US3657192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterically hindered secondary diamine curing agents for polyurethane compositions
Assignee: BASF Corp
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Filing: 1970-08-24
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Granted: 1972-04-18
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Expires: 1990-08-24
Abstract
Abstract STERICALLY HINDERED HETEROCYCLIC SECONDARY DIAMINES PREPARED BY THE REACTION OF MESITYL OXIDE WITH A VINCIAL DIAMINE AND CORRESPONDING TO THE FORMULA: R<(-NH-C(-CH3)2-CH=C(-CH3)-NH-) WHEREIN R IS THE ALKYLENE, CYCLOALKYENE OR ARYLE, ORGANIC RESIDUE OF THE VICINAL DIAMINE ARE USED AS CHAIN EXTENDER FOR URETHANE UREA POLYMOERS TO PROVIDE PRODUCTS WITH IMPROVED PROPERTIES AND POT LIFE.
Inventors
- 👤 Walter F Schulz
- 👤 Herwart C Vogt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:38
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10
Claims Analysis
Total Claims: 0
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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) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |