Patent US4259254A successfully refreshed from Google Patents.
US4259254A
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Method of preparing lubricant additives
Assignee: QED Intellectual Property Ltd
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Filing: 1979-04-30
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Granted: 1981-03-31
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Expires: 1999-04-30
Abstract
Abstract The invention provides a molybdate compound that is useful in lubricants, especially hydrocarbyl lubricating oils, to reduce friction and to decrease fuel consumption in internal combustion engines.
Inventors
- 👤 Robert F. Bridger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:59
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/12; C10M135/14; C07; C07C; C07C329/00; C10M2205/00; C10M2205/02; C10M2205/028; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/109; C10M2219/00; C10M2219/06; C10M2219/062; C10N; C10N2010/00; C10N2010/12; C10N2040/00; C10N2040/25; C10N2040/251; C10N2040/255; C10N2040/28; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
77 words
A process for preparing a compound suitable for use in synthetic hydrocarbon oils of lubricating viscosity of the formula: ##STR4## comprising the step of reacting a metal molybdate or an ammonium molybdate with a hydrocarbyl dithiocarbonate acid in a mole ratio of molybdates to dithiocarbonate acid of from about 1:1 to 4:1 at a temperature of from 5° to about 60° C. and a pressure of from ambient to 50 psi for about 0.5 to 5 hours.
Claim 2
Dependent Claim
77 words
A process for preparing a compound suitable for use in synthetic hydrocarbon oils of lubricating viscosity of the formula: ##STR4## comprising the step of reacting a metal molybdate or an ammonium molybdate with a hydrocarbyl dithiocarbonate acid in a mole ratio of molybdates to dithiocarbonate acid of from about 1:1 to 4:1 at a temperature of from 5° to about 60° C. and a pressure of from ambient to 50 psi for about 0.5 to 5 hours.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein the hydrocarbyl group is an alkyl, a cycloalkyl, an aryl or an alkaryl group.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the temperature is from about 5° to about 35° C.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein in said composition R is 2-ethylhexyl.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein in said composition R is butyl.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein in said composition R is n-butyl.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein in said composition R is pentyl.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein in said composition R is heptyl.
References Cited (Backward Citations)
US2500195A
Cited
US2665291A
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Cited
GB789383A
Cited
GB796630A
Cited
US3400140A
Cited
US4098705A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |