Assignee
ESSEF CORP
US40 patents
Top patents by PatentIndex Score
US5096083AMar 17, 1992
Polyethylene shipping drum
ESSEF CORP71 citations96
US5819978AOct 13, 1998
Two piece composite inlet
ESSEF CORP60 citations95
US5568878AOct 29, 1996
Filament wound pressure vessel having a reinforced access opening
ESSEF CORP60 citations95
US5121852AJun 16, 1992
Dynamic pressure relief seal for pressure vessels
ESSEF CORP75 citations95
US6485668B1Nov 26, 2002
Method for fabricating composite pressure vessels and products fabricated by the method
ESSEF CORP68 citations93
US6190598B1Feb 20, 2001
Method for making thermoplastic composite pressure vessels
ESSEF CORP60 citations93
US5900107AMay 4, 1999
Fitting installation process and apparatus for a molded plastic vessel
ESSEF CORP73 citations92
US5878773AMar 9, 1999
Auxiliary flow path valve
ESSEF CORP24 citations92
US5866001AFeb 2, 1999
Filament wound housing for a reverse osmosis filter cartridge
ESSEF CORP21 citations92
US5526994AJun 18, 1996
Filament-wound isotensoid pressure vessels having geodesic domes
ESSEF CORP26 citations92
US5388720AFeb 14, 1995
Flanged diffuser and air cell retainer for pressure vessel
ESSEF CORP25 citations92
US5368073ANov 29, 1994
Hydropneumatic pressure vessel having an improved diaphragm assembly
ESSEF CORP49 citations92
US5268096ADec 7, 1993
Pool drain assembly
ESSEF CORP27 citations92
US5072851ADec 17, 1991
Dynamic pressure relief seal for pressure vessels
ESSEF CORP23 citations92
US4753726AJun 28, 1988
Distributor for filters
ESSEF CORP65 citations92
US4705468ANov 10, 1987
Apparatus for rotationally casting a plastic tank liner having an access fitting
ESSEF CORP35 citations92
US6565793B1May 20, 2003
Method for fabricating composite pressure vessels
ESSEF CORP20 citations90
US6171423B1Jan 9, 2001
Method for fabricating composite pressure vessels
ESSEF CORP43 citations90
US5556497ASep 17, 1996
Fitting installation process
ESSEF CORP24 citations89
US5045187ASep 3, 1991
Regeneration system for water conditioners such as water softeners
ESSEF CORP38 citations88
US5759414AJun 2, 1998
Swimming pool main drain assembly
ESSEF CORP34 citations86
US6793095B1Sep 21, 2004
Blow-molded pressure tank with spin-welded connector
ESSEF CORP59 citations85
US4637435AJan 20, 1987
Antiseal arrangement for hydropneumatic pressure tanks
ESSEF CORP32 citations84
US6660214B2Dec 9, 2003
Pressure vessel manufacture method
ESSEF CORP15 citations83
US6298553B1Oct 9, 2001
Composite pressure vessel with heat exchanger
ESSEF CORP16 citations83
US5759387AJun 2, 1998
Grey water filter tank recovery system and filter backwashing system
ESSEF CORP19 citations83
US5356589AOct 18, 1994
Method and apparatus for forming rotationally cast tank liner having an end fitting
ESSEF CORP41 citations81
US5545952AAug 13, 1996
Self grounding lamp for special use in an underwater environment
ESSEF CORP20 citations80
US4994132AFeb 19, 1991
Method and apparatus for attaching an insert in a hollow body
ESSEF CORP21 citations76
US5806705ASep 15, 1998
Sealing technique for hydropneumatic pressure vessel
ESSEF CORP17 citations75
USD309364SJul 17, 1990
Salvage drum
ESSEF CORP7 citations74
US5308386AMay 3, 1994
Air relief valve for a pressure vessel
ESSEF CORP17 citations73
USD297560SSep 6, 1988
Colloidalizing venturi valve
ESSEF CORP8 citations73
US5484079AJan 16, 1996
Hydropneumatic filament-wound pressure vessel
ESSEF CORP17 citations72
US6932391B2Aug 23, 2005
Quick-release fitting assembly
ESSEF CORP7 citations70
US7017771B1Mar 28, 2006
Pressure vessel
ESSEF CORP8 citations64
US7090736B2Aug 15, 2006
Pressure vessel prestressing technique
ESSEF CORP6 citations62
US5320495AJun 14, 1994
Pressure switch adaptor for well system
ESSEF CORP13 citations59
US5574334ANov 12, 1996
Submerged lamp with self grounding sleeve
ESSEF CORP0 citations52
US4778369AOct 18, 1988
Apparatus for changing vertical-axis extrusion dies
ESSEF CORP3 citations50