US PATENT SUBCLASS 166 / 202
.~ Cup type
Current as of: June, 1999
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DEFINITION
Classification: 166/202
(under subclass 179) Devices in which the laterally expansible blocking portion of the device has one end thereof attached to and adjacent to a central pipe support and the other longitudinally displaced end portion spaced from the support axis and in which the blocking portion is flexible or hinged to the support whereby the fluid pressure of the fluid, the flow of which is being stopped, tends to cause the spaced end portion to engage the enclosing conduit more tightly.
SEE OR SEARCH THIS CLASS, SUBCLASS:
121, for cup type packer seals which transmit fluid pressure to move expanding anchors to set position.
153+, for pistons, fluid driven into the well with cup type seals.
199, and 201, for packers in which sleeve or shoulder parts spread one end of a deformable sealing portion.
SEE OR SEARCH CLASS
92, Expansible Chamber Devices, 172+, and particularly subclasses 240+ for a piston in which the side wall portion thereof is provided with a peripheral axially extending flexible lip (e.g., cup type).
277, Joint Packing, for packing which establishes a tight seal. The metal cement baskets found in this subclass (202) are not considered to form tight seals for Class 277.
417, Pumps,
545+, for valved pistons including valved well swabs.
