US PATENT SUBCLASS 166 / 203
.~ Non-deformable type
Current as of: June, 1999
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DEFINITION
Classification: 166/203
(under subclass 179) Devices comprising nondeformable portions (e.g., a hard metal) forming the blocking means between the inner supporting member and the outer conduit.
(1) Note. Casing shoes or the like are classified in this subclass if the blocking or sealing function of the shoe is disclosed and this function or the structure performing the function is claimed.
SEE OR SEARCH THIS CLASS, SUBCLASS:
161, for casing shoes with cutting, scraping or reaming means.
192+, for nondeformable plugs.
204, for metallic rings used to prevent extrusion of a deformable sealing portion of a packer or plug, such rings forming a secondary blocking means.
