==Major Companies==
===Top Patent Holders in Nanofiltration for Water Purification===
The following chart shows the major companies in the Nanofiltration technology by the number of patents they hold in this segment.
[[Image:top patent holders in Nanofiltration chart.png|center|thumb|817px]]
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===Other Companies===
The following table contains a list of other companies in the field of nanofiltration in water purification:
{|border="2" cellspacing="0" cellpadding="4" width="100%" align="center"
|bgcolor = "#DCE6F1"|3m Corp
|bgcolor = "#DCE6F1"|Halox Technologies
|bgcolor = "#DCE6F1"|Osmoflo Pty Ltd
|bgcolor = "#DCE6F1"|Surrey Aqua Technology Limited
|-
|Akzo Nobel Nv
|Hollingsworth & Vose Gmbh
|Paragon Water Systems
|Tata Chemicals Ltd
|-
|bgcolor = "#DCE6F1"|Aquasource
|bgcolor = "#DCE6F1"|Honeywell International Inc
|bgcolor = "#DCE6F1"|Prominent Dosiertechnik Gmbh
|bgcolor = "#DCE6F1"|Technion Research And Development Foundation Ltd.
|-
|Cognis Deutschland Gmbh & Co Kg
|Inframat Corp
|Saati
|The Dow Chemical Company
|-
|bgcolor = "#DCE6F1"|Creative Micro Tech
|bgcolor = "#DCE6F1"|International Business Machines Corp
|bgcolor = "#DCE6F1"|Saline Water Conversion Corporation
|bgcolor = "#DCE6F1"|The Purolite Company
|-
|Donaldson Co Inc
|Itn Nanovation Ag
|Samsung
|Veolia Environnement
|-
|bgcolor = "#DCE6F1"|Dual Vortex Microfiltration
|bgcolor = "#DCE6F1"|Metso Oy
|bgcolor = "#DCE6F1"|Sgl Group
|bgcolor = "#DCE6F1"|Veolia Group
|-
|Ecolochem
|Millipore Corporation
|Solvay Sa
|Zenon Environmental Inc
|-
|bgcolor = "#DCE6F1"|Fleetguard
|bgcolor = "#DCE6F1"|Mitsubishi Corporation
|bgcolor = "#DCE6F1" colspan = "2"|Stichting Wetsus Centre Of Excellence For Sustainable Water Technology
|-
|Hager Elsaesser
|Norit Proces Technologie Holding Bv
|colspan = "2"|Sumitomo Group
|-
|}<br clear="all">
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