ESSEF Corporation
41Patents
0Active
41Granted
37Portfolio score
Filing activity: Aug 8, 1985 → Feb 20, 2003
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6793095B1 | Blow-molded pressure tank with spin-welded connector | Emerging Cross-Sectional Technologies | 45 | Expired |
| US5900107A | Fitting installation process and apparatus for a molded plastic vessel | Emerging Cross-Sectional Technologies | 44 | Expired |
| US5096083A | Polyethylene shipping drum | Performing Operations; Transporting | 42 | Expired |
| US4753726A | Distributor for filters | Performing Operations; Transporting | 41 | Expired |
| US5121852A | Dynamic pressure relief seal for pressure vessels | Performing Operations; Transporting | 37 | Expired |
| US6485668B1 | Method for fabricating composite pressure vessels and products fabricated by the method | Performing Operations; Transporting | 34 | Expired |
| US5819978A | Two piece composite inlet | Emerging Cross-Sectional Technologies | 29 | Expired |
| US5759414A | Swimming pool main drain assembly | Fixed Constructions | 29 | Expired |
| US5368073A | Hydropneumatic pressure vessel having an improved diaphragm assembly | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US6190598A | Method for making thermoplastic composite pressure vessels | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5568878A | Filament wound pressure vessel having a reinforced access opening | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US5356589A | Method and apparatus for forming rotationally cast tank liner having an end fitting | Performing Operations; Transporting | 24 | Expired |
| US4705468A | Apparatus for rotationally casting a plastic tank liner having an access fitting | Performing Operations; Transporting | 22 | Expired |
| US6171423A | Method for fabricating composite pressure vessels | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US5268096A | Pool drain assembly | Fixed Constructions | 21 | Expired |
| US4637435A | Antiseal arrangement for hydropneumatic pressure tanks | Mechanical Engineering; Lighting; Heating | 20 | Expired |
| US5045187A | Regeneration system for water conditioners such as water softeners | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4944887A | Regenerative diatomaceous earth filter | Performing Operations; Transporting | 19 | Expired |
| US5072851A | Dynamic pressure relief seal for pressure vessels | Performing Operations; Transporting | 16 | Expired |
| US5526994A | Filament-wound isotensoid pressure vessels having geodesic domes | Mechanical Engineering; Lighting; Heating | 16 | Expired |
| US5556497A | Fitting installation process | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4994132A | Method and apparatus for attaching an insert in a hollow body | Performing Operations; Transporting | 15 | Expired |
| US5878773A | Auxiliary flow path valve | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5388720A | Flanged diffuser and air cell retainer for pressure vessel | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US5484079A | Hydropneumatic filament-wound pressure vessel | Mechanical Engineering; Lighting; Heating | 12 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.