID, AND AN ORGANIC AMINE CARBAMYL CHLORIDE-HYDROCHLORIDE IS TREATED AT AN ELEVATED TEMPERATURE IN THE RANGE OF ABOUT 100 TO 200*C. WITH PHOSGENE, WHEREBY THE ISOCYANATE IS FORMED; THE IMPROVEMENT WHICH COMPRISES EMPLOYING, AS THE INERT ORGANIC SOLVENT IN SAID REACTION, AN ALKYL ARYL KETONE HAVING A BOILING POINT LOWER THAN THE BOILING POINT OF THE ISOCYANATE BEING PREPARED AND HAVING THE FORMULA
Claim 2
Dependent Claim
107 words
IN THE PROCESS FOR THE PREPARATION OF ISOCYANATES WHEREIN A SLURRY, IN AN INERT ORGANIC SOLVENT HAVING A BOILING POINT BELOW THE BOILING POINT OF THE OSOCYANATE BEING PREPARED, OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ORGANIC AMINE SALTS WITH A VOLATINE ACID, AND AN ORGANIC AMINE CARBAMYL CHLORIDE-HYDROCHLORIDE IS TREATED AT AN ELEVATED TEMPERATURE IN THE RANGE OF ABOUT 100 TO 200*C. WITH PHOSGENE, WHEREBY THE ISOCYANATE IS FORMED; THE IMPROVEMENT WHICH COMPRISES EMPLOYING, AS THE INERT ORGANIC SOLVENT IN SAID REACTION, AN ALKYL ARYL KETONE HAVING A BOILING POINT LOWER THAN THE BOILING POINT OF THE ISOCYANATE BEING PREPARED AND HAVING THE FORMULA
References Cited (Backward Citations)
US2680130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |