US4501678A
Expired / Lapsed
US
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Lubricants for improving fatigue life
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1983-06-02
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Granted: 1985-02-26
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Expires: 2003-06-02
Abstract
Abstract A lubricant for improving fatigue life is described, which comprises: (1) a lubricating base material, and (2) a compound having alkylthiocarbamoyl groups represented by the general formula (i): <IMAGE> (i) or (1) a lubricating base material, (2) a compound having alkylthiocarbamoyl groups represented by the general formula (i), (3) a molybdenum compound represented by the general formula (ii): <IMAGE> (ii) or by the general formula (iii): <IMAGE> (iii) and/or an ester compound. All the symbols in the formulae are as defined in the appended claims. This lubricant greatly prolongs the fatigue life of gears, etc.
Inventors
- 👤 Takao Katayama
- 👤 Masahiko Takesue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:20
CPC Classifications
C; C10; C10M; C10M135/00; C10M135/12; C10M135/14; C10M135/18; C10M129/00; C10M129/02; C10M129/68; C10M129/70; C10M129/72; C10M137/00; C10M137/02; C10M137/04; C10M137/06; C10M137/08; C10M141/00; C10M141/10; C10M2207/00; C10M2207/28; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/284; C10M2207/285; C10M2207/286; C10M2207/34; C10M2219/00; C10M2219/06; C10M2219/062; C10M2219/066; C10M2219/068; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/041; C10M2223/042; C10M2223/043; C10N; C10N2010/00; C10N2010/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
89 words
A lubricant for improving fatigue life which comprises: (1) a lubricating base material; and (2) a compound having alkylthiocarbamoyl groups represented by the formula (i): ##STR54## wherein R 1 , R 2 , R 3 , and R 4 are each an alkyl group containing from 1 to 20 carbon atoms, R 1 and R 2 , or R 3 and R 4 may be bound to each other to form a ring, and (A) is selected from the group consisting of S, S--S, S--S--S, S--S--S--S, S--S--S--S--S, and S--S--S--S--S--S.
Claim 2
Dependent Claim
89 words
A lubricant for improving fatigue life which comprises: (1) a lubricating base material; and (2) a compound having alkylthiocarbamoyl groups represented by the formula (i): ##STR54## wherein R 1 , R 2 , R 3 , and R 4 are each an alkyl group containing from 1 to 20 carbon atoms, R 1 and R 2 , or R 3 and R 4 may be bound to each other to form a ring, and (A) is selected from the group consisting of S, S--S, S--S--S, S--S--S--S, S--S--S--S--S, and S--S--S--S--S--S.
Claim 3
Dependent Claim
30 words
The lubricant as claimed in claim 1, wherein the proportion of the compound having alkylthiocarbamoyl groups is from 0.01 to 10% by weight of the total weight of the lubricant.
Claim 4
Dependent Claim
214 words
A lubricant for improving fatigue life which comprises: (1) a lubricating base material; (2) a compound having alkylthiocarbamoyl groups represented by formula (i): ##STR55## wherein R 1 , R 2 , R 3 , and R 4 are each an alkyl group containing from 1 to 20 carbon atoms, R 1 and R 2 , or R 3 and R 4 may be bound to each other to form a ring, and (A) is S, S--S, S--S--S, S--S--S--S, S--S--S--S--S, S--S--S--S--S--S, S--CH 2 --S, S--CH 2 CH 2 --S, or S--CH 2 CH 2 CH 2 --S; and at least one compound selected from (3) a molybdenum compound represented by formula (ii) or (iii): ##STR56## wherein R 5 and R 6 each contain from 1 to 30 carbon atoms and are each selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, and an alkylaryl group, and m is a real number meeting the requirement of 0≦m≦4; ##STR57## wherein R 7 and R 8 each contain from 1 to 30 carbon atoms and are each selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, and an alkylaryl group, and n is a real number meeting the requirement of 0≦n≦4; and (4) an ester compound.
Claim 5
Dependent Claim
214 words
A lubricant for improving fatigue life which comprises: (1) a lubricating base material; (2) a compound having alkylthiocarbamoyl groups represented by formula (i): ##STR55## wherein R 1 , R 2 , R 3 , and R 4 are each an alkyl group containing from 1 to 20 carbon atoms, R 1 and R 2 , or R 3 and R 4 may be bound to each other to form a ring, and (A) is S, S--S, S--S--S, S--S--S--S, S--S--S--S--S, S--S--S--S--S--S, S--CH 2 --S, S--CH 2 CH 2 --S, or S--CH 2 CH 2 CH 2 --S; and at least one compound selected from (3) a molybdenum compound represented by formula (ii) or (iii): ##STR56## wherein R 5 and R 6 each contain from 1 to 30 carbon atoms and are each selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, and an alkylaryl group, and m is a real number meeting the requirement of 0≦m≦4; ##STR57## wherein R 7 and R 8 each contain from 1 to 30 carbon atoms and are each selected from the group consisting of an alkyl group, a cycloalkyl group, an aryl group, and an alkylaryl group, and n is a real number meeting the requirement of 0≦n≦4; and (4) an ester compound.
Claim 6
Dependent Claim
30 words
The lubricant as claimed in claim 3, wherein the proportion of the compound having alkylthiocarbamoyl groups is from 0.01 to 10% by weight of the total weight of the lubricant.
Claim 7
Dependent Claim
28 words
The lubricant as claimed in claim 3, wherein the proportion of the molybdenum compound is from 0.01 to 20% by weight of the total weight of the lubricant.
Claim 8
Dependent Claim
28 words
The lubricant as claimed in claim 3, wherein the proportion of the ester compound is from 0.05 to 50% by weight of the total weight of the lubricant.
Claim 9
Dependent Claim
39 words
The lubricant as claimed in claim 3, wherein the ester compound is selected from the group consisting of phosphoric acid esters and amine salts thereof, esters of higher aliphatic acids, esters of higher aliphatic alcohols and dibasic acid esters.
Claim 10
Dependent Claim
30 words
The lubricant as claimed in claim 5, wherein the proportion of the compound having alkylthiocarbamoyl groups is from 0.01 to 10% by weight of the total weight of the lubricant.
Claim 11
Dependent Claim
28 words
The lubricant as claimed in claim 4, wherein the proportion of the ester compound is from 0.05 to 50% by weight of the total weight of the lubricant.
Claim 12
Dependent Claim
28 words
The lubricant as claimed in claim 5, wherein the proportion of the ester compound is from 0.05 to 50% by weight of the total weight of the lubricant.
Claim 13
Dependent Claim
35 words
A method of inhibiting metal fatigue in machines containing moving parts composed of said metal, said method comprising treating said moving parts with a metal fatigue inhibiting effective amount of the lubricant of claim 1.
Claim 14
Dependent Claim
30 words
The method as claimed in claim 11, wherein the proportion of the compound having alkylthiocarbamoyl groups is from 0.01 to 10% by weight of the total weight of the lubricant.
Claim 15
Dependent Claim
35 words
A method of inhibiting metal fatigue in machines containing moving parts composed of said metal, said method comprising treating said moving parts with a metal fatigue inhibiting effective amount of the lubricant of claim 3.
Claim 16
Dependent Claim
30 words
The method as claimed in claim 13, wherein the proportion of the compound having alkylthiocarbamoyl groups is from 0.01 to 10% by weight of the total weight of the lubricant.
Claim 17
Dependent Claim
28 words
The method as claimed in claim 13, wherein the proportion of the molybdenum compound is from 0.01 to 20% by weight of the total weight of the lubricant.
Claim 18
Dependent Claim
28 words
The method as claimed in claim 13, wherein the proportion of the ester compound is from 0.05 to 50% by weight of the total weight of the lubricant.
Claim 19
Dependent Claim
34 words
The method as claimed in claim 13, wherein the ester compound is selected from the group consisting of phosphoric acid esters and amine salts thereof, esters of higher aliphatic alcohols and dibasic acid esters.
Claim 20
Dependent Claim
30 words
The method as claimed in claim 15, wherein the proportion of the compound having alkylthiocarbamoyl groups is from 0.01 to 10% by weight of the total weight of the lubricant.
Claim 21
Dependent Claim
28 words
The method as claimed in claim 14, wherein the proportion of the ester compound is from 0.05 to 50% by weight of the total weight of the lubricant.
Claim 22
Dependent Claim
28 words
The method as claimed in claim 15, wherein the proportion of the ester compound is from 0.05 to 50% by weight of the total weight of the lubricant.
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) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |