US3734926A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzophenone-3,4,3{40 ,4-tetracarboxylic acid diimides of 3,5-dialkyl-4-hydroxyphenylsubstituted amines
Assignee: Novartis Corp
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Filing: 1971-10-04
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Granted: 1973-05-22
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Expires: 1991-10-04
Abstract
Abstract Benzophenonetetracarboxylic acid diimides of 3,5-dialkyl-4hydroxyphenylsubstituted amines of this invention effectively stabilize organic materials against the effects of heat and oxygen. The diimides of this invention are prepared by reacting the appropriate 3,5-dialkyl-4-hydroxyphenylsubstituted amine with benzophenone-3,4,3'',4''-tetracarboxylic acid dianhydride or diimide. An example of this class of stabilizers is N,N''-bis(3,5di-t-butyl-4-hydroxybenzyl)3,4,3'',4''-tetracarboxylic aciddiimide.
Inventors
- 👤 M Dexter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:32
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/44; C07D209/48; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415; C08K5/3417; C09; C09K; C09K15/00; C09K15/04; C09K15/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
The compound according to claim 1 wherein R1 and R2 is tertiary butyl or methyl.
Claim 2
Dependent Claim
12 words
The compound according to claim 2 which is N,N''-bis-3,5-di-t-butyl-4-hydroxybenzyl)benzophenone-3,4,3'',4'' -tetracarboxylic acid diimide.
References Cited (Backward Citations)
US3275651A
Cited
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 |