US3795642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tris(hydroxyalkyl)-3,3,3-nitrilotripropionates
Assignee: Dow Chemical Co
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Filing: 1972-10-24
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Granted: 1974-03-05
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Expires: 1992-10-24
Abstract
Abstract COMPOUNDS HAVING THE STRUCTURE R-OOC-(CH2)2-N(-(CH2)2-COO-R'')-(CH2)2-COO-R" WHERE R, R'' AND R" ARE MONOHYDROXYALKYL GROUPS OF TWO TO FOUR CARBON ATOMS, ARE PREPARED BY REACTING THE CORRESPONDING MONOHYDROXYALKYL ACRYLATES WITH AMMONIA, THE COMPOUNDS MAY BE USED AS CROSS-LINKING AGENTS IN POLYURETHANES AND POLYESTER AND FOR THE REMOVAL OF ACID GASES FROM GAS STREAMS.
Inventors
- 👤 B Tefertiller
- 👤 J Nevill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:37
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; B01D53/34; B01D53/46; B01D53/68; B01J; B01J20/00; B01J20/22; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/38; C08G18/3819
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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |