.~ Non-metallic seal means between piston or member and end portion
DEFINITION
Classification: 92/168
(under subclass 165) Apparatus comprising a nonmetallic sealing element between the cylinder end portion and the piston or element moved by the piston.
SEE OR SEARCH CLASS
74, Machine Element or Mechanism,
18.2, for a flexible sealing element secured to a casing portion and to a reciprocating rod portion to prevent the seepage of fluid into or out of the casing. The mere nominal recitation of a cylinder and piston does not preclude classification in Class 74.
277, Seal for a Joint or Juncture, for a generic sealing means or process,
500+, for a dynamic, circumferential, contact seal for other than a piston.
