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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F16J15/02
between relatively-stationary surfaces
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F16J15/022
characterised by structure or material
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F16J15/024
the packing being locally weakened in order to increase elasticity
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F16J15/027
and with a hollow profile
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