US3896146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
3,5-dialkyl-4-hydroxyphenylalkyl substituted tricyclic imides
Assignee: Novartis Corp
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Filing: 1973-12-28
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Granted: 1975-07-22
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Expires: 1993-12-28
Abstract
Abstract Compounds having the formula WHEREIN R1 and R2 are lower alkyl, N IS 1 AND 2, M IS 0 TO 3, X IS 1 TO 6 AND Y IS 1 OR 2, ARE GOOD ANTIOXIDANTS OF SYNTHETIC POLYMERS. These compounds are prepared by reacting the appropriate exo-5-( omega hydroxyalkylthio)-norbornane-endo-2,3-dicarboximide with the appropriate methyl 3,5-dialkyl-4-hydroxyphenylalkanoate.
Inventors
- 👤 John F Stephen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:58
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/56; C07D209/58; C07D209/72; C07D209/76; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/378; C09; C09K; C09K15/00; C09K15/04; C09K15/28; C09K15/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND HAVING THE FORMULA
Claim 3
Dependent Claim
15 words
A compound of claim 1 wherein R1 and R2 are methyl, isopropyl or tert-butyl groups.
Claim 4
Dependent Claim
23 words
A compound of claim 2 wherein m is 0 or 1, n is 1, x is 2 and y is 1 or 2.
Claim 5
Dependent Claim
9 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxybenzyl)-exo-5-(2-(3-(3,5-di-tert-butyl-4 -hydroxyphenyl)-propionyloxy)-ethylthio)-norbornane-endo-2,3-dicarboximide.
Claim 6
Dependent Claim
9 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxybenzyl)-exo-5-(2-(3,5-di-tert-butyl-4 -hydroxyphenactoxy)-ethylthio)-norbornane-endo-2,3-dicarboximide.
Claim 7
Dependent Claim
9 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxyphenyl)-exo-5-(2-(3-(3,5-di-tert-butyl-4 -hydroxyphenyl)-propionyloxy)-ethylthio)-norbornane-endo-2,3-dicarboximide.
Claim 8
Dependent Claim
9 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxyphenyl)-exo-5-(2-(3,5-di-tert-butyl-4 -hydroxyphenylacetoxy)-ethylthio)-norbornane-endo-2,3-dicarboximide.
References Cited (Backward Citations)
US3234233A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |