US3014942A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing isocyanates
Assignee: —
•
Filing: —
•
Granted: 1961-12-26
•
Expires: 1978-12-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:31
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10; C07C263/18; C07C263/20; C07C265/00; C07C265/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN THE METHOD FOR PRODUCING ISOCYANATES BY THE REACTION OF PHOSGENE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN AMINE AND AN AMINE SALT IN AN ALKYL PHTHALATE SOLVENT WHEREIN THE ALKYL RADICAL IS SELECTED FROM THE GROUP CONSISTING OF ETHYL, BUTYL, AND OCTYL RADICALS, THE IMPROVEMENT FOR PURIFYING SAID SOLVENT, COMPRISING DISTILLING OFF FROM SAID ALKYL PHTHALATE SOLVENT THE ISOCYANATES FORMED BY SAID REACTION, HEATING THE REMAINING SOLVENT TO A TEMPERATURE WITHIN THE RANGE OF 150-200*C. TO PRECIPITATE THE IMPURITIES CONTAINRD IN SAID SOLVENT, AND SEPARATING THE PRECIPITATED IMPURITIES FROM SAID SOLVENT.
Claim 2
Dependent Claim
95 words
IN THE METHOD FOR PRODUCING ISOCYANATES BY THE REACTION OF PHOSGENE WITH A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN AMINE AND AN AMINE SALT IN AN ALKYL PHTHALATE SOLVENT WHEREIN THE ALKYL RADICAL IS SELECTED FROM THE GROUP CONSISTING OF ETHYL, BUTYL, AND OCTYL RADICALS, THE IMPROVEMENT FOR PURIFYING SAID SOLVENT, COMPRISING DISTILLING OFF FROM SAID ALKYL PHTHALATE SOLVENT THE ISOCYANATES FORMED BY SAID REACTION, HEATING THE REMAINING SOLVENT TO A TEMPERATURE WITHIN THE RANGE OF 150-200*C. TO PRECIPITATE THE IMPURITIES CONTAINRD IN SAID SOLVENT, AND SEPARATING THE PRECIPITATED IMPURITIES FROM SAID SOLVENT.
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) | 1964-12-25 | 1965-06-26 | 1965-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-25 | 1969-06-26 | 1969-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-25 | 1973-06-26 | 1973-12-26 | $7700.00 | Window Closed / Lapsed |