PARKSON CORPORATION
31Patents
20Active
31Granted
47Portfolio score
Filing activity: May 2, 1988 → Jan 25, 2021 · 7 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5015421A | Diffusion device | Emerging Cross-Sectional Technologies | 45 | Expired |
| US6426005B1 | Sequential descending bed filters with reject/washwater containing impurities being fed to a separate unit for elimination of impurities | Chemistry; Metallurgy | 32 | Expired |
| US6234323A | Header for a sludge removal system | Performing Operations; Transporting | 24 | Expired |
| US5639371A | Aeration reactor with flow control | Emerging Cross-Sectional Technologies | 20 | Expired |
| US6689277B2 | Treatment of liquids with ballasted flocculation | Chemistry; Metallurgy | 17 | Expired |
| US6517714B2 | Treatment of liquids with ballasted flocculation | Chemistry; Metallurgy | 17 | Expired |
| US5906774A | Submerged diffuser lifting arrangement | Emerging Cross-Sectional Technologies | 13 | Expired |
| US8945401B2 | Method and apparatus for separating solid impurities from a fluid | Performing Operations; Transporting | 13 | Active |
| US5192467A | Aeration panel structure | Performing Operations; Transporting | 10 | Expired |
| US5811011A | Biological treatment of wastewater | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4882068A | Method and apparatus for removing liquid from suspensions | Performing Operations; Transporting | 6 | Expired |
| US9656188B2 | Method and apparatus for separating solid impurities from a fluid | Performing Operations; Transporting | 5 | Active |
| US8636149B2 | Method and apparatus for washing sand | Performing Operations; Transporting | 5 | Active |
| US7699177B2 | Method and apparatus for washing sand | Performing Operations; Transporting | 4 | Active |
| US7806389B2 | Flexible aeration panel and methods of use | Emerging Cross-Sectional Technologies | 4 | Active |
| US8771521B2 | Method and computer program product for treating liquid containing impurities | Chemistry; Metallurgy | 4 | Active |
| US8658031B2 | Method and apparatus for treating liquid containing impurities | Chemistry; Metallurgy | 4 | Active |
| US6733670B2 | Apparatus and method for rehabilitating a traveling bridge filter underdrain | Performing Operations; Transporting | 3 | Expired |
| US8696896B2 | Apparatus for treating liquid containing impurities | Chemistry; Metallurgy | 3 | Active |
| US8025796B2 | Denitrification system | Chemistry; Metallurgy | 3 | Active |
| US7662287B2 | Wastewater denitrification system | Chemistry; Metallurgy | 3 | Active |
| US10376820B2 | Removing solids from a flowing fluid using a care-free pumped or gravity flow rotating drum screen with stationary stabilization assemblies | Performing Operations; Transporting | 2 | Active |
| US9616366B2 | Care-free pumped or gravity flow rotating drum screen with stationary stabilization pad assemblies | Performing Operations; Transporting | 2 | Active |
| US7431840B2 | Denitrification process | Chemistry; Metallurgy | 1 | Active |
| US11633680B2 | Bar screen filter apparatus and method | Chemistry; Metallurgy | 1 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.