US4801749A
Expired / Lapsed
US
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Phenolic antioxidant hydrazides
Assignee: Arkema Inc
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Filing: 1987-08-12
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Granted: 1989-01-31
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Expires: 2007-08-12
Abstract
Abstract Phenolic antioxidant hydrazides are provided which are useful to stabilize organic materials (such as synthetic polymers) which are subject to oxidative degradation.
Inventors
- 👤 Robert T. Kazmierczak
- 👤 Ronald E. MacLeay
- 👤 Jerome Wicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:52
CPC Classifications
C; C07; C07C; C07C243/00; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/24; C08K5/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A compound having the formula ##STR5## wherein R 1 is a tertiary alkyl of 4 to 8 carbons, R 2 is selected from hydrogen, t-alkyl of 4 to 8 carbons, and alkyl of 1 to 8 carbons, R 3 , R 4 , R 5 , R 6 , and R 7 are independently selected from hydrogen, alkyl of 1 to 6 carbons, and phenyl, y is an integer of from 0 to 6, and z in an integer of from 0 to 10.
Claim 2
Dependent Claim
84 words
A compound having the formula ##STR5## wherein R 1 is a tertiary alkyl of 4 to 8 carbons, R 2 is selected from hydrogen, t-alkyl of 4 to 8 carbons, and alkyl of 1 to 8 carbons, R 3 , R 4 , R 5 , R 6 , and R 7 are independently selected from hydrogen, alkyl of 1 to 6 carbons, and phenyl, y is an integer of from 0 to 6, and z in an integer of from 0 to 10.
Claim 3
Dependent Claim
78 words
The compound of claim 1 wherein R 1 is t-alkyl of 4 to 5 carbons, R 2 is selected from t-alkyl of 4 to 6 carbons and alkyl of 1 to 5 carbons, R 3 , R 4 , R 5 , R 6 , and R 7 are independently selected from alkyl of 1 to 5 carbons and hydrogen, y is an integer of from 0 to 4, and z is an integer from 0 to 6.
Claim 4
Dependent Claim
48 words
The compound of claim 2 wherein R 1 and R 2 are t-butyl, R 3 , R 4 , R 5 , R 6 and R 7 are hydrogen, y is an integer of from 0 to 3 and z is an integer of from 0 to 2.
Claim 5
Dependent Claim
8 words
The compound of claim 3 is 2-(3,5-di-t-butyl-4-hydroxyphenylamino)-2-oxoacetyl hydrazide.
Claim 6
Dependent Claim
8 words
A compound of claim 3 is 2-(3(3,5-di-t-butyl-4-hydroxyphenyl)propyl-amino)-2-oxoacetyl hydrazide.
Claim 7
Dependent Claim
8 words
A compound of claim 3 is 4-(3,5-di-t-butyl-4-hydroxyphenylamino)-4-oxobutanoyl hydrazide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |