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(11)    Patent No :    AP 2095   
(21)    Application No :    AP/P/2006/003634   
(22)    Filing Date :    15.11.2004   
(24)    Date of Grant &    29.01.2010   
(45)    Publication :

(30)  Priority Data       
(33) Country    (31) Number    (32) Date
US    60/519,887    14.11.2003

(84)    Designated State

BW    GM    GH    KE    LS    MW  MZ   NA   SL
SD    SZ    T Z    UG    ZM    ZW

(73) Applicant(s)


Francisco, CA 94109,
United States of America

(72) Inventors

FISHER Martin J, United States of America

CARLSON Lawrence E, United States of America

TARBELL Ben, United States of America

et al

(74) Representative


(51)  International  Classification   F04B47/02 (2006.06)    F04B53/12 (2006.01)

(54)    Title

Deep well irrigation pump

(57)    Abstract

Provided herein are exemplary embodiments of an efficient pump apparatus. In one embodiment the pump apparatus comprises a piston assembly loosely disposed within a cylinder. The piston assembly includes a driving cable connecting a top leaky piston and a bottom leaky piston having a check valve connected thereto. The cylinder includes an outlet pipe at an upper portion thereof and a check valve located at a lower end of the cylinder The pistons move in the cylinder at a velocity relative to the conduit such that as the pistons move along the cylinder they create a substantial tortuous leak path forming a hydrodynamic seal between the pistons and the cylinder.

(56)    Documents Cit ed :    US 909 676 A    US 1 012 917 A    US 767 092 A    US 724 569 A


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