Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F16
ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
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F16J
PISTONS; CYLINDERS; SEALINGS
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9/00
Piston-rings; , e.g. non-metallic piston-rings; , seats therefor; Ring sealings of similar construction
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F16J9/20
Rings with special cross-section; Oil-scraping rings
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