- Air Maze
- Air Sentry
- Allen
- Alsop
- Ambac
- American Air Filter
- American Felt & Filter
- Ametek
- Army-Navy
- Arrow
- Arion Farr
- Atico
- Atlas Copco
- Baldwin
- Balston
- Banner
- Bauer Bendix
- Bowser
- Briggs
- Busch
- Cambridge
- Can-Flo
- Caterpillar
- Char
- Cim-Tek
- Commercial
- Compair Kellogg
- Consler
- Cross
- Cuno
- Daboco
- Dahl
- DeLava
- Des-Case
- Delta-Pure
- Deltech
- Dollinger
- Domnick Hunter
- Donaldson
- EDM
- Eldorado Tool
- Endustra
- Everpure
- Facet
- Fairey
- Filterite
- Filtersorb
- Filtration Systems
- Filtrec
- Filtroil
- Fine-Aire
- Finite
| - Filtrona
- Fleetguard
- FlowEzy
- Fluitek
- Fram
- Frick Fulflo
- Gardner Denver
- GE Gellman
- General
- Glasfloss
- Graver
- Gresen
- Hankison
- Harmsco
- Hayward
- Hilco
- Hilliard
- Hoffman
- HR Textron
- Hunter
- Hycon Hydac
- Hyde
- Hytrex
- IFM Ingersoll
- Internormen
- John Deere
- Joy
- Kaydon
- Keene
- Keltec-Technolab
- Knight
- Lenz
- LeRoi
- LHA
- Luber Finer
- Lynn
- Mahle
- Mann
- Marvel
- MYCOM
- Membrane
- Microfiltrex
- Moog
- NAFCO
- National Filter Media
- Nelson
- Norgren
- Norman
- Nuclepore
- Nugent
- Osmonics
- Pall
- Parker
| - Peco
- Pentair
- Pioneer
- Plymouth Products
- Porous Media
- PTI
- Purolator
- Quantek
- Quincy
- Racine
- Racor
- Rand
- Refilco
- Research Products
- Rietschle
- Rosaen
- Rosedale
- Royal Filter
- Sartorius
- Schroeder
- Sefar
- Selex
- Separation Technologies
- Serfilco
- Sethco
- Snow Filtration
- Solberg
- Sparks
- Strainrite
- Sullair
- Summit Industrial
- Textron
- Torit
- UAS
- UCC
- UniversalFilters
- Ultrafilter
- Universal Silencer
- Van Air
- Velcon
- Vickers
- WesternFilter
- Whatman/Nuclepore
- Wilkerson
- Wix
- Yardney
- York
- Zander
- Zeks
- Zinga
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