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US5482638A
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Metal-free dithiophosphoric acid derivatives
Assignee: Rhein Chemie Rheinau GmbH
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Filing: 1993-12-06
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Granted: 1996-01-09
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Expires: 2013-12-06
Abstract
Abstract Addition products of monoepoxides or diepoxides of mono- or polyunsaturated monocyclic or bicyclic hydrocarbons and dithiophosphoric acids, a process for the production of the adducts from the corresponding dithiophosphoric acids and epoxides and the use of the addition products as lubricant additives in lubricants based on mineral oils or native oils.
Inventors
- 👤 Thomas Dimmig
- 👤 Gunter Jager
- 👤 Thomas Petri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
C; C10; C10M; C10M137/00; C10M137/02; C10M137/04; C10M137/10; C10M137/105; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C07F9/177; C10M101/00; C10M101/02; C10M101/04; C10M129/00; C10M129/02; C10M129/16; C10M129/18; C10M159/00; C10M159/12; C10M159/123; C10M169/00; C10M169/04; C10M2203/00; C10M2203/10; C10M2203/1006; C10M2203/102; C10M2203/1025; C10M2203/104; C10M2203/1045; C10M2203/106; C10M2203/1065; C10M2203/108; C10M2203/1085; C10M2207/00; C10M2207/04; C10M2207/042; C10M2207/40; C10M2207/401; C10M2207/404; C10M2207/4045; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2223/047; C10M2223/12; C10M2223/121
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
18 words
Metal-free dithiophosphoric acid derivatives, obtained by reaction of dialkyl, diaryl or mixed alkyl/aryl dithiophosphoric acids with dicyclopentadiene diepoxide.
Claim 2
Dependent Claim
18 words
Metal-free dithiophosphoric acid derivatives, obtained by reaction of dialkyl, diaryl or mixed alkyl/aryl dithiophosphoric acids with dicyclopentadiene diepoxide.
Claim 3
Dependent Claim
16 words
The metal-free dithiophosphoric acid derivatives of claim 1, wherein the dithlophosphoric acid is 2-ethylhexyl dithiophosphoric acid.
Claim 4
Dependent Claim
29 words
The metal-free dithiophosphosphoric acid derivatives of claim 1, wherein the dithiophosphoric acid is selected from the group consisting of 0,0'-dialkyl dithiophosphoric acid, 0,0'-diaryl dithiophosphoric acid or 0,0'-alkyl/aryl dithiophosphoric acid.
Claim 5
Dependent Claim
43 words
A method of improving the anti-wear properties and the resistance to ageing of a lubricant containing a basic oil using the metal-free dithiophosphoric acid derivatives of claim 1, wherein said metal-free dithiophosphoric acid derivatives are added to the basic oil of the lubricant.
Claim 6
Dependent Claim
16 words
The method of claim 4, wherein the basic oil of the lubricant is a mineral oil.
Claim 7
Dependent Claim
16 words
The method of claim 4, wherein the basic oil of the lubricant is a natural triglyceride.
Claim 8
Dependent Claim
16 words
The method of claim 4, wherein the basic oil of the lubricant is a natural oil.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |