Patent US3179290A successfully refreshed from Google Patents.
Patent US3734884A successfully refreshed from Google Patents.
US3734884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bisoxalic acid diamides as stabilizers
Assignee: Novartis AG
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Filing: 1972-06-15
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Granted: 1973-05-22
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Expires: 1992-06-15
Abstract
Abstract BISOXALIC ACID DIAMINES HAVING THE STRUCTURE ((4-HO,3,5-DI((CH3)3-C-)PHENYL)-NH-CO-CO-NH)2-R WHERE R IS AN ALKYLENE GROUP HAVING 5 TO 18 CARBON ATOMS ARE STABILIZERS OF ORGANIC MATERIALS SUCH AS POLYOLEFINS. THESE COMPOUNDS ARE PREPARED BY REACTING AN OXALIC ACID MONOAMIDE OR THE CHLORIDE OR AN ESTER THEREOF WITH AN ALKYLENE DIAMINE.
Inventors
- 👤 M Dunnenberger
- 👤 H Biland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:09
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/20
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |