US3128310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of amines
Assignee: Bayer AG
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Filing: 1959-07-31
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Granted: 1964-04-07
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Expires: 1979-07-31
Abstract
No abstract record available.
Inventors
- 👤 Koch Hans-Joachim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:38
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/18; C07C263/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A PROCESS FOR THE PREPARATION OF AROMATIC CARBOCYCLIC PRIMARY AMINES SELECTED FROM THE GROUP CONSISTING OR AROMATIC CARBOCYCLIC PRIMARY MONOAMNES AND METAAND PARA-AROMATIC CARBOCYCLIC PRIMARY DIAMINES WHICH COMPRISES HEATING WATER AND THE DISTILLATION RESIDUE OBTAINED WHEN DISTILLING THE PRODUCT OF PHOSGENATION OF SAID AROMATIC PRIMARY AMINE TO FORM THE CORRESPONDING ISOCYANATE TO A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 160*C. TO ABOUT 250*C. UNTIL SAID DISTILLATION RESIDUE IS CONVERTED BY REACTION WITH SAID WATER TO SAID AROMATIC PRIMARY AMINE.
Claim 2
Dependent Claim
80 words
A PROCESS FOR THE PREPARATION OF AROMATIC CARBOCYCLIC PRIMARY AMINES SELECTED FROM THE GROUP CONSISTING OR AROMATIC CARBOCYCLIC PRIMARY MONOAMNES AND METAAND PARA-AROMATIC CARBOCYCLIC PRIMARY DIAMINES WHICH COMPRISES HEATING WATER AND THE DISTILLATION RESIDUE OBTAINED WHEN DISTILLING THE PRODUCT OF PHOSGENATION OF SAID AROMATIC PRIMARY AMINE TO FORM THE CORRESPONDING ISOCYANATE TO A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 160*C. TO ABOUT 250*C. UNTIL SAID DISTILLATION RESIDUE IS CONVERTED BY REACTION WITH SAID WATER TO SAID AROMATIC PRIMARY AMINE.
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) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |