US4072619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ester lubricants containing polyoxyalkylene phenothiazines
Assignee: Dow Chemical Co
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Filing: 1976-08-30
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Granted: 1978-02-07
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Expires: 1996-08-30
Abstract
Abstract Synthetic ester lubricant blends are described which contain 1-90 weight percent of an N-substituted polyoxyalkylene phenothiazine. The polyoxyalkylene group can be derived from ethylene, propylene, butylene or styrene oxides. The blends have superior oxidative and thermal stability and at the same time have good viscosity characteristics and pour points over a wide range of temperatures.
Inventors
- 👤 Dennis A. Williams
- 👤 Robert Carswell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:12
CPC Classifications
C; C10; C10M; C10M169/00; C10M169/04; C10M105/00; C10M105/08; C10M105/32; C10M105/72; C10M111/00; C10M111/02; C10M129/00; C10M129/02; C10M129/68; C10M135/00; C10M135/32; C10M135/36; C10M2203/00; C10M2203/003; C10M2207/00; C10M2207/28; C10M2207/2805; C10M2207/281; C10M2207/282; C10M2207/283; C10M2207/286; C10M2207/30; C10M2207/302; C10M2207/304; C10M2207/34; C10M2207/345; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/109; C10M2219/00; C10M2219/003; C10M2219/02; C10M2219/021; C10M2219/04; C10M2219/0406; C10M2219/046; C10M2219/0463; C10M2219/06; C10M2219/061; C10M2219/08; C10M2219/081; C10M2219/10; C10M2219/101; C10M2219/104; C10M2219/106; C10M2219/108; C10M2221/00; C10M2221/04; C10M2221/043
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
87 words
A lubricant composition comprising an organic ester based synthetic fluid and about 1 to about 90 weight percent of a phenothiazine having an N-substituted polyoxyalkylene group and having a weight average molecular weight range from about 300 to about 5000 wherein the polyoxyalkylene group is derived from an alkylene oxide selected from ethylene, propylene, butylene, styrene oxides or mixtures thereof with the proviso that less than about 85% by weight of said phenothiazine is derived from ethylene oxide when said polyoxyalkylene group is derived from ethylene oxide.
Claim 2
Dependent Claim
87 words
A lubricant composition comprising an organic ester based synthetic fluid and about 1 to about 90 weight percent of a phenothiazine having an N-substituted polyoxyalkylene group and having a weight average molecular weight range from about 300 to about 5000 wherein the polyoxyalkylene group is derived from an alkylene oxide selected from ethylene, propylene, butylene, styrene oxides or mixtures thereof with the proviso that less than about 85% by weight of said phenothiazine is derived from ethylene oxide when said polyoxyalkylene group is derived from ethylene oxide.
Claim 3
Dependent Claim
21 words
The composition of claim 1 wherein the amount of said substituted phenothiazine ranges from about 5 to about 50 weight percent.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein the molecular weight of said substituted phenothiazine ranges from about 375 to about 1300.
Claim 5
Dependent Claim
20 words
The composition of claim 2 wherein the molecular weight of said substituted phenothiazine ranges from about 375 to about 1300.
Claim 6
Dependent Claim
16 words
The composition of claim 1 wherein the organic ester comprises a monoester of a monocarboxylic acid.
Claim 7
Dependent Claim
20 words
The composition of claim 1 wherein the organic ester comprises a diester of a dicarboxylic acid and a monofunctional alcohol.
Claim 8
Dependent Claim
20 words
The composition of claim 1 wherein the organic ester comprises a triester of a trifunctional alcohol and a monocarboxylic acid.
Claim 9
Dependent Claim
20 words
The composition of claim 1 wherein the organic ester comprises a diester of a difunctional alcohol and a monocarboxylic acid.
Claim 10
Dependent Claim
20 words
The composition of claim 1 wherein the organic ester comprises a tetraester of a tetrafunctional alcohol and a monocarboxylic acid.
Claim 11
Dependent Claim
26 words
The composition of claim 2 wherein the substituted phenothiazine is N-polyoxypropylene-polyoxybutylene-phenothiazine of 1000-1200 molecular weight having a 9:1 weight ratio of oxypropylene groups to oxybutylene groups.
Claim 12
Dependent Claim
26 words
The composition of claim 2 wherein the substituted phenothiazine is N-polyoxypropylene-polyoxyethylene-phenothiazine of 1000-1200 molecular weight having a 1:1 weight ratio of oxypropylene groups to oxyethylene groups.
Claim 13
Dependent Claim
26 words
The composition of claim 2 wherein the substituted phenothiazine is N-polyoxyethylene-polyoxybutylene-phenothiazine of 1200-1400 molecular weight having a 1:1 weight ratio of oxyethylene groups to oxybutylene groups.
Claim 14
Dependent Claim
26 words
The composition of claim 2 wherein the substituted phenothiazine is N-polyoxypropylene-polyoxyethylene of 2900-3100 molecular weight having a 1.3:1 weight ratio of oxypropylene groups to oxyethylene groups.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |