E03B3/20 - CPC Classification Index

ClassID:

129160 ⎘

E03B3/20 - CPC Classification

Classification description:

Methods or installations for obtaining or collecting drinking water or tap water from underground; Obtaining and confining water by means of wells; Component parts of wells; Well filters of elements of special shape

Sub-classes:

E03B3/22 » Selection of specified materials 0

Recent Application in this class:

20150129199

2015-05-14

Nano-particle reinforced well screen

20150108053

2015-04-23

Water purification and storage system, water-filtering well and polygonal building block

20120048536

2012-03-01

Sand control screen assembly having integral connector rings and method for making same

20100300986

2010-12-02

WELL FILTER

20100065270

2010-03-18

Filtering device, especially for use as a well screen filter