US3928330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted piperazinedione carboxylic acids and metal salts thereof
Assignee: Novartis Corp
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Filing: 1973-12-19
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Granted: 1975-12-23
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Expires: 1993-12-19
Abstract
Abstract Substituted piperazinedione carboxylic acids and metal salts thereof are stabilizers for synthetic polymeric materials normally subject to deterioration caused by ultraviolet light. The acids may be formed by reacting together the alkali or alkaline earth metal salts of a substituted piperazinedione and of a halo-alkanoic acid and then acidifying. The metal salts of the acids are readily prepared by reacting the acids or their salts with a reactive form of the metal or metal complex. Polymeric compositions containing these stabilizers may also contain a hindered phenolic compound. A typical embodiment is 6(15-(7,15-diazadispiro(5,1,5,3)hexadecane-14,16-dione))hexanoic acid.
Inventors
- 👤 Chester E Ramey
- 👤 John J Luzzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:29
CPC Classifications
C; C07; C07F; C07F15/00; C07F15/06; C07F15/065; C07D; C07D241/00; C07D241/02; C07D241/06; C07D241/08; C07F13/00; C07F13/005; C07F15/02; C07F15/025; C07F15/04; C07F15/045; C07F7/00; C07F7/22; C07F7/2224; C08; C08K; C08K5/00; C08K5/0091; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C09; C09K; C09K15/00; C09K15/04; C09K15/30
Claims Analysis
Total Claims: 13
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
A compound according to claim 1, wherein n is an integer of from 1 to 10; M is hydrogen or a metal selected from nickel and manganese; and m has a value of 1 or 2, the value of m being the same as the available valence of M.
Claim 4
Dependent Claim
18 words
A compound according to claim 2, wherein R1 and R2 are independently of each other methyl or ethyl.
Claim 5
Dependent Claim
12 words
A compound according to claim 2, wherein R1 and R2 are methyl.
Claim 6
Dependent Claim
23 words
A compound according to claim 2 wherein R1 and R2 together with the carbon to which they are bound form a cyclohexyl ring.
Claim 7
Dependent Claim
12 words
A compound according to claim 2, wherein M is hydrogen or nickel.
Claim 8
Dependent Claim
11 words
A compound according to claim 6, which is Alpha -(15-7,15-diazadispiro(5.1.5.3)hexadecane-14,16-dione)acetic acid.
Claim 9
Dependent Claim
11 words
A compound according to claim 6, which is Alpha -15-(7,15-diazadispiro(5.1.5.3)hexadecane-14,16-dione)acetic acid.
Claim 10
Dependent Claim
10 words
A compound according to claim 6, which is 6-(15-7,15-diazadispiro(5.1.5.3)hexadecane-14,16-dione)hexanoic acid.
Claim 11
Dependent Claim
10 words
A compound according to claim 6, which is 11-(15-7,15-diazadispiro(5.1.5.3)hexadecane-14,16-dione)undecanoic acid.
Claim 12
Dependent Claim
14 words
A compound according to claim 6, which is a nickel complex of 6-(15-7,15-diazadispiro(5.1.5.3)hexadecane-14,16-dione)hexanoic acid.
Claim 13
Dependent Claim
15 words
A compound according to claim 6, which is a nickel complex of 11-(15-7,15-diazadispiro (5.1.5.3)hexadecane-14,16-dione)hexanoic acid.
References Cited (Backward Citations)
US3728348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |