US PATENT SUBCLASS 166 / 101
PACKER OR PLUG AND PUMP OR PLUNGER MEANS EXERTING OUTWARD PRESSURE


Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use



166 /   HD   WELLS

101PACKER OR PLUG AND PUMP OR PLUNGER MEANS EXERTING OUTWARD PRESSURE


DEFINITION

Classification: 166/101

(under subclass 179) Devices under the class definition comprising a packer or plug combined with a pump or plunger means for exerting outward fluid pressure against the wall of the surrounding conduit either in the space between a pair of packer or plug means or in the space beneath the packer or plug means.

(1) Note. The pump or plunger means must be some device other than a packer or plug which forms a seal with the surrounding conduit specified in the definition. See subclass 119 for devices which may create pressure by the relative movement of packer or plug sealing means.

(2) Note. Cementing and washing devices and other well devices commonly are associated with a pump (usually at the well top) for producing pressure beneath a packer. A mere broad or nominal reference to a pump means is therefore not sufficient for classification in this subclass. Such devices are classified in appropriate subclasses on other features.

(3) Note. The pump or plunger means must cause a direct outward fluid pressure. See subclass 106 for devices in which an eduction pump while withdrawing liquid may create a condition which causes outward pressure as defined in subclass 101.

SEE OR SEARCH THIS CLASS, SUBCLASS:

106, for a packer or plug and eduction pump means which may indirectly or incidentally cause pressure outwardly, while it pumps liquid out of the well. 177, for packers or plug devices reciprocated in a surrounding conduit to cause surging or outward pressure.