Patent US3668125A successfully refreshed from Google Patents.
US3668125A
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Block copolymers as viscosity index improvers for lubricating oils
Assignee: Shell USA Inc
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Filing: 1969-12-12
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Granted: 1972-06-06
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Expires: 1989-12-12
Abstract
Abstract Certain hydrogenated or saturated block copolymers having at least three blocks are highly effective viscosity index improving additives for mineral oils and are especially effective at elevated temperatures.
Inventors
- 👤 William S Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:00
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C10M2205/00; C10M2205/04; C10M2205/06; C10M2207/00; C10M2207/04; C10M2207/046; C10M2207/28; C10M2207/282; C10M2207/34; C10M2215/00; C10M2215/086; C10M2215/24; C10M2215/28; C10M2217/00; C10M2217/02; C10M2217/028; C10M2217/04; C10M2217/06; C10M2219/00; C10M2219/04; C10M2219/044; C10M2219/046; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10M2229/00; C10M2229/02; C10M2229/04; C10M2229/05; C10N; C10N2040/00; C10N2040/02; C10N2040/08; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
13 words
A composition according to claim 1 where the oil is a lubricating oil.
Claim 2
Dependent Claim
31 words
A lubricating composition according to claim 1 comprising a mineral lubricating oil and 1.0-4.5 percent by weight of a three-block copolymer of a hydrogenated polystyrene block and a hydrogenated polyisoprene block.
Claim 3
Dependent Claim
32 words
A lubricating composition according to claim 1 comprising a mineral lubricating oil and 1.0-4.5 percent by weight of a block copolymer of alternating hydrogenated polystyrene blocks and hydrogenated conjugated diene polymer blocks.
Claim 4
Dependent Claim
31 words
A lubricating composition according to claim 1 having a viscosity no greater than about 2,600 cp at 0* F. and a viscosity of at least about 50 cp at 210* F.
Claim 5
Dependent Claim
17 words
A lubricating composition according to claim 1 containing in addition a stabilizing proportion of lubricating oil detergent.
References Cited (Backward Citations)
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US3060120A
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US3338877A
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GB1033456A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |