Patent US3392183A successfully refreshed from Google Patents.
US3392183A
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Preparation of biuret polyisocyanates
Assignee: Bayer AG
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Filing: 1964-01-29
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Granted: 1968-07-09
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Expires: 1984-01-29
Abstract
No abstract record available.
Inventors
- 👤 Windemuth Erwin
- 👤 Bayer Otto
- 👤 Wagner Kuno
- 👤 Bunge Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:22
CPC Classifications
C; C07; C07C; C07C273/00; C07C273/18; C07C273/1854; C07C273/1863; C07C273/1872; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/285; C08G18/2865; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7806; C08G18/7818; C08G18/7831
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A PROCESS FOR THE PREPARATION OF A BIURET POLYISOCYANATE WHICH COMPRISES REACTING A MONOMERIC PRIMARY MONOAMINE HAVING FROM 1 TO 6 CARBON ATOMS WITH A MONOMERIC ORGANIC DIISOCYANATE IN SUCH PROPORTIONS THAT THE RATIO OF -NCO TO -NH2 IS AT LEAST ABOUT 6 WHILE HEATING THE REACTION MIXTURE TO AN ELEVATED TEMPERATURE ABOVE ABOUT 150*C. AND ABOVE THE BOILING POINT OF THE RESULTING MONOISOCYANATE CONTAINING FROM 1 TO 6 CARBON ATOMS EXCLUSIVE OF THE -NCO GROUP WHILE CONTINUOUSLY REMOVING SAID MONOISOCYANATE FROM THE REACTION MIXTURE SUBSTANTIALLY AS SOON AS IT IS FORMED.
Claim 2
Dependent Claim
92 words
A PROCESS FOR THE PREPARATION OF A BIURET POLYISOCYANATE WHICH COMPRISES REACTING A MONOMERIC PRIMARY MONOAMINE HAVING FROM 1 TO 6 CARBON ATOMS WITH A MONOMERIC ORGANIC DIISOCYANATE IN SUCH PROPORTIONS THAT THE RATIO OF -NCO TO -NH2 IS AT LEAST ABOUT 6 WHILE HEATING THE REACTION MIXTURE TO AN ELEVATED TEMPERATURE ABOVE ABOUT 150*C. AND ABOVE THE BOILING POINT OF THE RESULTING MONOISOCYANATE CONTAINING FROM 1 TO 6 CARBON ATOMS EXCLUSIVE OF THE -NCO GROUP WHILE CONTINUOUSLY REMOVING SAID MONOISOCYANATE FROM THE REACTION MIXTURE SUBSTANTIALLY AS SOON AS IT IS FORMED.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |