US3824266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanates which contain biuret groups
Assignee: Bayer AG
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Filing: 1973-02-05
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Granted: 1974-07-16
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Expires: 1993-02-05
Abstract
Abstract POLYISOCYANATES WHICH CONTAIN BIURET GROUPS ARE PREPARED BY A PROCESS WHICH COMPRISES REACTING A POLYISOCYANATE WITH A DIPRIMARY AROMATIC DIAMINE THE REACTIVITY OF WHICH AMINES WITH ISOCYANATES ARE ATTENUATED BY ELECTROPHLILIC SUBSTITUENTS OR SUBSTITUENTS WHICH STERICALLY HINDER THE AMINO GROUPS SUCH THAT INTIMATE MIXING OF THE REACTANTS IS POSSIBLE WITH NO IMMEDIATE REACTION SUCH AS, FOR EXAMPLE, THE FORMATION OF POLYUREAS TAKING PLACE.
Inventors
- 👤 W Dietrich
- 👤 H Kleimann
- 👤 C Koenig
- 👤 K Wagner
- 👤 K Richert
- 👤 W Meckel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:18
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C07; C07C; C07C273/00; C07C273/18; C07C273/1809; C07C273/1818; C07C273/1827; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831; C08J2375/00; C08J2375/04
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |