(under the class definition) Devices combined with a pump or plunger means for drawing well fluid out of the well or into a receptacle which is to be taken out of the well.
(1) Note. See the class definition of Class 166 for the line with Class 417, Pumps.
(2) Note. Well devices such as sampling or cementing means frequently are provided with means for circulating liquids (e.g., introducing a liquid to drive out a liquid). Such liquid circulating means are not considered pumps for this subclass. These devices are classified on other features, mainly, the arrangement of valves and packers as in subclasses 142+.
(3) Note. Claims involving merely a pump or pump tubing carrying an expanding support in a well conduit, or a packer or plug structure for a pump and claiming the pump by name only or as a pump barrel are classified on the basis of the supporting or packing structure rather than in this or indented subclasses, the pump or pump barrel being treated as a mere pipe or central conduit, according to the disclosure.
SEE OR SEARCH THIS CLASS, SUBCLASS:
61, and 62, for heating, refrigerating or insulating means with an eduction pump or plunger in the well. 68, for above and below ground structure including an eduction pump or plunger in the well.
176, for brushing, scraping, cutting or punching type cleaners on a pump sucker or rod.
206+, for expansible anchor means on a pump tubing.
SEE OR SEARCH CLASS
137, Fluid Handling,
155, for gas lift valves for wells and subclass 206 for apparatus for gas displacements of a liquid.
175, Boring or Penetrating the Earth,
324, for earth boring apparatus having a tool shaft with means other than bit structure to induce fluent flow.
267, Spring Devices,
125, for a piston-type fluid spring device useful in apparatus for drawing fluid from a well.
