US3759926A
Expired / Lapsed
US
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Piperidine derivatives as stabilizers
Assignee: Novartis Corp
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Filing: 1971-06-09
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Granted: 1973-09-18
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Expires: 1991-06-09
Abstract
Abstract New 4-Phosphinyl-4-hydroxypiperidines are useful as stabilizers for organic materials. They are prepared by reacting a 4-ketopiperidine with a phosphite.
Inventors
- 👤 A Chalmers
- 👤 C Hulme
- 👤 D Randell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:29
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/53; C08K5/5317; C08K5/5333; C08K5/5373; C07; C07F; C07F9/00; C07F9/02; C07F9/547; C07F9/553; C07F9/576; C07F9/58; C07F9/59; C08K5/5393
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
17 words
A piperidine derivative as claimed in claim 1 wherein R3 and R4 are each a methyl group.
Claim 2
Dependent Claim
45 words
A piperidine derivative As claimed in claim 1 wherein X is the radical O, H, OH, NO or methyl; R1 and R2 are each alkyl groups containing from 1 to 12 carbon atoms, cyclohexyl or benzyl and R3 and R4 are each a methyl group.
Claim 3
Dependent Claim
11 words
A compound a claimed in claim 1 which is 4-diethoxyphosphinyl-4-hydroxy-2,2,6,6-tetramethyl piperidine.
Claim 4
Dependent Claim
11 words
A compound as claimed in claim 1 which is 4-diethoxyphosphinyl-4-hydroxy-2,2,6,6-tetramethyl piperidine-1-oxyl.
Claim 5
Dependent Claim
11 words
A compound as claimed in claim 1 which is 4-dicyclohexoxyphosphinyl-4-hydroxy-2,2,6,6-tetramethyl piperidine.
Claim 6
Dependent Claim
11 words
A compound as claimed in claim 1 which is 4-di-n-butoxyphosphinyl-4-hydroxy-2,2,6,6-tetramethyl piperidine-1-oxyl.
Claim 7
Dependent Claim
11 words
A compound as claimed in claim 1 which is 4-diethoxyphosphinyl-1,4-dihydroxy-2,2,6,6-tetramethyl piperidine.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |