Patent US2671082A successfully refreshed from Google Patents.
US2671082A
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Preparation of aromatic isocyanate dimers
Assignee: EIDP Inc
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Filing: 1951-09-25
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Granted: 1954-03-02
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Expires: 1971-09-25
Abstract
No abstract record available.
Inventors
- 👤 Stallmann Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:03
CPC Classifications
C; C07; C07D; C07D273/00; C07D229/00; Y; Y10; Y10S; Y10S8/00; Y10S8/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS OF PREPARING A COMPOUND CONTAINING AT LEAST ONE GROUPING WHICH IS AN ADDITION PRODUCT OF TWO ISOCYANATE RADICALS WHICH COMPRISES CONTACTING AN AROMATIC ISOCYANATE WITH FROM 0.1 TO 10% BY WEIGHT OF A MIXED AROMATICALIPHATIC TERTIARY PHOSPHINE CATALYST SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
46 words
A PROCESS OF PREPARING A COMPOUND CONTAINING AT LEAST ONE GROUPING WHICH IS AN ADDITION PRODUCT OF TWO ISOCYANATE RADICALS WHICH COMPRISES CONTACTING AN AROMATIC ISOCYANATE WITH FROM 0.1 TO 10% BY WEIGHT OF A MIXED AROMATICALIPHATIC TERTIARY PHOSPHINE CATALYST SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US2520601A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |