US3736350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aromatic diamines containing ester groups
Assignee: Bayer AG
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Filing: 1969-10-14
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Granted: 1973-05-29
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Expires: 1989-10-14
Abstract
Abstract NOVEL AROMATIC DIAMINES CONTAINING ESTER GROUPS WHEREIN THE AMINO GROUPS ARE IN THE M AND/OR P-POSITION RELATIVE TO THE ESTER GROUP, AND WITH A SUBSTITUENT IN THE OPOSITION TO AT LEAST ONE AMINO GROUP ARE USEFUL TO PREPARE POLYURETHANE ELASTOMERS THEREFROM WITH AN ORGANIC DIISOCYANATE AND AN ORGANIC COMPOUND CONTAINING AT LEAST TWO HYDROXYL GROUP AND HAVING A MOLECULAR WEIGHT OF FROM ABOUT 800 TO ABOUT 5000.
Inventors
- 👤 W Meckel
- 👤 E Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6529; C08G18/08; C08G18/10; C08G18/30; C08G18/38; C08G18/3819; C08G18/3821
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |