A lubricating oil composition for an internal combustion engine contains: a base oil including a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm 2 /s or less, a CCS viscosity at âˆ’35 degrees C. of 3000 mPaÂ·s or less and a NOACK of 12 mass % or less and a component (B) of a mineral oil having a viscosity index of 120 or more; and polyisobutylene having a mass average molecular weight of 500,000 or more. A content of the composition (A) is 25 mass % or more of a total amount of a lubricating oil.

Claims

9 · 1 independent · depth 3

9 granted claims

›1.independentA lubricating oil composition for an internal combustion engine, comprising:na base oil comprising:na component (A) of a polyalphaolefin having a kine…+8

›2.↳ 1The lubricating oil composition according to claim 1, wherein a base oil provided by blending the components (A) and (B) has a kinematic viscosity at …d2

›3.↳ 1The lubricating oil composition according to claim 1, wherein the NOACK of the composition is 10 mass % or less, the CCS viscosity at âˆ’35 degrees C.…d2

›4.↳ 1The lubricating oil composition according to claim 1, wherein the component (B) is present in the composition in an amount of 20 mass % or more relati…d2

›5.↳ 1The lubricating oil composition according to claim 1, wherein the component (A) is a polyalphaolefin formed by polymerizing at least one alpha-olefin …d2

›6.↳ 1The lubricating oil composition according to claim 1, wherein the component (A) is a trimer.d2

›7.↳ 1A method for lubricating an internal combustion engine comprising contacting said engine with the lubricating oil composition for an internal combusti…d2+2

Classifications

10 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C10M171/00
C10M171/04
C10M171/02
C10M169/04

USPC · US Patent Classification

208/19585/13585/1585/10585/12208/18

Claim changes

Soon

Coming soonHow the claims changed between publication and grant

See which claims were amended, added or cancelled during examination, with every added and removed word marked.

AmendedAddedCancelledUnchanged

The published claims of this patent are not paired with the granted ones in what we hold.

File wrapper

⤢ drag to zoom

USPTOApplicanthover for detail · click to open

Pendency

4.0 y

1,461 days filing → grant

Office actions

non-final + final

Responses

no RCE

Interviews

examiner interview summaries

Examiner

Pamela H Weiss

art unit 1771 · TC 1700

Law firm

Law firm · Log in to unlock

Citations: 31 back · 0 forward

See the full prosecution history — every USPTO and applicant action on this file, in order.

Term & fees

See the term timeline — pendency span, in-force span, the maintenance fees paid and both computed expiry dates.

Priority chain

1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20130030226 A1	31 Jan 2013

Validity challenges

See the validity challenges on record — reexaminations, IPRs and PGRs, with their institution decisions and outcomes.

Citations

See every patent this one cites and every patent that cites it back — publication, assignee, and how each one was found.