The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2011
Filed:
Mar. 28, 2007
Miyuki Hashida, Ibaraki, JP;
Toshio Nitta, Ibaraki, JP;
Miyuki Hashida, Ibaraki, JP;
Toshio Nitta, Ibaraki, JP;
NOK Kluber Co., Ltd., Tokyo, JP;
Abstract
A lubricant composition for oil-impregnated sintered bearings, which comprises at least one base oil selected from a perfluoropolyether oil represented by the following general formula:RfO(CFCFO)(CFO)Rf(where Rf is a perfluoroalkyl group having 1-5 carbon atoms, m+n=3-200, m:n=10-90:90-10), a perfluoropolyether oil represented by the following general formula:RfO[CF(CF)CFO](CFCFO)(CFO)Rf(where Rf is a perfluoroalkyl group having 1-5 carbon atoms, p+q+r=3-200, q and r each may be 0, and (q+r)/p=0-2), and a polyfluoropolyether oil represented by the following general formula:F(CFCFCFO)CF(where s=2-100), and a fluorine-containing di- or mono-amide-based compound, has further improved lubrication characteristics, particularly wear resistance and friction coefficient characteristics, of perfluoropolyether oil.