US3896147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hindered phenolic norbornane-2,3-dicarboximides
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, R3 is alkyl, another hindered phenolic norbornane-2,3dicarboximide group, or a group -(CH2)-CO2R4 and M IS 0 TO 3, N IS 1 OR 2 AND R4 is alkyl, ARE GOOD OXIDATIVE AND THERMAL STABILIZERS OF SYNTHETIC POLYMERS.
Inventors
- 👤 John F Stephen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:58
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/378; C07; C07D; C07D209/00; C07D209/56; C07D209/58; C07D209/72; C07D209/76
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
49 words
Compounds of claim 1 wherein R1 and R2 are methyl, isopropyl or tert-butyl, n is 1, R3 is alkyl from 4 to 18 carbons or a group of formulae II, III or IV where x is 2 to 6 and R4 is alkyl having from 4 to 18 carbons.
Claim 4
Dependent Claim
11 words
Compounds of claim 2 wherein R1 and R2 are tert-butyl groups.
Claim 5
Dependent Claim
9 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxyphenyl)-exo-5-n-octadecylthionorbornane-endo -2,3-dicarboximide.
Claim 6
Dependent Claim
8 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxyphenyl)-exo-5-n-dodecylthionorbornane-endo-2,3-dicarboximide.
Claim 7
Dependent Claim
8 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxyphenyl)-exo-5-(2-carbo-n-dodecyl-oxyethylthio)-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-hydroxybenzyl)-exo-5-n-octadecylthionorbornane-endo -2,3-dicarboximide.
Claim 9
Dependent Claim
9 words
The compound of claim 1 which is trimethylenedithio-bis (N-(3,5-di-tert-butyl-4-hydroxybenzyl)-5-norbornane-endo-2,3-dicarboximide).
Claim 10
Dependent Claim
9 words
The compound of claim 1 which is 5,5''-bis(N-(3,5-di-tert-butyl-4-hydroxybenzyl)-norbornane-endo-2,3 -dicarboximide)sulfide.
Claim 11
Dependent Claim
8 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxybenzyl)-exo-5-(2-carbo-n-dodecyloxymethylthio)-norbornane-endo-2,3-dicarboximide.
Claim 12
Dependent Claim
9 words
The compound of claim 1 which is N-(3,5-di-tert-butyl-4-hydroxybenzyl-exo-5-(2-carbo-n -octadecyloxymethylthio)-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 |