US2901497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of aromatic isocyanates
Assignee: Bayer Corp
•
Filing: 1954-04-09
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Granted: 1959-08-25
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Expires: 1974-04-09
Abstract
No abstract record available.
Inventors
- 👤 Delfs Detlef
- 👤 Munz Ferdinand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:05
CPC Classifications
C; C07; C07C; C07C263/00; C07C263/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN THE PROCESS FOR THE PRODUCTION OF DI- AND POLYISOCYANATES IN WHICH PHOSGENE IS REACTED WITH A HYDROCHLORIDE OF AND AROMATIC AMINE, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID REACTION WITH AN AMINE HYDROCHLORIDE FORMED BY MIXING AN AROMATIC AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AROMATIC DIAMINES AND PRIMARY AROMATIC POLYMINES WITH A SOLVENT HAVING THE GENERAL FORMULA
Claim 2
Dependent Claim
59 words
IN THE PROCESS FOR THE PRODUCTION OF DI- AND POLYISOCYANATES IN WHICH PHOSGENE IS REACTED WITH A HYDROCHLORIDE OF AND AROMATIC AMINE, THE IMPROVEMENT WHICH COMPRISES EFFECTING SAID REACTION WITH AN AMINE HYDROCHLORIDE FORMED BY MIXING AN AROMATIC AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY AROMATIC DIAMINES AND PRIMARY AROMATIC POLYMINES WITH A SOLVENT HAVING THE GENERAL FORMULA
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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |