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US3290288A
Expired / Lapsed
US
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Process for the dimerization of aromatic isocyanates
Assignee: Bayer AG
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Filing: 1963-12-05
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Granted: 1966-12-06
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Expires: 1983-12-05
Abstract
No abstract record available.
Inventors
- 👤 Oertel Gunter
- 👤 Holtschmidt Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:49
CPC Classifications
C; C07; C07D; C07D229/00; Y; Y10; Y10S; Y10S534/00; Y10S534/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A PROCESS FOR THE DIMERIZATION OF AROMATIC ISOCYANATE HAVING AT LEAST ONE NCO GROUP BONDED TO AN AROMATIC RING WHICH HAS ONLY HYDROGEN ATOMS ON ORTHO CARBON ATOMS WHICH COMPRISES CONTACTING SAID AROMATIC ISOCYANATE WITH A CATALYTIC AMOUNT OF A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE DIMERIZATION OF AROMATIC ISOCYANATE HAVING AT LEAST ONE NCO GROUP BONDED TO AN AROMATIC RING WHICH HAS ONLY HYDROGEN ATOMS ON ORTHO CARBON ATOMS WHICH COMPRISES CONTACTING SAID AROMATIC ISOCYANATE WITH A CATALYTIC AMOUNT OF A COMPOUND HAVING THE FORMULA
References Cited (Backward Citations)
US2683144A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-05 | 1970-06-06 | 1970-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-05 | 1974-06-06 | 1974-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-05 | 1978-06-06 | 1978-12-06 | $7700.00 | Window Closed / Lapsed |