4. Seal for a joint or juncture
  5. Seal between relatively movable parts
  6. Piston ring or piston ring expander or seat therefor

Nobuo Katayama

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Spacer expander

Expansible chamber devices – Piston – Nonmetallic portion
Reexamination Certificate

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Two piece oil control ring with nitrided surface layers

Seal for a joint or juncture – Seal between relatively movable parts – Piston ring or piston ring expander or seat therefor
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2780106

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