US3928355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymeric-alkylphenolsulfonamides
Assignee: Ethyl Corp
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Filing: 1972-10-26
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Granted: 1975-12-23
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Expires: 1992-10-26
Abstract
Abstract Novel sulfonamides soluble in C6 and higher alkanes and lubricating oils, which are antioxidants therefor preventing oxidative thickening of the oil, are obtained from nuclear carbon-to-carbon dimers to heptemers of 85 to 3,000 MW alkylsubstituted phenol converted to sulfonylchloride by known means and reacted with an amine, preferably an amine having at least two primary amino radicals. Sulfonamides of the monomeric alkylphenols while imparting detergency and dispersancy to lubricating oils prevent oxidative thickening of the oil.
Inventors
- 👤 Richard J Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
C; C07; C07D; C07D295/00; C07D295/04; C07D295/12; C07D295/125; C07D295/13; C08; C08F; C08F8/00; C08F8/30; C08F8/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
7 words
A SULFONAMIDE HAVING THE SUBSTITUTED SULFONYL RADICAL
Claim 2
Dependent Claim
7 words
A SULFONAMIDE HAVING THE SUBSTITUTED SULFONYL RADICAL
Claim 3
Dependent Claim
27 words
The linear polymeric sulfonamide of claim 1 wherein Y is the sulfonyl radical and there are repeating units of said disulfonyl-substituted compound and units of said amine.
Claim 4
Dependent Claim
23 words
The disulfonamide of claim 1 wherein Y is the sulfonyl radical and each sulfonyl radical is attached to a nitrogen of said amine.
Claim 5
Dependent Claim
26 words
The bis-sulfonamide of claim 1 wherein Y is hydrogen and two molecules of said substituted sulfonyl radical are attached to different nitrogen atoms of said piperazine.
Claim 6
Dependent Claim
21 words
The bis-sulfonamide of claim 4 wherein x is 2, R is 753 Mn polypropyl and said di(aminoalkyl) piperazine is di(aminopropyl) piperazine.
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) | 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 |