Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic nitrogen compound
Patent
1998-08-10
2000-05-23
Johnson, Jerry D.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic nitrogen compound
508563, 508584, C10M10504, C10M10102, C10M13304, C10M12910
Patent
active
060666048
ABSTRACT:
Disclosed is a vacuum pump oil, of which the base oil substantially comprises hydrocarbons having a molecular weight of not smaller than 300, and has a viscosity index of not smaller than 120 and a dynamic viscosity at 40.degree. C. of from 10 to 500 mm.sup.2 /sec. The vacuum pump oil has good thermal stability and good capabilities to produce high ultimate vacuum degrees and to facilitate low-temperature starting of pumps. Using this, vacuum pumps can be rapidly started and can reach the steady-state driving condition even in winter and in cold districts.
REFERENCES:
patent: 4317948 (1982-03-01), Heckelsberg
patent: 5372703 (1994-12-01), Kamiya et al.
Idemitsu Kosan Co. Ltd.
Johnson Jerry D.
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