US PATENT SUBCLASS 405 / 50
.~ Porous waterway, e.g., sand drain, etc.

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

Internet Version by PATENTEC © 1999      Terms of Use


405 /   HD   HYDRAULIC AND EARTH ENGINEERING

36  DF  DRAINAGE OR IRRIGATION {7}
50.~ Porous waterway, e.g., sand drain, etc.

DEFINITION

Classification: 405/50

Porous waterway, e.g., sand drain, etc.:

(under subclass 36) Method or apparatus wherein a highly water permeable material is placed in a less permeable earthen formation to allow water to be conducted within or through the formation.