US2855421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanates and method of preparing polyisocyanates
Assignee: Bayer AG
•
Filing: 1953-06-24
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Granted: 1958-10-07
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Expires: 1973-06-24
Abstract
No abstract record available.
Inventors
- 👤 Bunge Wilhelm
- 👤 Bayer Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:54
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/80; C08G18/8003; C08G18/8006; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3206; C08G18/3271; C08G18/3275; C08G18/73; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621; C08G18/8061; C08G18/8064; C08G18/8067; C09; C09D; C09D175/00; C09D175/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
AN IMPROVED PROCESS OF PRODUCING A POLYISOCYANATE WHICH COMPRISES REACTING (1) A MIXTURE OF A TRIHYDRIC ALCOHOL AND A DIHYDRIC ALCOHOL, THESE MEMBERS BEING SELECTED FROM THE GROUP CONSISTING OF A LOWER ALIPATIC DIHYDRIC ALCOHOL, A LOWER ALIPHATIC TRIHYDRIC ALCOHOL, TRIETHANOLAMINE, AND DIETHYLENE GLYCOL, WITH (2) AN ORGANIC DIISOCYANATE IN QUANTITIES SUCH THAT MORE THAN 1 AND NOT MORE THAN 1.7 ISOCYANATE GROUPS ARE PRESENT PER HYDROXYL GROUP, THE FIISOCYANATE BEING SELECTED FROM THE GROUP CONSISTING OF ALKYL, CYCLOALKYL, ARYL, AND ALKARYL DIISOCYANATES.
Claim 2
Dependent Claim
83 words
AN IMPROVED PROCESS OF PRODUCING A POLYISOCYANATE WHICH COMPRISES REACTING (1) A MIXTURE OF A TRIHYDRIC ALCOHOL AND A DIHYDRIC ALCOHOL, THESE MEMBERS BEING SELECTED FROM THE GROUP CONSISTING OF A LOWER ALIPATIC DIHYDRIC ALCOHOL, A LOWER ALIPHATIC TRIHYDRIC ALCOHOL, TRIETHANOLAMINE, AND DIETHYLENE GLYCOL, WITH (2) AN ORGANIC DIISOCYANATE IN QUANTITIES SUCH THAT MORE THAN 1 AND NOT MORE THAN 1.7 ISOCYANATE GROUPS ARE PRESENT PER HYDROXYL GROUP, THE FIISOCYANATE BEING SELECTED FROM THE GROUP CONSISTING OF ALKYL, CYCLOALKYL, ARYL, AND ALKARYL DIISOCYANATES.
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |